40 - 12 = 28
28 / 40 = 0.7
0.7 * 100 = 70%
The percentage decrease is 70%.
Answer:
f(3) = -43
Step-by-step explanation:
alright so all you have to do is substitute x with 3 so it gonna look like
-(3)^2-9(3)-7= f(x)
now you just have to solve
-9-27-7=f(x)
f(x)= -43
The independent variable isn't affected by anything and can't change, and the dependent varible relies on the independent variable to decide what it is.