What is equivalent exponential expression for the radical expression blow

Given abcd ac=38 and ae=3x+4 find the value of x

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

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.