Which is the correct notation for A is a subset of B?

1. The hypothesis are given as follows:

2. The critical value is of: t = 2.3974.

3. The test statistic is of: t = 2.35.

4. The decision is: Reject the null hypothesis.

5. The conclusion is: There is enough evidence to conclude that the mean is greater.

At the null hypothesis, it is tested if there is not enough evidence to conclude that the mean in Los Angeles is greater, that is:

[tex]H_0: \mu \leq 178258[/tex]

At the alternative hypothesis, it is tested if there is enough evidence, hence:

[tex]H_1: \mu > 178258[/tex]

The t-distribution is used, as we have the standard deviation for the sample but not for the population. Using a t-distribution calculator, with 55 - 1 = 54 df, a right-tailed test, as we are testing if the mean is greater than a value and a significance level of 0.01, the critical value is:

t = 2.3974.

Hence the decision rule is defined as follows:

The test statistic is given by the equation presented as follows:

[tex]t = \frac{\overline{x} - \mu}{\frac{s}{\sqrt{n}}}[/tex]

The parameters are listed as follows:

In the context of this problem, the values of these parameters are given as follows:

[tex]\overline{x} = 191790, \mu = 178258, s = 42627, n = 55[/tex]

Hence the value of the test statistic is:

[tex]t = \frac{\overline{x} - \mu}{\frac{s}{\sqrt{n}}}[/tex]

[tex]t = \frac{191790 - 178258}{\frac{42627}{\sqrt{55}}}[/tex]

t = 2.35.

The test statistic is greater than the critical value, hence:

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8 pants wil cost 192 u.m.

10 pants ----> 240u.m

8 pants  ----> x

In a rule of 3, whenever the x is located at the bottom right corner, you always have to multiply upwards and to the right, and then divide the resulting number by the number on the top left. This is the operation you need to make:

x= (8 x 240) / 10

x= 192

Check the attached image to get a better understanding of this process.

8 pants wil cost 192 u.m.

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Proportional quantities are divided into directly and inversely proportional.

Two magnitudes are said to be directly proportional

when we multiply one of them by a number, the other is multiplied by the same number, and when we divide one of them by a number, the other is divided by the same number.

Problem :

If 10 pants cost 240u.m, how much will 8 pants cost?

We have:

[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: - \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: + \\ \bold{ Assumption \: { \rightarrow} 10 \: pants \: \rightarrow 240 \: u.m\\\sf \: \: \: \: \: \: \: \: \: Question \rightarrow8 \: pants \rightarrow \: x \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }[/tex]

As can be seen, the number of pants and the cost are magnitudes directly proportional, and therefore, we put the + sign below the pants and the - sign above.

Therefore we will have:

[tex]\boxed{ \bold{ \: x = \dfrac{240 * 8}{10} = 192 \: u.m} }[/tex]

So the 8 pants cost 192.

Answer:

Step-by-step explanation:

they are expecting you to know a few things.

first,  that ∠x   is asking for the interior angle of the labeled angle, here they call it  1 , so find that angle and look at the inside of the triangle,  it's also referred to as the minor angle.

second, they are expecting you to know how many degrees it is around the interior or a triangle... do you know?

then , just take that number and subtract the two given numbers to find the final number ,  or the  ∠1

got it?

The sum of n terms of geometric sequence with n=5, a₁ =4, r=3 is given by = 484.

Given that the sequence is geometric.

First term is = a₁ = 4

Common ratio is = r = 3

The number of terms for which the sum to be determined = n = 5

So the required sum of n terms of given geometric sequence is given by,

S [tex]=a_1\times\frac{r^n-1}{r-1}[/tex]

S [tex]=4\times\frac{3^5-1}{3-1}[/tex]

S = 4*((243-1)/2)

S = (4*242)/2

S = 484

Hence the sum of the given geometric sequence is 484.

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The percentage of pediatricians that work more than 70 h per week is; 2.275%

The formula for z-score of a normal distribution is;

z = (x' - μ)/σ

where;

x' is sample mean

μ is population mean

σ is standard deviation

We are given;

sample mean; x' = 70 hours

population mean; μ = 40 hours

standard deviation; σ = 15 hours

Thus;

z = (70 - 40)/15

z = 2

From online p-value from z-score calculator, we have;

p-value =  0.02275 = 2.275%

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Answer:

The answer would be the first one because when you factor -3 out, inside of the parentheses should be all positive because negative times negative is positive.

a) The expected value of each $1 bet in roulette is of: -$0.988.

b) The interpretation is given as follows: Over time, you should expect to lose about 999 cents for every dollar you bet.

The expected value of a discrete distribution is obtained as the sum of each outcome multiplied by it's respective probability.

The three-number bet is when one sequence of three numbers has to be correctly chosen, hence the probability of winning is of:

p = 1/(10³) = 1/1000.

(as there is only one correct sequence, and for each number, there are 10 outcomes).

The payout is given as follows:

11:1.

That is, if you win, you earn 11 times the amount you bet.

Considering a bet of $1, the distribution of earnings is given as follows:

Hence the expected value of the bet is:

E(X) = 11/1000 - 999/1000 = -$0.988.

Which is the amount you are expected to lose for every dollar you bet.

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Answer:

-x^5+2x³-x²-1x-1

Step-by-step explanation:

First order the terms based on highest degree or exponent.

-x^5+2x³-x²-3x¹+2x-1

Next combine like terms.

-3x¹ is simply -3x so -3x+2x = -1x

-x^5+2x³-x²-1x-1

Step-by-step explanation:

a polynomial of degree n (that means the highest exponent of x is n) must have n zeroes.

in our case that means 3 zeroes.

the best way to find them is to have the factorial form of the polynomial : to see how several terms are multiplied to give us the polynomial.

the first f(x) gives us exactly that (the second f(x) is just the form with all the multiplications done) :

f(x) = x(x + 6)(x - 2)

when is the product of factors 0 ?

only when at least one factor is 0.

so, let's see,

when is x 0 ? well, x = 0.

when is (x + 6) = 0 ? x = -6.

when is (x - 2) = 0 ? x = 2.

so, the 3 zeroes are

x = -6

x = 0

x = 2

The statement that are correct from the graph is:

Some input values are negative.

some output values are negative.

Some input values are integers.

Some output values are integers.

From the graph:

The x value is -2,-4 that is negative.

so the some inputs are negative.

Y has values -2 ,-4 which are negative.

So the some outputs are negative.

The point values from the graph is -4,-2,0,2,4 which belong to integers.

So some input values and output values are integers.

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Answer: there are 4 ways the committee can be formed

Step-by-step explanation:

The startup company needs to sell 68 skateboards in order to break even

To solve this problem, we have to find the profit of the company and what is required to break-even from total sales.

C(x) = 10x + 500

r(x) = -x² + 70x

Profit = revenue - cost

profit = (-x² + 70x) - 10x + 500

profit = -x² + 70x - 10x + 500

profit = -x² + 60x + 500

Solving the quadratic equation

x = 67.4 ≅68

For the startup to break even, they need to sell at least 68 skateboard.

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To find the set of numbers with a given mean we can assume them as consecutive terms, Zina did the same thing.

Mean or Arithmetic mean is the average of the given set of numbers. It is also denoted as the equal distribution of values for a given data. To calculate the mean of data, we can use the following formula  

Mean/Average = Sum of observations ÷ Number of observations

Here we have

The average of 5 numbers is 85

Let's assume that the 5 numbers are 5 consecutive numbers and the five numbers are x, x+1, x+2, x+3, x+4, and x+5  [ for simple calculations ]  

Average of 5 numbers = Sum of numbers / 5

⇒ 85 = (x+ x+ 1 + x+2 + x+3 + x+4 ) /5

⇒ 425 = 5x + 10  

⇒ 5x = 415

⇒ x = 83

Then the 5 numbers are 83, 84, 85, 86, and 87

Therefore,

To find the set of numbers with a given mean we can assume them as consecutive terms and we can calculate the mean, Zina did the same thing.  

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The solution of the trigonometry function is  2√3/3.

What is the trigonometric function?

Simply put, trigonometric functions—also referred to as circular functions—are the functions of a triangle's angle. This means that these trig functions provide the relationship between the angles and sides of a triangle. Sine, cosine, tangent, cotangent, secant, and cosecant are the fundamental trigonometric functions.

Given trigonometric function is

sec^(-1) x = csc^(-1) 2

Assume that,

csc^(-1) 2 = z

→ 2 = csc z

→ 1/2 =1/ (csc z)

→ 1/2 =sin z

The trigonometry identity is [tex]\cos x =\sqrt{1-\sin^2x}[/tex].

[tex]\sqrt{1-(\frac{1}{2})^2 } =\cos z[/tex]

→ cos z = √3/2

→ sec z = 2/√3

→ sec z = 2√3/(√3×√3)

→ sec z = 2√3/3

→  z =sec^(-1) ( 2√3/3) = csc^(-1) 2

Putting csc^(-1) 2 = sec^(-1) ( 2√3/3):

sec^(-1) x = sec^(-1) ( 2√3/3)

→ x = 2√3/3

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The matrix AB = [tex]\left[\begin{array}{ccc}-2&16&11\\7&46&-3\\11&26&-9\end{array}\right][/tex]

Given,

In the question:

The matrix is given as:

A = [tex]\left[\begin{array}{ccc}-4&-3&5\\-5&-4&-2\\-1&-2&-4\end{array}\right][/tex]   & B = [tex]\left[\begin{array}{ccc}3&-4&-1\\-5&-5&1\\-1&-3&2\end{array}\right][/tex]

To find the AB :

Now, According to the question:

AB =  [tex]\left[\begin{array}{ccc}-4&-3&5\\-5&-4&-2\\-1&-2&-4\end{array}\right][/tex]  [tex]\left[\begin{array}{ccc}3&-4&-1\\-5&-5&1\\-1&-3&2\end{array}\right][/tex] = [tex]\left[\begin{array}{ccc}-2&16&11\\7&46&-3\\11&26&-9\end{array}\right][/tex]

The basic Addition and Multiplication:

= -4 x 3 + (-3)x (-5) + 5 x (-1) = -12 +15 -5 = -2

= (-4) x (-4) + (-3)x (-5) + 5x (-3) = 16 + 15 -15 = 16

=(-4)x (-1) + (-3) x 1 + 5x 2 = 4 - 3 +10 = 11

= (-5) x 3 +(-4) x(-5) + (-2) x (-1) = -15 + 20 +2 = 7

= (-5) x(-4) + (-4)x (-5) + (-2) x (-3) = 20 + 20 + 6 = 46

= (-5) x (-1) + (-4) x 1 + (-2) x 2 = 5 - 4 - 4 = -3

= (-1) x 3 + (-2) x (-5) + (-4) x(-1) = -3 + 10 +4 =  11

=(-1) x(-4)+ (-2)x (-5) + (-4) x (-3) = 4 + 10 + 12 = 26

= (-1) x(-1) + (-2) x 1 + (-4) x 2 = 1 - 2 +(-8) = -9

Hence, The matrix AB = [tex]\left[\begin{array}{ccc}-2&16&11\\7&46&-3\\11&26&-9\end{array}\right][/tex]

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Answer: 1 3\5

explanation :  since the denominator of both fractions are same we can go ahead and the numerators which will make the fraction 16\10 or 8/5 (simplified) and  to make this a mixed numeral 5 fits into 8 once with 3 leftover thus making 1 3/5.

hope this helps .

The percent represented by the shaded area as in the task content is; 40%.

It follows from the task content that the percent of the whole that is shaded as in the task content be determined.

By observation, the whole is partitioned into 5 parts with 2 parts shaded.

Consequently, when expressed as a fraction; the shaded region is; 2 / 5 of the whole.

Ultimately, when expressed as a percentage, the shaded region is;

( 2 / 5 ) × 100% = 0.4 × 100%

= 40%.

Ultimately, the percent of the whole that is shaded is; 40%.

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Answer: 12

Step-by-step explanation: When multiplying (in this case finding a product,) by one, the number you are multiplying will always be the answer.

The equation of the line that passes through the point (−7,−4) with slope 10/7 is y = (10/7)x + 6

The coordinates of the point = (-7, -4)

The slope of the line = 10/7

The slope intercept form is

y = mx + b

Where m is the slope of the line

b is the y intercept

The point slope form is

[tex]y-y_1=m(x-x_1)[/tex]

Where [tex](x_1,y_1)[/tex] is the coordinates of the point

Substitute the values in the equation

y -(-4) = 10/7(x - (-7))

y + 4 = (10/7)(x + 7)

Convert to slope intercept form

y +4 = (10/7)x + 10

y = (10/7)x + 10 - 4

y = (10/7)x + 6

Hence, the equation of the line that passes through the point (−7,−4) with slope 10/7 is y = (10/7)x + 6

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Answer:

Tan a =1

Step-by-step explanation:

TRIG identity:

Tan ( a+b) =  (tan a + tan b )/ (1 - tan a  tan b)     Sub in the given values

      -2       = ( tan a + 3) / ( 1 - 3 tan a)

-2 + 6 tan a = tan a + 3

5 tan a = 5

  tan a = 1

Answer:

[tex]10\sqrt{6}[/tex] feet by [tex]\frac{20}{3}\sqrt{6}[/tex] ft

Step-by-step explanation:

If the length is [tex]l[/tex], then the width is [tex]\frac{2}{3}l[/tex].

Using the formula for the area of a rectangle,

[tex]l \cdot \frac{2}{3}l=400 \\ \\ \frac{2}{3}l^2=400 \\ \\ l^2=600 \\ \\ l=10\sqrt{6}[ \\ \\ \implies w=\frac{20}{3}\sqrt{6}[/tex]

g(x) is a vertical dilation of f(x), then the x-value of the vertex does not change, using that we will see that the vertex of g(x) is (-4, 24)

We know that there is a parabola graphed called f(x), such that the vertex of f(x) is at (-4, 6).

We also have a vertical dilation of this function defined as:

g(x) = 4*f(x)

Notice that because this is a vertical dilation, the x-value of the vertex does not change, then the vertex is at x = -4, like on f(x).

Evaluating there we get:

g(-4) = 4*f(-4)

And because the vertex of f(x)  is (-4, 6), then we know that:

f(-4) =6

Replacing that we get:

g(-4) = 4*f(-4) = 4*6 = 24

Then the vertex of g(x) is at (-4, 24)

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Answer:

[ D ] 140

Step-by-step explanation

4 x 265 = 1060

1060 - 1200 = -140

the answer is 140  i hope this helped <3

The average rate of change of the function f(x) on the interval −9≤x≤1 is of:

r = -0.2.

The average rate of change of a function is obtained by the change in the output divided by the change in the input. Hence, over an interval [a,b], the rate is given by the equation presented as follows:

[tex]r = \frac{f(b) - f(a)}{b - a}[/tex]

Over the interval −9≤x≤1, the bounds of the interval are given as follows:

a = -9, b = 1.

From the graph shown by the image presented at the end of the answer, the numeric value of the function at each of these bounds is given as follows:

Hence the average rate of change of the function on the interval is calculated as follows:

r = (1 - 3)/(1 - (-9)) = -2/10 = -0.2.

The graph is shown by the image at the end of the answer.

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Based on the perimeter of this isosceles triangle, the possible x-coordinate for point L is either -16.85 or 10.85.

In Mathematics, the perimeter of an isosceles triangle can be determined by summing up all of its side lengths that encloses. Mathematically, the perimeter of isosceles triangle JKL is given by this mathematical expression:

Perimeter, P = JK + JL+ KL

36 = JK + JL+ KL

Next, we would determine the distance between each vertices by using this formula:

Distance = √[(x₂ - x₁)² + (y₂ - y₁)²]

Distance JK = √[(-3 - (-3))² + (-9 - 7)²]

Distance JK = √0 + 256

Distance JK = √256

Distance JK = 16

Distance JL = √[(-9 - (-1))² + (-3 - x)²]

Distance JL = √8² + (-3 - x)²

Distance JL = √64 + (-3 - x)²

Distance KL = √[(7 - (-1))² + (-3 - x)²]

Distance KL = √8² + (-3 - x)²

Distance KL = √64 + (-3 - x)²

Note: Side JK is equal to side KL as an isosceles triangle.

From the perimeter of this isosceles triangle, we have:

36 = JK + JL+ KL

36 = 16 + JL+ JL

2JL = 20

JL = 10 units.

Now, we can determine the possible x-coordinate for point L:

256 = 64 + (-3 - x)²

256 - 64 = (-3 - x)²

192 = (-3 - x)²

13.85 = -3 - x

x = -3 ± 13.85

x = (-3 -  13.85) or (-3 + 13.85)

x = -16.85 or 10.85

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