Question

A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

How many people who became members of the site that month were between 30 and 40 years of age?

112

288

360

432

Answer 1

All you have to do is to isolate your x....

Answer 2

?

Answer 3

What you do to one side, you do to the other!

SO!

x-0.8x = 0.8x-0.8x+72

.2x = 7x

Find x.

Answer 4

ahh!! .2x = 72***************** My bad

Answer 5

so freakin lost

Answer 6

is it a?

Answer 7

288

Answer 8

ITS THE SECOND ONE

Answer 9

You have x's on both sides. What you want, is to have x's ONLY on one side!

There is a rule that you can do anything to both sides, it will still be the same.

FOR EXAMPLE:

4=4 divide bth sides by 4

1=1

OR

3=3

3-1=3-1
2=2

THIS SAME RULE APPLIES HERE

Answer 10

yay another medal lol

Answer 11

No, it's not a

Answer 12

It's not b....

Answer 13

who's right?

Answer 14

It's c)

Answer 15

72/.2 = 360

Answer 16

u sure?

Answer 17

I'm not 99% sure, I'm 110% sure. I've done this for years!

Answer 18

You substract 0.8x from both sides so then it becomes

0.2x = 72

Then divide 72 by 0.2

72/0.2 = 360

Answer 19

ty

Answer 20

wowo its B

Answer 21

And how did you get b?

Answer 22

What I thought.

Answer 23

Lol, wow.

Answer 24

If I could, I'd give ya all a medal.

Answer 25

;)

Answer 26

You can, you give it , tanke it back, give it to someone else, etc.