Put -4 in place of x
-4 to the second power is 16 so it would be 16-(-12)= 28
9(2w−y)=21w−9y
First you multiply the numbers in the parenthesis by 9

subtract. 21w-18w=3w

add. -9y+9y=0

divide.

Final answer is 0.
Answer:
The official answer is {C} ive previously taken the test
Step-by-step explanation:
I have taken the test before hand.
Answer:
-3x - 7
Step-by-step explanation:
-3x - 6 - 1 = -3x - 7