An engineer is building a model of SheiKra which is 200 feet high and wants the model to be about 32 inches high. To find the appropriate scale for the model, we can use the following formula:
Scale = (model height/actual height) x 12We know that the actual height of SheiKra is 200 feet, and the engineer wants the model to be 32 inches high. Therefore, the scale for the model is:
Scale = (32/200) x 12 = 1.92We can round this to the nearest whole number, which gives us a scale of 2.The loop height of the model can be found by multiplying the actual loop height by the scale.
The actual loop height of SheiKra is approximately 138 feet. Therefore, the loop height of the model is:Loop height = 138 x 2 = 276 inches or 23 feet.
This means that the engineer needs to make the loop of the model approximately 23 feet high to maintain the scale of the model.
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Two airplanes leave the airport at the same time. Thirty minutes later, they are 250 miles apart. If one plane traveled 230 miles and the other plane traveled 315 miles during that time, find the angle θ between their flight paths. Show all work clearly and neatly. Round to the nearest tenth.
To answer this question, we can use the Cosine Law. We have that the general formula for it is as follows:
\(c^2=a^2+b^2-2ab\cos C\)We need to remember that angle C is the angle in front of the side c. Then we have - from the graph:
• c = 250mi
,• a = 230mi
,• b = 315mi
And we will find the angle Θ as follows - without using units:
\(250^2=230^2+315^2-2(230)(315)\cos \theta\)Then, if we solve the equation for cosΘ, we will have:
\(62500=52900+99225-144900\cos \theta\)\(62500=152125-144900\cos \theta\)Then, we have:
\(62500-152125=-144900\cos \theta\)\(-\frac{89625}{-144900}=\cos \theta\Rightarrow\cos \theta=0.618530020704\)If we need to find the angle, Θ, we need to apply the inverse function of cosine, arccosine, to both sides of the equation to find it. Then, we have:
\(\arccos (\cos \theta)=\arccos (0.618530020704)\)Then
\(\theta=51.7911319179^{\circ}\)If we round the value to the nearest tenth, then we have that:
\(\theta=51.8^{\circ}\)In summary, therefore, the angle Θ between their flights paths is Θ = 51.8º - rounded to the nearest tenth.
New game You pay 10 and roll a 6 die. If you get a you win 50 If not, you get to roll again. If you get a 6 this time, you get your 10 back.a) Create a probability model for this game.b) Find the expected value and standard deviation of your prospective winnings.c) You play this game five times. Find the expected value and standard deviation of your average winnings.d) 100 people play this game. What's the probability the person running the game makes a profit?
The probability mode for the given value is created. The expected value and standard deviation of prospective winnings are -$0.28 and $18.33. The expected value and standard deviation if the game is played five times are -$1.40 and $40.99. The probability that the person running the game makes a profit is 0.561.
Probability is a way to determine how likely something is to happen. It is computed by dividing the frequency of the event by the total number of outcomes. The formula then becomes P(X) = frequency of the event÷total number of outcomes.
The product of the probabilities determines the likelihood that two or more occurrences will coincide. This is given by, P(A and B) = P(A)P(B).
a) To create a probability model follow the steps. Let X is an occurrence of an event. The table is attached here.
b) The expected value is calculated using the formula, E(X) = μ = ∑ x P(x).
\(\begin{aligned}E(X)=\mu&=x_1p_1+x_2p_2+x_3p_3\\&=40\left(\frac{1}{6}\right)+0\left(\frac{5}{36}\right)+(-10)\left(\frac{25}{36}\right)\\&=-\$ 0.28\end{aligned}\)
Also,
\(\begin{aligned}E(X^2)&={x_1}^{2}p_{1}+{x_2}^{2}p_{2}+{x_3}^{2}p_{3}\\&=(40)^2\frac{1}{6}+(0)\frac{5}{36}+(-10)^2\frac{25}{36}\\&=(1600)\frac{1}{6}+(0)\frac{5}{36}+(100)\frac{25}{36}\\&=266.67+69.44\\&=336.11\end{aligned}\)
And the standard deviation is calculated using the formula, σ=√Var[X].
\(\begin{aligned}\sigma=\sqrt{\text{Var}(X)}&=\sqrt{E(X^2)-E(X)^2}\\&=\sqrt{336.11-0.08}\\&=\sqrt{336.03}\\&=\$18.33\end{aligned}\)
c) The expected value and standard deviation for playing the game 5 times are calculated as follows.
The expected value is,
\(\begin{aligned}5\times E(X)&=5(-\$0.28)\\&=-\$1.40\\\end{aligned}\)
The standard deviation is,
\(\begin{aligned}\sigma&=\sqrt{5\times\tex{Var}(X)\\&=\sqrt{5\times336.03\\&=\sqrt{1680.15}\\&=\$40.99\end{aligned}\)
d) The dice rolling is random and the winning chance is independent. The probability the person running the game makes a profit (P(x<0)) is given by,
The population mean, μ(Y) = -$0.28
The standard deviation for a population of 100 is,
\(\begin{aligned}\sigma&=\sqrt{\frac{\text{Var}(X)}{n}}\\&=\frac{18.33}{\sqrt{100}}\\&=1.83\end{aligned}\)
The z-score for mean winning is,
\(\begin{aligned}z&=\frac{x-\mu}{\sigma}\\&=\frac{0-(-0.28)}{1.83}\\&=0.153\end{aligned}\)
For a person to make a profit, the mean winning of the player should be less than the z-score. Then,
The P-value from the z-table, P(z<0.153)=0.5608
The answer is 0.561.
The complete question is -
You pay $10 and roll a die. If you get a 6, you win$50. If not, you get to roll again. If you get a 6 this time, you get your $10 back. a) Create a probability model for this game. b) Find the expected value and standard deviation of your prospective winnings. c) You play this game five times. Find the expected value and standard deviation of your average winnings. d) 100 people play this game. What’s the probability the person running the game makes a profit?
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Find the solution of the system of equations. -4x - y = -28
x+y=4
The solutions of the system of equations are 8 and -4.
What is an equation?An equation is a mathematical statement that is made up of two expressions connected by an equal sign.
Example:
2x + 4 = 9 is an equation.
We have,
-4x - y = -28 _____(1)
x + y = 4 _____(2)
x = 4 - y _____(3)
Substituting (3) in (1) we get,
-4(4 - y) - y = -28
-16 + 4y - y = -28
-16 + 3y = -28
3y = -28 + 16
3y = -12
y = -4
Substituting y = -4 in (3) we get,
x = 4 - (-4)
x = 4 + 4
x = 8
Thus,
The value of x is 8.
The value of y is -4.
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Given the given cost function
C(2) = 4350 + 270x + 0.2x^2 and the demand function p(x) = 810.
Find the production level that will maximize profit.
The production level that will maximize profit is 1350.
How to determine the production level that will maximize profitTo find the production level that will maximize profit, we need to first calculate the revenue function using the demand function.
The revenue function is given by:
R(x) = p(x) * x
Substituting the given demand function p(x) = 810, we get:
R(x) = 810x
The profit function is given by subtracting the cost function from the revenue function: P(x) = R(x) - C(x)
Substituting the given cost function C(x) = 4350 + 270x + 0.2x^2, and the revenue function R(x) = 810x, we get:
P(x) = 810x - (4350 + 270x + 0.2x^2)
Simplifying this expression, we get:
P(x) = -0.2x^2 + 540x - 4350
To maximize profit, we need to find the production level that corresponds to the maximum value of the profit function.
This can be done by finding the x-value at which the derivative of the profit function is equal to zero:
P'(x) = -0.4x + 540
Setting this expression equal to zero, we get:
-0.4x + 540 = 0
Solving for x, we get:
x = 1350
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if p = 2^k + 1 is prime, show that every quadratic nonresidue of p is a primitive root of p.
Every quadratic nonresidue of p is a primitive root of p, when p = 2^k + 1 is primeIf p = 2^k + 1 is a prime number, we want to show that every quadratic nonresidue of p is a primitive root of p.
In other words, we aim to prove that if an element x is a quadratic nonresidue modulo p, then it is also a primitive root of p.
Let's assume p = 2^k + 1 is a prime number. To prove that every quadratic nonresidue of p is a primitive root of p, we can use the properties of quadratic residues and quadratic nonresidues.
A quadratic residue modulo p is an element y such that y^((p-1)/2) ≡ 1 (mod p), while a quadratic nonresidue is an element x such that x^((p-1)/2) ≡ -1 (mod p).
Now, let's consider an element x that is a quadratic nonresidue modulo p. We want to show that x is a primitive root of p.
Since x is a quadratic nonresidue, we know that x^((p-1)/2) ≡ -1 (mod p). By Euler's criterion, this implies that x^((p-1)/2) ≡ -1^((p-1)/2) ≡ -1^2 ≡ 1 (mod p).
Since x^((p-1)/2) ≡ 1 (mod p), we can conclude that the order of x modulo p is at least (p-1)/2. However, since p = 2^k + 1 is a prime, the order of x modulo p must be equal to (p-1)/2.
By definition, a primitive root of p has an order of (p-1). Since the order of x modulo p is (p-1)/2, it follows that x is a primitive root of p.
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A mathematician develops a program to solve systems of linear equations. When they use distributed computing techniques to run the program on two computers in parallel, they find a speedup of 2. In this case, what does a speedup of 2 indicate
A speedup of 2 suggests that the program is efficiently utilizing the additional computational resources provided by the second computer, resulting in a significant reduction in computation time.
A speedup of 2 indicates that the program running on two computers in parallel is approximately twice as fast as running it on a single computer. In other words, the distributed computing techniques and parallel processing allow the mathematician to solve the systems of linear equations in half the time compared to running the program on a single computer.
Speedup is a measure of the improvement achieved by using parallel computing techniques. It quantifies the ratio of the time required to execute a task sequentially (on a single computer) to the time required to execute the same task in parallel (using multiple computers). A speedup of 2 suggests that the program is efficiently utilizing the additional computational resources provided by the second computer, resulting in a significant reduction in computation time.
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Find the sum of the convergent series. n = 0
∑ (1/4)^n
The sum of the given convergent series is 4/3.
How to determined the sum of convergent series?The given series is a geometric series with the first term (a) equal to 1 and the common ratio (r) equal to 1/4.
The formula for the sum of a geometric series is:
S = a(1 - rⁿ)/(1 - r)
where S is the sum of the series, a is the first term,
r is the common-ratio, and n is the number of terms in the series.
Substituting the given values in the formula, we get:
S = 1(1 - (1/4)ⁿ)/(1 - 1/4)S = 4/3(1 - (1/4)ⁿ)Since the series is convergent, the limit of the series as n approaches infinity is a finite number.
As n approaches infinity, (1/4)ⁿ approaches zero, so we have:
S = 4/3(1 - 0)S = 4/3Therefore, the sum of the given convergent series is 4/3.
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Your roommate Venmo's you $604 for rent and utilities. You need to instant transfer said amount. Knowing that the instant transfer fee
is 1.75%, how much will actually be transfered to your account?
O $587.56
O $593.43
O $599.97
O $604
20 is what percent of 80? Choose the equation to solve the problem
a. 20 = 80% ∙ x; 25%
b. 80 = 20% ∙ x; 400%
c. 20 = x ∙ 80; 25%
d. x = 20% ∙ 80; 0.25%
Answer:
A
Step-by-step explanation:
CAN SOMEONE HELP ME!!!!!!!!!!!!!!!
Answer: 150 min
Step-by-step explanation:
2 hours = 120 min, 120 + 30 min = 150 min
Answer:
150 min
Work:
2 hours = 120 min, 120 + 30 min = 150 min
1. five friends go to the movie theater together. (a) if there are 5 seats open in a row, how many ways can the friends choose seats? (b) if there are 7 seats open in a row, how many ways can the friends choose seats? (note that two seats will remain empty.) (c) repeat part (b), but where two of the friends are required to sit next to each other. (d) repeat part (b), but where two of the friends are required to not sit next to each other.
he number of ways the friends can choose seats without sitting next to each other is 7! - 4! = 5040
If there are 5 seats open in a row and no restrictions on the seating arrangement, each friend can choose one seat independently. Therefore, the total number of ways the friends can choose seats is 5 factorial (5!) which is equal to 5 × 4 × 3 × 2 × 1 = 120.
(b) If there are 7 seats open in a row and no restrictions on the seating arrangement, each friend can choose one seat independently. Therefore, the total number of ways the friends can choose seats is 7 factorial (7!) which is equal to 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040.
(c) If two friends are required to sit next to each other, we can treat them as a single entity. This reduces the problem to arranging four entities (three individual friends and one pair of friends) and three empty seats. The total number of ways the friends can choose seats is then 4 factorial (4!) which is equal to 4 × 3 × 2 × 1 = 24.
(d) If two friends are required to not sit next to each other, we can count the complement of the situation in part (c). There are 7 factorial (7!) total seating arrangements without any restrictions. From part (c), we found that there are 4 factorial (4!) seating arrangements where the two friends sit next to each other. - 24 = 5016.
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2 (MC) Explain how the Quotient of Powers was used to simplify this expression. (2 points) 25 = 22 By finding the quotient of the bases to be 1 4 and cancelling common factors F O By finding the quotient of the bases to be 1 4 and simplifying the expression O By simplifying 8 to 23 to make both powers base two, and subtracting the exponents O By simplifying 8 to 23 to make both powers base two, and adding the exponents 3.(MC)
Answer:
Explain how the Quotient of Powers was used to simplify this expression. (2 points) 25 = 22 By finding the quotient of the bases to be 1 4 and cancelling common factors F O
Step-by-step explanation:
By finding the quotient of the bases to be 1 4 and simplifying the expression O By simplifying 8 to 23 to make both powers base two, and subtracting the exponents O By simplifying 8 to 23 to make both powers base two, and adding the exponents 3.(MC)
PLEASE ANSWER QUICKLY ASAP
READ THE QUESTIONS CAREFULLY
Answer:
I hope it helps.
The solutions in photo ^_^
variables that indicate the distance a target is from the level achieved are called
Variables that indicate the distance a target is from the level achieved are called performance metrics or progress indicators.
Variables that indicate the distance a target is from the level achieved are called performance metrics or progress indicators. These variables help measure and track progress towards a goal by providing a quantitative or qualitative measure of how far the target is from the desired level of achievement.
Performance metrics can be represented in various forms, such as distance covered, percentage completed, points earned, or even subjective evaluations. For example, in a fitness program, a performance metric could be the number of miles run or the number of push-ups completed.
These metrics enable individuals or organizations to assess their progress and make necessary adjustments to reach their desired outcomes.
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please help this is my last equation on my assignment and its due at 5... -1.2x = 12
The perimeter of a rectangle is 112 cm and its 10. A group
The tota
breadth is x cm.
(i) Find, in terms of x, an expression for the
length of the rectangle.
(ii) Given that the area of the rectangle is 597 cm²,
formulate an equation in x and show that it
reduces to x²-56x +597 = 0.
(iii) Solve the equation x²-56x + 597 = 0, giving
both answers correct to 2 decimal places.
(iv) Hence, find the length of the diagonal of
the rectangle.
Therefore, the length of the diagonal of the rectangle is approximately 193.57 cm or 49.43 cm, depending on which value of x is used.
What is perimeter?Perimeter is the total distance around the edge of a two-dimensional shape. It is the sum of the lengths of all the sides of the shape. For example, the perimeter of a rectangle is found by adding the lengths of its four sides.
Here,
(i) Let the length of the rectangle be y cm.
Then, the perimeter of the rectangle is given by:
2(x + y) = 112
x + y = 56
y = 56 - x
(ii) The area of the rectangle is given by:
Area = length x breadth
597 = yx
Substituting y = 56 - x, we get:
597 = x(56 - x)
597 = 56x - x²
x² - 56x + 597 = 0
(iii) Using the quadratic formula,
x = (-(-56) ± √((-56)² - 4(1)(597))) / (2(1))
x = (56 ± √(3136 - 2388)) / 2
x = (56 ± √(748)) / 2
x = (56 ± 2√(187)) / 2
x = 28 ± √(187)
Therefore, the two solutions are x = 28 + √(187) and x = 28 - √(187).
(iv) The length of the rectangle is y = 56 - x.
Using Pythagoras theorem, the length of the diagonal of the rectangle is given by:
d² = y² + x²
d² = (56 - x)² + x²
d² = 3136 - 112x + 2x²
d = √(3136 - 112x + 2x²)
Substituting the value of x from part (iii) into the above equation, we get:
d = √(3136 - 112(28 ± √(187)) + 2(28 ± √(187))²)
d = √(3136 - 3136 ± 112√(187) + 56 ± 56√(187) + 2(187))
d = √(37400 ± 168√(187))
d ≈ 193.57 cm (rounded to 2 decimal places) or d ≈ 49.43 cm (rounded to 2 decimal places)
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A survey was given to a random sample of 400 residents of a town to determine whether they support a new plan to raise taxes in order to increase education spending. Of those surveyed, 168 respondents said they were in favor of the plan. Determine a 95% confidence interval for the proportion of people who favor the tax plan, rounding values to the nearest thousandth.
Which types of triangles can always be used as a counterexample to the statement "all angles in a triangle are acute"? Select all that apply
equilateral
obtuse
acute
isosceles
scalene
right
Which types of triangles can always be used as a counterexample to the statement "all angles in a triangle are acute" they include
obtuseisoscelesscalenerightWhat is acute angle?Acute angles are those that are smaller than 90 degrees. 90 degrees is the angle at a right angle.
Obtuse angles are those that are more than 90 degrees.
A right triangle can be isosceles or scalene, meaning that each of its three sides is of a different length (having exactly two sides of equal length).
Equilateral triangle always have angel 60 degrees which as an acute angel
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I need help on the picture I sent
The length of the hypotenuse is as:
a. 25 inches
b. 10.30 m
c. 26 feet
d. 12.65 cm
e. 50 mm
f. 2.24 mile
What is the Formula for a Right-Angled Triangle?The Pythagoras formula is used to calculate the area of a right-angled triangle. It asserts that the hypotenuse's square is equal to the sum of its other two sides' squares. (Hypotenuse)² = (Base)² + (perpendicular)² is the Pythagorean formula.
a.
hypotenuses² = perpendicular² + base²
hypotenuses² = (7)² + (24)²
hypotenuses² = 625
hypotenuses = 25 inches
b.
hypotenuses² = perpendicular² + base²
hypotenuses² = (5)² + (9)²
hypotenuses² = 106
hypotenuses = 10.30 m
c.
hypotenuses² = perpendicular² + base²
hypotenuses² = (10)² + (24)²
hypotenuses² = 676
hypotenuses = 26 feet
d.
hypotenuses² = perpendicular² + base²
hypotenuses² = (4)² + (12)²
hypotenuses² = 160
hypotenuses = 12.65 cm
e.
hypotenuses² = perpendicular² + base²
hypotenuses² = (30)² + (40)²
hypotenuses² = 2500
hypotenuses = 50 mm
f.
hypotenuses² = perpendicular² + base²
hypotenuses² = (1)² + (2)²
hypotenuses² = 5
hypotenuses = 2.24 mile
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if 8 identical blackboards are to be divided among 4 schools, how many divisions are possible? reddit
There are 70 possible divisions of 8 identical blackboards among 4 schools.
The number of divisions of 8 identical blackboards among 4 schools can be calculated using a combination formula. In this case, each school can receive 0, 1, 2, 3, or 4 blackboards, so we can use the combination formula to find the number of ways to divide 8 blackboards among 4 schools:
C(n, k) = n! / (k! (n-k)!)
where n is the number of items to choose from (8 blackboards), k is the number of items to choose (4 schools), and ! denotes the factorial symbol.
Plugging in the values, we get:
C(8, 4) = 8! / (4! (8-4)!) = 70
So, there are 70 possible divisions of 8 identical blackboards among 4 schools.
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A recipe for homemade modeling clay includes cup of salt for every cup of water. If there are 6 cups of salt, how many gallons of water are needed?
Answer:
0.375
Step-by-step explanation:
see above
Find the volume of the solid of revolution generated by revolving about the x-axis the region under the following curve. y= x from x=0 to x=20 (The solid generated is called a paraboloid.) The volume is (Type an exact answer in terms of n.)
To start, let's sketch the graph of the curve y = x from x = 0 to x = 20. This is simply a diagonal line that passes through the points (0,0) and (20,20), as shown below:
```
|
20 | *
| *
| *
| *
|*
0 --------------
0 10 20
```
Now, we want to revolve this curve around the x-axis to create a solid shape. Specifically, we want to create a paraboloid, which is a three-dimensional shape that looks like an upside-down bowl.
To find the volume of this paraboloid, we need to use calculus. The basic idea is to slice the solid into very thin disks, and then add up the volumes of all the disks to get the total volume.
To do this, we'll use the formula for the volume of a cylinder, which is:
V = πr^2h
where r is the radius of the cylinder and h is its height. In our case, each disk is a cylinder with radius r and height h, where:
- r is equal to the y-value of the curve (i.e. r = y = x), since the disk extends from the x-axis to the curve.
- h is the thickness of the disk, which is a very small change in x. We can call this dx.
So, the volume of each disk is:
dV = πr^2dx
= πx^2dx
To find the total volume of the paraboloid, we need to add up the volumes of all the disks. This is done using an integral:
V = ∫(from x=0 to x=20) dV
= ∫(from x=0 to x=20) πx^2dx
Evaluating this integral gives us:
V = π/3 * 20^3
= 8000π/3
So the exact volume of the paraboloid is 8000π/3.
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PLS HELP TON OF POINTS AND BRAINLIEST
Answer:
sss axiom
Step-by-step explanation:
Answer:
wa pow
Step-by-step explanation:
4 A home-decorating company is determining the amount of fabric required for a customer's window treatments. A single window requires 13 yards and a double 7 window requires 16, yards of fabric. If there are two single windows and one double window, how much fabric is required?
The solution will be that the home-decorating company will require 42 yards of fabric for the customer's window treatments.
As per the information we have received from the question,
A single window requires 13 yards and a double window requires 16 yards of fabric. We are asked to find out the length of fabric that will be required by the home-decorating company, in case there were 2 single windows and 1 double window. The total amount of fabric that will be required by the home-decorating company is hence equal to
13×(no of single windows)+ 16×(no of double windows)
Here, no of single windows= 2
And, no of double window= 1
Hence, total fabric length=13×2 + 16×1=26 + 16=42 yards
Hence the solution is 42 yards of fabric.
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How many toys would Louis build in 10 hours if she built 3 toys every 20 minutes?
Answer:
90 toys
Step-by-step explanation:
We should use the same unit for time. Rewrite 20 minutes as 1/3 hour.
The unit rate is then:
3 toys 9 toys
----------------- = -----------
1/3 hour hour
Multiply this unit rate by 10 hours, obtaining 90 toys
A dart is thrown upward with an initial velocity of 63 ft/s at an angle of elevation of 55°. Consider the position of the dart at any time t. Neglect air resistance. (Assume t is in seconds. Round your answer to one decimal place.)
The position of the dart at any time t is: y(t) = -16t^2 + 51. At any time t, the position of the dart can be determined using the following formula:
where v is the initial velocity in the vertical direction, y0 is the initial elevation, and -16 is the acceleration due to gravity in ft/s^2.
y(t) = -16t^2 + vt + y0
Using the given values, we have:
v = 63 ft/s * sin(55°) ≈ 51.1 ft/s (velocity in the vertical direction)
y0 = 0 ft (initial elevation)
Thus, the position of the dart at any time t is:
y(t) = -16t^2 + 51.1t
Note that the horizontal position of the dart is not affected by the angle of elevation, so we do not need to consider it in this problem.
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Gordon types 3,300 words in 50 minutes. Find the unit rate.
Answer:
Step-by-step explanation:
All you need o divide 3,300 by 50
3300
÷ 50
--------------
66
so ever minute he would most likely type 66 words
PLEASEEEEEEEEEEEEEEEEEEEEEEEEEE HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP FASTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
Answer:
\(0 \: = 80 \\ 1 = 95 \\ 2 = 110 \\ 3 = 125\)
Step-by-step explanation:
\(p(x) = 15x + 80\)
5(2 + 3) = ? for easy points
Answer:25
Step-by-step explanation:
Answer:
25
Step-by-step explanation:
because you have to multiply to get the parentheses off.
company xyz know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 12.6 years and a standard deviation of 0.9 years.find the probability that a randomly selected quartz time piece will have a replacement time less than 10 years?
The probability that a randomly selected quartz time piece from company XYZ will have a replacement time of less than 10 years can be determined using the normal distribution with a mean of 12.6 years and a standard deviation of 0.9 years.
To calculate the probability, we need to find the area under the normal distribution curve to the left of 10 years. First, we need to standardize the value of 10 years using the formula z = (x - μ) / σ, where x is the value (10 years), μ is the mean (12.6 years), and σ is the standard deviation (0.9 years). Substituting the values, we get z = (10 - 12.6) / 0.9 = -2.89.
Next, we look up the corresponding z-score in the standard normal distribution table or use statistical software. The table or software tells us that the area to the left of -2.89 is approximately 0.0019
. This represents the probability that a randomly selected quartz time piece will have a replacement time less than 10 years. Therefore, the probability is approximately 0.0019 or 0.19%.
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