I need to figure out the angle of m angle h

Find the value of x. give reasons to justify your solutions! h ∈ ig

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 missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?