Please help need no will give brainlest What is different about multistep equations compared to 2 step equations?

How do i do this? i don’t understand

What additional information could be used to prove abc =mqr using sas? check all that apply.

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.