Ask question

Ask question

All categories

3 years ago

12

The sum of two numbers is five times their difference. If one number exceeds the other by 7, find the numbers.

1 answer:

Vaselesa [24]3 years ago

4 0

Hello here is a solution :

You might be interested in

What shape can you make with a square and a triangle

Sliva [168]

Answer: dimond

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

The angle measurements in the diagram are represented by the following expressions.

Rina8888 [55]

Answer:

since those 2 lines are parrelel that means the angles are the same so

8x+6=4x+38

minus 6

8x=4x+32

minus 4x

4x=32

divide by 4

x=8

Hope This Helps!!!

7 0

1 year ago

Read 2 more answers

Jeffrey has a dog that weighs 3 times as much as Sarah's dog. The total weight of both dogs is 64 lb. How much does Jeffrey's Do

Fiesta28 [93]

64×3=192 you can do 64+64+64 and you get 192

8 0

3 years ago

What is the distance between (2,7) and(4,2)

Leno4ka [110]

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

$d = \sqrt{ ({2 - 4})^{2} + ({7 - 2})^{2} }$

$d = \sqrt{ ({ - 2})^{2} + ({5})^{2} }$

$d = \sqrt{4 + 25}$

$d = \sqrt{29}$

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

4 0

2 years ago

If a light bulb manufacturing company wants to estimate, with 99% confidence, the mean life of compact fluorescent light bulb

Reptile [31]

Answer:

We need at least 217 compact fluorescent light bulbs

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.575$

Now, find 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.

How many compact fluorescent light bulbs need to be selected?

We need at least n bulbs, in which n is found when $M = 175, \sigma = 1000$

So

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

$175 = 2.575*\frac{1000}{\sqrt{n}}$

$175\sqrt{n} = 2575$

$\sqrt{n} = \frac{2575}{175}$

$\sqrt{n} = 14.71$

$\sqrt{n}^{2} = (14.71)^{2}$

$n = 216.5$

We need at least 217 compact fluorescent light bulbs

4 0

3 years ago

Read 2 more answers