Suppose a simple random sample of size n = 81 is obtained from a population with mu = 84 and sigma = 27. (a) Describe the sampling distribution of x. (b) What is P (x > 89.7)? (c) What is P (x lessthanorequalto 77.85)? (d) What is P (81.15 < x < 88.65)?

The angle of depression of the airplane is 3.6⁰.

The angle of depression of the airplane is calculated by forming a triangle with base displacement of the airplane and the altitude.

base of the right triangle = 15 miles = 79,200 ft

height of the right triangle = 5,000 ft

The angle of depression is calculated as follows;

θ = arc tan ( h / b )

θ = arc tan ( 5000 / 79,200 )

θ = 3.6⁰

Thus, the angle of depression of the airplane is a function of the altitude and base displacement of the airplane.

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Answer:

17/20

Step-by-step explanation:

\(\frac{3}{4}\) + \(\frac{4}{5}\) - \(\frac{7}{10}\)

common denominator is 20

15/20 + 16/20 - 14/20

17/20

The mass of ore required is 6889.7 kg and the mass of 80% H2SO4 solution required is 0.68 kg (approx.).

Mass of pure TiO2 to be produced = 1500 kg

Mass % of Ti in ore = 24.3%.

Mass of Ti in ore = 24.3/100 x

x = 0.243x kg 1 kg of ilmenite (FeTiO3) will produce (1/FeTiO3 molar mass) kg of (TiO)SO4 solution. x kg of ilmenite will produce (x/FeTiO3 molar mass) kg of (TiO)SO4 solution.

Let mass of ore required be x kg

Mass of ferric oxide (Fe2O3) required for reaction with produced (TiO)SO4 solution = 2/3 x (x/FeTiO3 molar mass)

= 2x/3Fe2O3 reacts with 3 H2SO4 and produces 1 Fe2(SO4)3.

So, (2x/3) kg of Fe2O3 reacts with (2x/FeTiO3 molar mass) x (3/1) = 6x/FeTiO3 molar mass kg of H2SO4.

So, 80% H2SO4 required = 6x/FeTiO3 molar mass x 100/80 kg

= 15x/FeTiO3 molar mass kg For complete reaction, ilmenite reacts with 2 H2SO4 and produces (TiO)SO4.

So, (0.243x/FeTiO3 molar mass) kg of (TiO)SO4 is produced. But only 89% of ilmenite reacts.

So, (0.89 x 0.243x/FeTiO3 molar mass) kg of (TiO)SO4 is produced.

Mass of H2TiO3 produced = (0.89 x 0.243x/FeTiO3 molar mass) kg

Mass of H2SO4 produced = 2 x (0.89 x 0.243x/FeTiO3 molar mass) kg Mass of TiO2 produced = 0.89 x 0.243x/FeTiO3

molar mass kg = 0.21747x kg

But the given mass  of TiO2 to be produced is 1500 kg.∴

0.21747x = 1500x

= 6889.7 kg

Mass of 80% H2SO4 required = 15x/FeTiO3

molar mass = 15 x 6889.7/1,51,200 kg

= 0.68 kg (approx.)

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To produce 1500 kg of pure TiO2, we need 18773.4 kg of ilmenite and 70234.2 kg of 80% sulfuric acid solution.

To calculate the masses of ore and 80% sulfuric acid solution required to produce 1500 kg of pure TiO2, we can follow the steps given in the question.

Determine the mass of TiO2 in the desired quantity.
Since we want 1500 kg of pure TiO2, the mass of TiO2 is 1500 kg.

Calculate the mass of ilmenite required.
From the equation FeTiO3 + 2H2SO4 → (TiO)SO4 + FeSO4 + 2H2O, we can see that 1 mole of ilmenite (FeTiO3) produces 1 mole of TiO2. Therefore, the molar mass of TiO2 is equal to the molar mass of ilmenite (FeTiO3).
The molar mass of TiO2 is 79.9 g/mol, so the mass of ilmenite required is:
(1500 kg / 79.9 g/mol) x (1 mol FeTiO3 / 1 mol TiO2) = 18773.4 kg

Calculate the mass of 80% sulfuric acid solution required.

Since 80% sulfuric acid is supplied in excess (50% more than necessary), we need to calculate the mass of sulfuric acid required for the complete reaction of ilmenite and ferric oxide

From the equation FeTiO3 + 2H2SO4 → (TiO)SO4 + FeSO4 + 2H2O, we can see that 1 mole of ilmenite reacts with 2 moles of sulfuric acid.

The molar mass of sulfuric acid is 98.1 g/mol, so the mass of sulfuric acid required for the complete reaction is:
(18773.4 kg / 79.9 g/mol) x (2 mol H2SO4 / 1 mol FeTiO3) x (98.1 g/mol) = 46822.8 kg

Since the sulfuric acid is supplied in excess (50%), we need 50% more than the calculated mass:
Mass of 80% sulfuric acid solution = 1.5 x 46822.8 kg = 70234.2 kg

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Answer:

\(f(f^{-1} (22))\) equals 22.

Step-by-step explanation:

For every input in a function, there will be one corresponding output. When taking the output of the function and inserting it as the input to the inverse function of the original, the output will be equivalent to the exact input of the original function. In this case, because \(f(7)=22\), that means \(f^{-1} (22)\) will equal 7. Using this knowledge, you can find the value of \(f(f^{-1} (22))\), which will be \(f(f^{-1} (22)) = f(7)=22\), so \(f(f^{-1} (22))\) equals 22.

Step-by-step explanation:

draw a rectangle with width 98 and height 55 there are two of each side, so 98 + 98 + 55 +55 = 306

Answer:

306m

Step-by-step explanation:

You need to find the perimeter of the rectangle. To do that, you just add the side lenghts. So, this is your lawn with the side lengths:

                      55m
           _____________
           |                           |
           |                           |
           |                           |
98m    |                           |     98m
           |                           |
           |                           |
           |                           |
           _____________
                      55m

You just add them together!

55 + 55 + 98 + 98 = 306

so you need 306 meters of fencing

The sales trend Sales = 181.00 + 2t where t= time in quarters, beginning in Q1 2014The seasonal factors for the four quarters are i.e: {0.9, 1.1, 1.2, 0.8}

To find the seasonalized forecast for Q2 of 2017, the following steps must be followed:

Step 1: Calculate trend for the Q2 of 2017 t = 3.25

Step 2: Determine seasonal factor for Q2 which is 1.1 since it's the second quarter

Step 3: Multiply trend and seasonal factors to get seasonalized trend for Q2 = (181 + 2(3.25)) * 1.1 = 198.95

Step 4: Therefore, the seasonalized forecast for Q2 of 2017 is 198.95.

Therefore, we have Sales = 181.00 + 2t where t is the time in quarters, starting from Q1 2014. In other words, t = 1 for Q1 2014, t = 2 for Q2 2014, and so on.

In addition, we have seasonal factors for each quarter, i.e, {0.9, 1.1, 1.2, 0.8}.

To calculate the seasonalized forecast for Q2 of 2017, we need to follow the following steps:

Step 1: Calculate trend for the Q2 of 2017t = 3.25 [since there are 13 quarters between Q1 2014 and Q2 2017.

The 13th quarter corresponds to Q2 2017. So, t = 13. Therefore, t = 2 + 4(13 - 1) = 3.25]

Step 2: Determine the seasonal factor for Q2 of 2017

The seasonal factor for Q2 of 2017 = seasonal factor for the second quarter = 1.1

Step 3: Multiply trend and seasonal factors to get seasonalized trend for Q2

Therefore, seasonalized trend for Q2 of 2017 = (181 + 2(3.25)) * 1.1 = 198.95Step 4:

Therefore, the seasonalized forecast for Q2 of 2017 is 198.95.

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well, the price difference is 60000 - 40000 = 20000.

so, we're told that the price increase acres wise is 800 bucks per acre, but we also know it's a total of 20000, so how may times does 800 go into 20000?

20000 ÷ 800 = 25.

so we know that in 20000 bucks there are 25 acres, so how many will there be in 60000 bucks?

\(\begin{array}{ccll} \$&acres\\ \cline{1-2} 20000&25\\ 60000&x \end{array}\implies \cfrac{20000}{60000}=\cfrac{25}{x}\implies \cfrac{1}{3}=\cfrac{25}{x}\implies \stackrel{acres}{x=75}\)

Answer:i have no idea!

Step-by-step explanation:

6.1). the rate of depreciation, r, is approximately 10.77%.

6.2.1). Ncominkosi's monthly installment amount was approximately R 10,505.29.

6.2.2).  Ncominkosi borrowed approximately R 377,510.83 from the bank.

6.1) Let's assume the original price of the laptop is P. According to the reducing balance method, the value of the laptop after 4 years can be calculated as P * (1 - r/100)^4. We are given that this value is 31% of the original price, so we can write the equation as P * (1 - r/100)^4 = 0.31P.

Simplifying the equation, we get (1 - r/100)^4 = 0.31. Taking the fourth root on both sides, we have 1 - r/100 = ∛0.31.

Solving for r, we find r/100 = 1 - ∛0.31. Multiplying both sides by 100, we get r = 100 - 100∛0.31.

Therefore, the rate of depreciation, r, is approximately 10.77%.

6.2.1) To determine the monthly installment amount, we can use the formula for calculating the monthly payment on a loan with compound interest. The formula is as follows:

\(P = \frac{r(PV)}{1-(1+r)^{-n}}\)

Where:

P = Monthly payment

PV = Loan principal amount

r = Monthly interest rate

n = Total number of monthly payments

Let's calculate the monthly installment amount for Ncominkosi's loan:

Loan amount = Total amount paid to the bank - Interest

Loan amount = R 596,458.10 - R 0 (No interest is deducted from the total paid amount since it is the total amount paid)

Monthly interest rate = Annual interest rate / 12

Monthly interest rate = 9.5% / 12 = 0.0079167 (rounded to 7 decimal places)

Number of monthly payments = 6 years * 12 months/year = 72 months

Using the formula mentioned above:

\(P = \frac{0.0079167(Loan Amount}{1-(1+0.0079167)^{-72}}\)

Substituting the values:

\(P = \frac{0.0079167(596458.10}{1-(1+0.0079167)^{-72}}\)

Calculating the value:

P≈R10,505.29

Therefore, Ncominkosi's monthly installment amount was approximately R 10,505.29.

6.2.2) To determine the amount of money Ncominkosi borrowed from the bank, we can subtract the interest from the total amount he paid to the bank.

Total amount paid to the bank: R 596,458.10

Since the total amount paid includes both the loan principal and the interest, and we need to find the loan principal amount, we can subtract the interest from the total amount.

Since the interest rate is compounded monthly, we can use the compound interest formula to calculate the interest:

\(A=P(1+r/n)(n*t)\)

Where:

A = Total amount paid

P = Loan principal amount

r = Annual interest rate

n = Number of compounding periods per year

t = Number of years

We can rearrange the formula to solve for the loan principal:

\(P=\frac{A}{(1+r/n)(n*t)}\)

Substituting the values:

Loan principal (P) = \(\frac{596458.10}{(1+0.095/12)(12*6)}\)

Calculating the value:

Loan principal (P) ≈ R 377,510.83

Therefore, Ncominkosi borrowed approximately R 377,510.83 from the bank.

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Answer:

you would be..80

Step-by-step explanation:

All you have to do is an addition equation

60 + 20 = 80

Answer:

x = 2.

Step-by-step explanation:

First convert to vertex form:

f(x) = 5x^2 - 20x + 3

= 5(x^2 - 4x) + 3

= 5 [(x - 2)^2 - 4] + 3

= 5(x - 2)^2 -20 + 3

= 5(x - 2)^2 - 17.

The line of symmetry  is x = 2.

Tο get system B, the secοnd equatiοn in system A was replaced by the sum οf the equatiοn and the first equatiοn multiplied by -3. The sοlutiοn tο system B is the same as the sοlutiοn in system A.

A system οf equatiοns in algebra cοnsists οf twο οr mοre equatiοns and lοοks fοr cοmmοn answers tο the equatiοns. "A cοllectiοn οf equatiοns fulfilled by the same set οf variables is called a system οf linear equatiοns." Finding the values οf the variables emplοyed in a system οf equatiοns entails sοlving the set οf equatiοns. By keeping the equatiοns balanced οn bοth sides, we cοmpute the values οf the unknοwn variables. Finding the value οf the variable that makes the cοnditiοn οf all the prοvided equatiοns true is the primary gοal when sοlving an equatiοn system.

Tο get system B, the secοnd equatiοn in system A was replaced by the sum οf the equatiοn and the first equatiοn multiplied by -3. The sοlutiοn tο system B is the same as the sοlutiοn in system A.

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Answer:

\(\frac{1}{x-5}\)

Step-by-step explanation:

Let me know if anything is unclear!

An inequality is a mathematical statement that uses symbols such as < (less than), > (greater than), ≤ (less than or equal to), or ≥ (greater than or equal to) to compare two quantities. In real life, we can use inequalities to describe a wide range of situations. For example, let's say you are buying groceries and you have a budget of $50. You could use the inequality  total cost of groceries < $50 to describe your situation. This inequality states that the total cost of the groceries must be less than $50, or you will exceed your budget.

In another real life situation, let's say you are training for a race and you want to run a certain distance in a specific amount of time. You could use the inequality distance > speed × time to describe your goal. This inequality states that the distance you run must be greater than the product of your speed and the time it takes you to complete the race. Inequality statements can also be used in social science and economics. For example, we can use an inequality to describe the income distribution in a society. We could say that the top 10% of earners have an income greater than the bottom 90% of earners, using the inequality top 10% income > bottom 90% income.

In summary, inequalities can be used to describe real life situations by comparing two quantities using symbols such as <, >, ≤, or ≥. We can use inequalities to describe a wide range of situations, from grocery shopping to income distribution.

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(a) f∘g(3) = 97

(b) g∘f(3) = 13

(a) To calculate f∘g(3), we need to substitute the value of g(3) into f(x) and simplify the expression.

Given f(x) = x^2 - 1/x and g(x) = x + 7, we first evaluate g(3):

g(3) = 3 + 7 = 10

Now, substitute g(3) into f(x):

f∘g(3) = f(g(3)) = f(10)

Replace x in f(x) with 10:

f∘g(3) = (10)^2 - 1/(10) = 100 - 1/10 = 99.9

Therefore, f∘g(3) = 97.

(b) To calculate g∘f(3), we need to substitute the value of f(3) into g(x) and simplify the expression.

Given f(x) = x^2 - 1/x and g(x) = x + 7, we first evaluate f(3):

f(3) = (3)^2 - 1/(3) = 9 - 1/3 = 8.6667

Now, substitute f(3) into g(x):

g∘f(3) = g(f(3)) = g(8.6667)

Replace x in g(x) with 8.6667:

g∘f(3) = 8.6667 + 7 = 15.6667

Therefore, g∘f(3) = 13.

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The null hypothesis to test for instruments' relevance is option D) H0:π2=0 or π3=0 or π4=0.In order to test the relevance of the instrument, the first stage equation's null hypothesis should be stated as: H0: π2 = 0 or π3 = 0 or π4 = 0.The relevance requirement will be fulfilled if we can refute the null hypothesis.

The null hypothesis will not be rejected if the F-statistic is less than 10.0. However, if the F-statistic is greater than 10.0, the null hypothesis will be rejected, indicating that the variables are relevant and that the instrument satisfies the relevance requirement.In summary, to test for instruments' relevance in TSLS, the null hypothesis of the first stage equation is stated as H0: π2 = 0 or π3 = 0 or π4 = 0.

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Hello there & welcome to Brainly!

You are solving for the variable, k. Isolate the variable, k. Note the equal sign, what you do to one side, you do to the other.

First, distribute -12 to all terms within the parenthesis:

-12(k + 4) =

-12 * k = -12k

-12 * 4 = -48

-12k - 48 = 60

Isolate the variable, k. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS is the order of operation, and equal:

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction

First, add 48 to both sides of the equation:

-12k - 48 (+48) = 60 (+48)

-12k = 60 + 48

-12k = 108

Next, divide -12 from both sides of the equation:

(-12k)/-12 = (108)/-12

k = 108/-12

k = -9

k = -9 is your answer.

~

Answer:

The sales tax rate is 5%.

Step-by-step explanation:

To determine the sales tax rate if you already know the amount of tax being added to the purchase price, divide the amount of tax by the purchase price. In this example, divide $1.29 (amount of tax being added) by $25.79 (purchase price). When you do that, you will see that the answer is 0.0500, or 5%.

"the probability that a student plays video games given that the student is female." is an example of a conditional probability.The correct answer is option C.

A conditional probability is a probability that is based on certain conditions or events occurring. Out of the options provided, option C is an example of a conditional probability: "the probability that a student plays video games given that the student is female."

Conditional probability involves determining the likelihood of an event happening given that another event has already occurred. In this case, the event is a student playing video games, and the condition is that the student is female.

The probability of a female student playing video games may differ from the overall probability of any student playing video games because it is based on a specific subset of the population (female students).

To calculate this conditional probability, you would divide the number of female students who play video games by the total number of female students.

This allows you to focus solely on the subset of female students and determine the likelihood of them playing video games.

In summary, option C is an example of a conditional probability as it involves determining the probability of a specific event (playing video games) given that a condition (being a female student) is satisfied.

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The coordinates of the specified vertex after the given transformations is  R'(3,3).

From the figure:

Finding the coordinates:

Q(1,3)

R(3,-3)

S(0,-2)

T(-2,1)

The coordinates is transformed 90 degrees about the origin:

The rule for transforming coordinates(x,y) 90 about the origin is (-y,x).

we need to find R':

R(3,-3) → R'(-(-3),3)

R(3,-3) → R'(3,3)

Therefore the coordinates of the specified vertex after the given transformations is  R'(3,3).

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Answer:

4x=>-74

Step-by-step explanation:

x+23=>18

4(x+23)=>18

4x+92=>18

collect like terms

4x=>18-92

4x=>-74

Answer is 4 (x + 23 ) ≥ 18

Step by step

4 times the sum of a number and 23

4(x + 23)

Is at least 18

≥ 18

Your inequality

4 (x + 23 ) ≥ 18

to solve, distribute

4x + 92 ≥ 18

subtract 92 from both sides

4x + 92 - 92 ≥ 18 - 92

simplify

4x ≥ -74

divide both sides by 4 to solve for x

4/4 x ≥ -74/4

x ≥ 18.5

18.5 is equal to or greater than 18 so problem solved

** We used ≥ in this inequality which means at least (equal to) this number or greater

Answer:

B

Step-by-step explanation:

Because the range are the y values

The range of the given function is {-3, 1, 5,9}. Therefore, option B is the correct answer.

The domain and range are defined for a relation and they are the sets of all the x-coordinates and all the y-coordinates of ordered pairs respectively. For example, if the relation is, R = {(1, 2), (2, 2), (3, 3), (4, 3)}, then:

Domain = the set of all x-coordinates = {1, 2, 3, 4}

Range = the set of all y-coordinates = {2, 3}

The solution set of the given function is {(-1, -3), (0, 1), (1,5), (3,9)}.

Range is the set of all y-coordinates

So, the range is {-3, 1, 5, 9}

Therefore, option B is the correct answer.

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In the last 10 presidential elections, the Democratic candidate has won six times in Michigan and four times in Ohio.

In the context of presidential elections, Michigan and Ohio are two key swing states that often play a crucial role in determining the outcome of the overall election. The statement indicates that in the last 10 presidential elections, the Democratic candidate emerged victorious six times in Michigan and four times in Ohio.

This information suggests that Michigan has been a more favorable state for the Democratic candidate compared to Ohio in recent election cycles. The Democratic candidate's success in Michigan for six out of the last 10 elections implies a higher level of support or electoral advantage in that state.

On the other hand, the Democratic candidate won four out of the last 10 elections in Ohio, indicating a relatively more balanced or competitive political landscape in that state. While the Democratic candidate has had some success in Ohio, the Republican candidate likely secured victories in the remaining six elections.

The varying electoral outcomes in these swing states highlight the importance of analyzing the political dynamics, demographics, and voting patterns within each state to understand the factors that contribute to election results. These results can provide insights into the electoral strategies, voter preferences, and overall political landscape of Michigan and Ohio.

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Answer:

(C) 2x^3 - 3x^2 - 35x + 36

Step-by-step explanation:

First multiply 2x by x^2 + 3x - 4:

(2x)(x^2 + 3x - 4)

2x^3 + 6x^2 - 8x

Next multiply -9 by x^2 + 3x - 4:

(-9)(x^2 + 3x - 4)

-9x^2 - 27x +36

Now add the two polynomials by adding like terms:

(2x^3 + 6x^2 - 8x) + (-9x^2 - 27x +36)

2x^3 + 6x^2 - 9x^2 - 8x - 27x + 36

2x^3 - 3x^2 - 35x + 36

Hope this helps (●'◡'●)

Answer:

2*2*5*5

Step-by-step explanation:

Using long division the quotient of  (2x^3-5x^2+3x-6) divided by (x+4)  is 2x^2 - 13x + 55.

Quotients are often used in algebra and other branches of mathematics to solve equations and expressions involving division. They are also commonly used in everyday life, such as when calculating the cost per unit of a product, or the average speed of a journey.

For example, if we divide 10 by 2, the quotient would be 5, since 10 divided by 2 equals 5. Similarly, if we divide 12 by 3, the quotient would be 4, since 12 divided by 3 equals 4.

Now let find the quotient using long division:

2x^2 - 13x + 55

_______________________

x + 4 | 2x^3 - 5x^2 + 3x - 6

- (2x^3 + 8x^2)

---------------

- 13x^2 + 3x

- (-13x^2 - 52x)

---------------

55x - 6

- (55x + 220)

-----------

-226

Therefore, the quotient is 2x^2 - 13x + 55 and the remainder is -226.

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Answer:

C^5d^5

Step-by-step explanation:

The equivalent expression is,

⇒ c⁵ × d⁵

We have to given that,

An expression is,

⇒ (cd)⁵

Since, A mathematical expression is a group of numerical variables and functions that have been combined using operations like addition, subtraction, multiplication, and division.

Now, Solve the expression by rule of exponent as,

⇒ (cd)⁵

⇒ c⁵ × d⁵

Therefore, The correct equivalent expression is,

⇒ c⁵ × d⁵

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Answer: 68 degrees

Step-by-step explanation:

The sound intensity level should be decreased by 2 dB to carry the studio into consistency with the rules.

A decrease of 2 dB can be accomplished by one or the other by closing down a portion of the machines (since the sound intensity level declines by 6 dB for each splitting of the sound power) or by introducing sound-sealing materials.

Thus, to carry the studio consistent with the rules, 16 machines would need to be closed down.

It's vital to follow well-being and security rules in the working environment to guarantee the prosperity of representatives and forestall hearing harm. Decreasing the number of machines or introducing soundproofing materials can bring the studio into consistency.

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