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4 years ago

HELPPPPPPP!!!!!!!!!!!!!

Mathematics

2 answers:

marshall27 [118]4 years ago

8 0

Calculate the area of the entire circle first.

A = 3.15 (r) ^2

A = 3.15 (2.25) ^2

Now calculate the area of the white circle

Take the radius - 1.5 to calculate the radius of the white circle

A = 3.15 (.75)^2

Now subtract your two answers

Sonbull [250]4 years ago

4 0

14.23 is your answer!!!!!!!

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Can someone who knows geometry help me

Anuta_ua [19.1K]

3) . Ddraw the radius to the right side of the chord. So you formed a right triangleNow let's apply Pythagoras

3.6² + 5.5²= x² ==> x = 6.57 ≈ 6.6

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x² = 133/4 & x =5.766≈ 5.8

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7 0

3 years ago

Which inequality is represented by the graph below?

4vir4ik [10]

I don’t no this I’m sorry

6 0

3 years ago

The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medici

Ilia_Sergeevich [38]

Answer:

$4600-1.646\frac{800}{\sqrt{1800}}=4568.96$

$4600+1.646\frac{800}{\sqrt{1800}}=4631.04$

We are confident at 90% that the true mean for the amount spent on medicines is between (4568.96 and 4631.04)

Step-by-step explanation:

Information given

$\bar X=4600$ represent the sample mean for the amount spent on medicines

$\mu$ population mean

s=800 represent the sample standard deviation

n=1800 represent the sample size

Solution

The confidence interval for the true population mean is given by:

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

We can calculate the degrees of freedom with:

$df=n-1=1800-1=1799$

We know that the Confidence level is 0.90 or 90%, the value of significance is $\alpha=0.1$ 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(0.05,1799)".And we see that $t_{\alpha/2}=1.646$

Replcing in the formula for the confidence interval we got:

$4600-1.646\frac{800}{\sqrt{1800}}=4568.96$

$4600+1.646\frac{800}{\sqrt{1800}}=4631.04$

We are confident at 90% that the true mean for the amount spent on medicines is between (4568.96 and 4631.04)

6 0

3 years ago

X+2y=8 graph it please

denpristay [2]

Answer:

Hope this helps.

Step-by-step explanation:

4 0

3 years ago

PLS HELP ME ASAP ON 12 (SHOW WORK!) + LOTS OF POINTS!!

Rom4ik [11]

The first thing you do is cross multiply which is 3/4x=48 (3/4 = 0.75). Therfore you divide each side by .75. The left side cancels out. For the right side you divide 48 by .75 and gives you 64. x=64

6 0

3 years ago