Answer:
the answer is 5 and u know the rest
Answer: 21
Step-by-step explanation:

Substitute the value of z into the expression:

im gonna say d not sure, 10% is 5 dollars off tho
Answer:
16
Step-by-step explanation:
Substitute (7) into the equation.
y= 1/4(15-(7))^2
Answer:
B.) 
Step-by-step explanation:

A negative and a negative equals a positive. Remove parentheses and simplify

Done.