Answer:
Class 8 has 27 and class 7 has 40
Step-by-step explanation:
8th (r) class has 13 fewer than 7th (x).x -13 = rTotal for both classes = 67 r + x - 13 = 67r + x = 8080 divided by two = 40 (per class)40 - 13 = 27
a = 5, b = -12
By basic factoring, you get 9 - 12i + . Since is simply -1, the expression evaluates to 9 - 12i - 4, which is 5 - 12i.
area = length of the base x height
height = 9cm
length of the base = 11cm
area = 9 X 11
area = 99