I think it is B but im honestly unsure.
Hey there!

Firstly, we are going
add 
on each of the sides that we're working with. like ↓

This gives us

(if you are wondering how we got the out come of

it is because I
added 
Now
multiply 
on each of your sides
Cancel the first set and you will find the value of

Good luck on your assignment and enjoy your day ~
Answer:
w = (p - 21)/2
Step-by-step explanation:
Rearrange the equation so that it is equal to w.
p = 21 + 2w
p - 21 = (21 + 2w) - 21
p - 21 = 2w
(p - 21)/2 = (2w)/2
(p - 21)/2 = w
w = (p - 21)/2
It’s a positive correlation I’m pretty sure.
A. 1 pound of cherries costs 2.50
B. Yes it is constant
C. I believe that you would put cost on the y and lbs on the x
E. 5 lbs of cherries = 2.50 x 5 = $12.50