Hello all, I'm currently in an online math course do not understand any of these review questions. We were pretty much just told to do these without any guidance, example, or review. I was wondering if someone could help me with these problems!

1. 9(3x+2)-10x=12x-7<--solve for x

2. One number is 7 less than another. If four times the smaller number plus 2 times the larger number is 62, find the two numbers.

3. Solve each literal equation for the indicated variable:

I-Prt (for r)

A=1/2 (h(B+b) (for B)

4. Solve each literal equation for the indicated variable:

V=LWH (for H)

D=(c-s)/n (for s)

If someone would be able to solve them and explain a little bit about them I would appreciate it, these are the only questions i've been having trouble on throughout the night