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Irina-Kira [14]
3 years ago
14

I will mark as brainliest Do 1-9

Mathematics
1 answer:
dangina [55]3 years ago
5 0
To solve this problem, we need to know the formulas for the areas of each of these shapes. The formula for the area of a circle is πr², the area of a rectangle is b * h, the area for a square is s², and the area for a triangle is 0.5bh. Now we can solve.

1) This is a circle, so the area is πr² = π(6)² = 36<span>π square feet

2) This is a square, so the area is s</span>² = 12² = 144 square yards

3) This is a rectangle, so the area is b * h = 6 * 14 = 84 square inches

4) This is a rectangle, so the area is b * h = 7 * 3 = 21 square inches

5) This is a circle, so the area is πr² = π(4)² = 16<span>π square feet

6) This is a triangle, so the area is 0.5bh = 0.5 (8 * 8) = 0.5 * 64 = 32 yd.</span>²

7) This is a triangle, so the area is 0.5bh = 0.5 (5 * 10) = 50 * 0.5 = 25 yd.²

8) This is a rectangle, so the area is b * h = 10 * 2 = 20 in²

9) This is a square, so the area is s² = 9² = 81 ft²
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Rosa earns $120 per week tutoring math. Each week, she puts $36 from her paycheck in her bank account to save for college. Rosa
natita [175]

Answer:

36/120 x 100

= 30%

..............

3 0
3 years ago
Equivalent to 15x + 3?<br> A. 15(1x + 1)<br> B. 5(3x + 1)<br> C. 3(5x + 1)<br> D. 2(15x + 3)
Reika [66]

Answer:

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

6 0
2 years ago
The speeds of vehicles traveling on a highway are normally distributed with an unkown population mean and standard deviation. A
Maksim231197 [3]

Answer:

The 90% confidence interval would be given by (60.09;69.91)    

We are 90% confident that the true mean for the speeds of vehicles traveling on a highway is between 60.09 and 69.91 miles per hour.

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X =65 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=9 represent the sample standard deviation

n=11 represent the sample size  

2) Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=11-1=10

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,10)".And we see that t_{\alpha/2}=1.81

Now we have everything in order to replace into formula (1):

65-1.81\frac{9}{\sqrt{11}}=60.09    

65+1.81\frac{9}{\sqrt{11}}=69.91

So on this case the 90% confidence interval would be given by (60.09;69.91)    

We are 90% confident that the true mean for the speeds of vehicles traveling on a highway is between 60.09 and 69.91 miles per hour.

3 0
3 years ago
Kerry has 5 metal and 3 wood
Ray Of Light [21]

Expression

(5+3)+(5x2)=p

Solution

18

(Step-by-Step)

In this expression we simply have to use basic PEMDAS (Parenthesis Equation Multiplication Division Addition Subtraction) Order.

We start by working out the parenthesis

5 + 3  and 5 x 2

First let's work out our metal and wood paperweights

5+3=8

Simple enough, we have 8 metal AND wood paperweights

Now we have to work out our glass paperweights.

We have twice as many glass as we do metal PW's  meaning we need to multiply the 5 metal paperweights by 2

5x2=10

This simplifies and boils our equation down to

8+10

simply solve and add the two and you have your answer

18

6 0
3 years ago
32.5 of what number is 12.48?
raketka [301]
I'm guessing 32.5 is the percentage.

32.5/100 = x/12.48

Cross-multiply:
100x = 405.6

Divide both sides by 100 to leave x alone.

x = 4.056
7 0
3 years ago
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