Does anyone know how to do this i am not sure how to solve this ! !

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.

What is the following product? sqrt 30 • sqrt 10

1.5x + 0.2y = 2.68 1.6x + 0.3y = 2.98 0 the lines are parallel. the lines overlap at all points. the lines intersect at (1.6,1.4). the lines intersect at (3.1,0.5). which statement describes the graph of the system of equations below