Any geniuses here?

[.sarah]

Well I can tell you the answer to the first and last one and then maybe explain to you how I got it??

Okay

b-3=2(a+4) then solve for b

Distribute first, so:
b-3=2a+8

Get b alone by adding 3 to both sides:
b=2a+11

So for the first question b. is the answer. I'll try more if you are still stumped, I am eating dinner right now.

Ah, thanks! I didn't do the distributive and that was the problem.

[boscibo]

I edited out the answer I had posted, I didn't read you didn't want the answer!

[.sarah]

I edited out the answer I had posted, I didn't read you didn't want the answer!

It's fine. What I didn't want was someone posting only the answer. Even the tutors and teachers would explain it and most likely give the answer ... it's just too late to call them now

[Jessika]

ok well you already have the first, so here's the last:

(d/5) x 7

BECAUSE:

you need to find out the price for each individual book, so you would divide the price you paid (d) by the number of books you bought (5). Then you would multiply that answer by 7 to find out how much seven books would cost. Therefore:

(d/5) x 7

EXAMPLE:

Let's say I paid $20 for 5 books. I would need to find out how much I paid for each book, so I would divide 20 by 5 (which is, of course, 4). $4 is how much you paid per book, so therefore to find the price of seven books you would multiply seven by four, which equals 28

so basically:

(20/5) x 7 = 28

I really hope I explained that well

EDIT: WHAT!! You eliminated the answer?? That means it wasn't correct??

Well darn it then!! It works, I can't see how its wrong! O_o