What is the sum of the first 45 terms of the following sequence? 20, 18, 16, . .
a. 1,080
b. 1,420
c. 1,530
d. 1,980

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

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.