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weeeeeb [17]
3 years ago
8

Area of figure? Geometry help???

Mathematics
1 answer:
Serga [27]3 years ago
6 0
A = \dfrac{n}{360^\circ} \times \pi r^2

A = \dfrac{172^\circ}{360^\circ} \times 3.14159 \times (4~in.)^2

A = \dfrac{172^\circ}{360^\circ} \times 3.14159 \times 16~in.^2

A = 24.0~in.^2


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What is the product of (2x2 + 5x - 3) and (3x +7)?
kicyunya [14]

Answer:

6x^3 + 29x^2 + 26x -21

Step-by-step explanation:

(2x^2 + 5x -3)(3x + 7) = 6x^3 + 14x^2 + 15x^2 + 35x - 9x -21

                                  = 6x^3 + 29x^2 + 26x -21

8 0
3 years ago
Catie is trying to determine the height that a ladder reaches as it leans against a wall. She walks under the ladder and touches
brilliants [131]
18.56 feet
Catie creates a similar triangle with the ladder so we can create a proportion to solve for the height.  
\frac{baseto feet}{base to wall} = \frac{catie height}{wall height}
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\frac{1.33}{4.5} = \frac{5.5}{x}
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24.75=1.33x
divide both sides by 1.33
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4 0
3 years ago
Say that you (or your parents) are purchasing a used car for $19,850. The sales tax is 7.5%, the down payment is $1,000.00, and
Rudiy27
$326.83 goes towards the principal after your first payment.
7 0
4 years ago
Using the simple random sample of weights of women from a data​ set, we obtain these sample​ statistics: nequals45 and x overbar
Tomtit [17]

Answer: (141.1, 156.48)

Step-by-step explanation:

Given sample statistics : n=45

\overline{x}=148.79\text{ lb}

\sigma=31.37\text{ lb}

a) We know that the best point estimate of the population mean is the sample mean.

Therefore, the best point estimate of the mean weight of all women = \mu=148.79\text{ lb}

b) The confidence interval for the population mean is given by :-

\mu\ \pm E, where E is the margin of error.

Formula for Margin of error :-

z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}

Given : Significance level : \alpha=1-0.90=0.1

Critical value : z_{\alpha/2}=z_{0.05}=\pm1.645

Margin of error : E=1.645\times\dfrac{31.37}{\sqrt{45}}\approx 7.69

Now, the 90% confidence interval for the population mean will be :-

148.79\ \pm\ 7.69 =(148.79-7.69\ ,\ 148.79+7.69)=(141.1,\ 156.48)

Hence, the 90​% confidence interval estimate of the mean weight of all women= (141.1, 156.48)

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3 years ago
Which of the following sets are closed under subtraction? Select all that apply.
Vanyuwa [196]

only integers and polynomials are under subtraction.

7 0
4 years ago
Read 2 more answers
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