Question

i need answers for this if you know.
...solve for p.
3(p+q)=p
A. q=- 2 over 3p
B. q=- 3 over 2p
C. p=- 2 over 3q
D. p=- 3 over 2q

2. solve for b, then find the value of b when a=3.
4a=2b-7

A. -9 over 2
B. 5 over 2
C. 19 over 2
D. 17
solve for r.
d=rt

A. r=dt
B. r= t over d
C. d over t
D. r=d-t

find the width of a rectangle with the perimeter of 90 and a length of 15.

A. 90
B. 15
C. 45
D. 30
please and thank you