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3 years ago

I need help please i need correct answer

Mathematics

2 answers:

Temka [501]3 years ago

8 0

Answer:

Step-by-step explanation:

Georgia [21]3 years ago

6 0

The dimensions tell you that the pool is a rectangle and is going to have 2 sides equal to each other, and the other 2 sides equal to each other

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Pls help me solve for x in this equation! + brainest

MA_775_DIABLO [31]

Answer:

x = -3

Explanation:

$\rightarrow \sf \sqrt[3]{\sf 3x + 1} = -2$

$\rightarrow \sf \sf 3x + 1 = (-2)^3$

$\rightarrow \sf \sf 3x + 1 = -8$

$\rightarrow \sf \sf 3x = -8-1$

$\rightarrow \sf \sf 3x = -9$

$\rightarrow \sf \sf x = -3$

4 0

2 years ago

Read 2 more answers

If the area of Bianca’s rectangular backyard patio is represented by the expression x2 – 18x + 81, and the length of the patio i

miss Akunina [59]

<u>1) </u> $width=x-9$

2) Rectangular shape is square shape patio !

<u>Step-by-step explanation:</u>

Here we have , the area of Bianca’s rectangular backyard patio is represented by the expression x2 – 18x + 81, and the length of the patio is represented by the expression x − 9: We need to find

1. what is the expression for the width of the patio? Explain and show all work.

We know that area of rectangle = $Length(width)$

⇒ $x^2-18x+81=(x-9)(width)$

Factorizing RHS:

⇒ $x^2-9x-9x+81=(x-9)(width)$

⇒ $x(x-9)-9(x-9)=(x-9)(width)$

⇒ $(x-9)(x-9)=(x-9)(width)$

⇒ $width=x-9$

2. what special rectangular shape is the patio?

Now , we see that

$Length = x-9\\Width=x-9$

A rectangle whose length & width are equal is known as a square ! Hence , Rectangular shape is square shape patio !

5 0

3 years ago

a tutor works with a group of students. the tutor charges a base fee of $40 plus $30 for each student in the group. today the tu

Thepotemich [5.8K]

Answer: y=6

Step-by-step explanation:

Let's solve your equation step-by-step.

30y+40=220

Step 1: Subtract 40 from both sides.

30y+40−40=220−40

30y=180

Step 2: Divide both sides by 30.

30y/30= 180/30

y=6

5 0

3 years ago

Please tell me what the value of x is

Aleks04 [339]

Answer:I think that’s a degree
:
40 degrees

8 0

2 years ago

Consider random samples of size 86 drawn from population A with proportion 0.43 and random samples of size 60 drawn from populat

Elan Coil [88]

Answer:

a) The standard error is s = 0.071.

b) Yes, as both sample sizes are above 30.

Step-by-step explanation:

To solve this question, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean $\mu = p$ and standard deviation $s = \sqrt{\frac{p(1-p)}{n}}$

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Samples of size 86 drawn from population A with proportion 0.43

This means that $n = 86, p = 0.43$ . So:

$s_A = \sqrt{\frac{0.43*0.57}{86}} = 0.0534$

Samples of size 60 drawn from population B with proportion 0.15:

This means that $n = 60, p = 0.15$ . So:

$s_B = \sqrt{\frac{0.15*0.85}{60}} = 0.0461$

(a) Find the standard error of the distribution of differences in sample proportions A - B Round your answer for the standard error to three decimal places. Standard error=

This is:

$s = \sqrt{s_A^2 + s_B^2}$

$s = \sqrt{(0.0534)^2 + (0.0461)^2}$

$s = 0.071$

The standard error is s = 0.071.

(b) Are the sample sizes large enough for the Central Limit Theorem. Yes or No?

Yes, as both sample sizes are above 30.

5 0

3 years ago