All categories

4 years ago

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

1 answer:

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?

You might be interested in

/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. +8+3x=X-6 Ox=-18 Ox=-14 Ox=2 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 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

hope this answer helps you dear......take care and may u have a great day ahead!

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