3x-21=57
3x=21+57
3x=78
Divide by 3
X=26
Answer:
A= 1,0 B=0, -3 C=-6, 5 D= -3, -5
Answer:
I donot know
Step-by-step explanation:
l donot know you are question
Answer:
12.
Step-by-step explanation:
Average rate of change = (value of the function when x = 9 - value when x=3)
/
(9 - 3)
= f(9) - f(3) / (9-3)
= (9^2 - 3^2) / (9-3)
= 72 / 6
= 12.