Find the slope given (-4,5) and (-8,-5)

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

The anwser cause i do not understand just plez