Answer:
60/13
Step-by-step explanation:
Use area.
5 x 12 x 1/2 = h x 13 x 1/2
13/2 h = 30
13 h =60
h = 60/13
32
f(x) = 20x² - 18x - 25
f(-1) = 20(-1)² - 18(-1) - 25
= 20 + 18 - 25
= 13
18
3 x 3 = 9
9 x 2 = 18