Answer:

Step-by-step explanation:
Recall that
.
Therefore,
.
Answer:
x^2-12x+27
Step-by-step explanation:
(x-3)(x-9)=x^2-3x-9x+27=x^2-12x+27
Answer:
18
Step-by-step explanation:
you can do 12/2 to get 6 (the scale factor) and then multiply 3 by 6 and get 18
Answer:
27 years
Step-by-step explanation:
21 × 2 = 42
42 - 15 = 27
Kindly refer to attachment for solution.
Hope it helps ^_^