Answer:
the area is 60 square units
Step-by-step explanation:
Area = (base x height) / 2
from class 1 to 2 is 10 units
from class 2 to 3 is 12 units
10 x 12 / 2
10 x 12 = 120
120 / 2 = 60
Answer:
the answer is 120 I think. hope this helps!!!
X^2 + 20x + 13 = 0
x^2 + 20x = -13
(B/2)^2 = (20/2)^2 = 10^2 = 100
x^2 + 20x + 100 = -13 + 100
(x + 10)^2 = 87
