Question

3. Which of the following is a solution to the equation 16= 4x-4?
a.-5
b.-4
c.5
d.16

please help. I'll give a medal + fan I wanna know how

Answer 1

16 = 4x - 4 --- we want to get the 4x by itself, so add 4 to both sides
16 + 4 = 4x - 4 + 4 --- combine terms
20 = 4x -- now we want x by itself, so we divide both sides by 4
20/4 = 4x/4
5 = x

you can even check your answer by subbing it into the problem
16 = 4(5) - 4
16 = 20 - 4
16 = 16 (correct)

any questions ?

Answer 2

@Mimi_Styles its 5

Answer 3

hmm, I kinda understand it now. and yes I have a few more questions :)

Answer 4

ask away :)

Answer 5

Are you talking to me? Thats like 8th grade math dude..hahah

Answer 6

4. An art student wants to make a model of a rectangular classroom. The length of the classroom is 2.4 times its width. The length of the student's model is 42 in. What should the width of the model be?

a. 17.5in
b. 20.5 in
c. 83. 6in
d. 100.8in

Answer 7

and um.. sorry if I didn't get it. I never really understood math like that. I was always horrible at it...

Answer 8

._.

Answer 9

L = 2.4W

L = 42

42 = 2.4W -- divide by 2.4
42/2.4 = W
17.5 = W

Answer 10

ohhhhhh I see now ^_^

Answer 11

good to hear :) Sometimes these problems can be confusing and it helps to have someone walk you though them. Do you have any more questions ?

Answer 12

yes I do. if that's okay with you haha

Answer 13

1. Which of the following is an example of an open equation?

a. 5x+7=12
b. 12+(-8)= 4
c.25= 5(5)
d. 8+0=0

(I kinda forgotten what a open equation was... oops :(..I feel so dumb)

Answer 14

an open equation, if I am not mistaken, is one where there is an unsolved variable. Once you sub in the number for the variable, it is no longer open.

Your open equation is : 5x + 7 = 12 because we do not know what x is.

Answer 15

ohhh, okay. may I ask more questions?

Answer 16

you may....lol

Answer 17

yay! *does a happy dance* thankies :)

Answer 18

2. Which of the following equation has 3 as a solution?

a. -2b= 6
b. 4a- 5= 12
c. 5y= y+8
d. z- 15= -12

:D

Answer 19

ask when ready

Answer 20

Its D

Answer 21

but why ? like why would it be D?

Answer 22

Because you can just substitute 3 in for z Then it would be 3-15=-12
And 3-15=-12. What grade are you in?

Answer 23

>_> <_< -hides in a dark hole-

Answer 24

I was just asking... ._.

Answer 25

OMG..I am soooooo Sorry if that sounded rude..I wasn't going for the rude sound!!

Answer 26

And are you the one with the blonde hair in your profile picture?