Answer:
I think it would be 87.5 as an average between 85 and 90.
Step-by-step explanation:
Base = Height, Let them be x.

Solve quadratic equation:
x=6, x=-2(rejected because base and height is positive)
6x6/2 =18
Answer:
The list of prime number would probably start with 1 ( 2, 3, 5,7)
Answer:
(x+1)²= 49, the answer is B
Step-by-step explanation:
x² + 2x = 48
x² + 2x + (2/2)² - (2/2)²= 48 --[what we are trying to do is to complete a square by adding (2/2)² - (2/2)²]
(x+1)²= 49, the answer is B
2, 4, 6, 8, 10, 12
difference is 2