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slava [35]
2 years ago
7

Consider the circles A, B, C, and D. SOMEONE PLEASE HELP ASAPPPP THANKS!!!

Mathematics
2 answers:
Zepler [3.9K]2 years ago
8 0

Answer:

a= d and b= b

Step-by-step explanation:

circumference falls hand and hand with diameter and radius

a has a circumference of about 301 inches

b is about 62 inches

c is about 75 inches

d is about 314

ivanzaharov [21]2 years ago
4 0

Answer: first question = d and second question = b

Hope this helped

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Jack's age is three years more than twice his younger brother Jimmy's age If the sum of their ages is at most 18 find the greate
UNO [17]
J + 3 + 2j ≤ 18
3j + 3 ≤ 18
3j ≤ 15
j ≤ 5 
jimmy's age is 5 years or less
6 0
3 years ago
Simplify the expression to a + bi'form:<br> (1 - 5i)(5 +6i)
lions [1.4K]

(1 - 5i)(5 + 6i) \\  = 5 + 6i - 25i - 30 {i}^{2}  \\  = 5 - 19i + 30 \\  = 35 - 19i

I hope I helped you^_^

7 0
2 years ago
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What is the area of the triangle in square yards?
True [87]

Answer:

DON'T LOOK AT THE PICTURE!!

Step-by-step explanation:

3 0
2 years ago
Which of these points are on a line that has a slope of -3?
Ira Lisetskai [31]
Simple....

using the formula \frac{ y_{1}- y_{2}  }{ x_{1}- x_{2}  } to find slope....

1.)  (9,2)(4,3)

\frac{2-3}{9-4}= -\frac{1}{5} (No)

2.)  (9,2)(3,4)

\frac{2-4}{9-3} = -\frac{2}{6} =- \frac{1}{3} (No)

3.)  (2,9)(3,4)

\frac{9-4}{2-3} = \frac{5}{-1} =-5 (No)

4.)  (2,9)(4,3)

\frac{9-3}{2-4} = \frac{6}{-2} =-3 (YES!)

Thus, your answer.
3 0
3 years ago
The proprietor of a boutique in New York wanted to determine the average age of his customers. A random sample of 25 customers r
jolli1 [7]

Answer:

28-2.064\frac{10}{\sqrt{25}}=23.872    

28+2.064\frac{10}{\sqrt{25}}=32.128    

So on this case the 95% confidence interval would be given by (23.9;32.1)  

Step-by-step explanation:

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=28 represent the sample mean

\mu population mean (variable of interest)

s=10 represent the sample standard deviation

n=25 represent the sample size  

Solution to the problem

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=25-1=24

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,24)".And we see that t_{\alpha/2}=2.064

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

28-2.064\frac{10}{\sqrt{25}}=23.872    

28+2.064\frac{10}{\sqrt{25}}=32.128    

So on this case the 95% confidence interval would be given by (23.9;32.1)    

7 0
3 years ago
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