pls could someone solve C and D? also brainliest to first answer (if correct)

Answer:
C = -10
D = -5
Step-by-step explanation:
so all you have to do is substiute and simplify
xy/y
we can take out the two ys because its multiplying
x = -10
x^2/y
(-10)^2/ -20
100/-20
-5
and for C we can check it by not removing the y:
-10(-20) / -20
200/-20
-10
Answer:
a. [tex]\sf 10[/tex]
b. [tex]0[/tex]
c. [tex]\sf -10[/tex]
d. [tex]\sf 5[/tex]