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Varvara68 [4.7K]
4 years ago
10

Amira is twice as old as her cousin Pam. Nine years ago, their age combined ages was 18. What are their present ages?

Mathematics
1 answer:
Katyanochek1 [597]4 years ago
4 0
Okay so they were both 9, nine years ago because 9 plus 9 is 18. 
They would both be 18 in the present age im pretty sure?
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/viewform?hr submission=Chclk4feKBIQ.
Gennadij [26K]

Answer:

c) .22

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

In this question:

\sigma = 2.5, n = 500

Then

M = z*\frac{\sigma}{\sqrt{n}}

M = 1.96*\frac{2.5}{\sqrt{500}}

M = 0.22

5 0
4 years ago
Solve the equation.<br> +8+3x=X-6<br> Ox=-18<br> Ox=-14<br> Ox=2<br> Ox=4
professor190 [17]

Answer:

x=-7

Step-by-step explanation:

8+3x=x-6\\\\8+3x+6=x-6+6\\\\8+3x+6=x+0\\\\(8+6)+3x=x\\\\14+3x=x\\\\14+3x-3x=x-3x\\\\14+0=x-3x\\\\14=(1-3)x\\\\14=-2x\\\\\frac{1}{2}(14)=\frac{1}{2}(-2x)\\\\7=-x\\\\-(7)=-(-x)\\\\-7=x\\\\x=-7

7 0
3 years ago
Need help immediately <br> What is the equation of the line shown?
nirvana33 [79]
Y=2x+4 its in the y=mx+b
7 0
3 years ago
The sum of three numbers is 74. The third number is 2 times the first. The second number is 10 less than the first what are the
Korolek [52]

Step-by-step explanation:

let the 1st number be x

given,

2nd number = 10 less than 1st number = x - 10

3rd number = 2 times the 1st number = 2x

their sum = 74

a/q,

x + x - 10 + 2x = 74

after solving the equation,

→ x + x - 10 + 2x = 74

→ 4x - 10 = 74

→ 4x = 74 + 10 = 84

→ 4x = 84

→ x = 84/4 = 21

therefore,

1st number = x = 21

2nd number = 10 - x = 21 - 10 = 11

3rd number = 2x = 2 × 21 = 42

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7 0
3 years ago
5. Tamara spent $164 on
elena-14-01-66 [18.8K]
You need to subtract 200 from 164 which is 36
6 0
2 years ago
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