-3|9x-7|=2 Find the answer for x

Write a function for a rotation 90 degrees counter clockwise about the origin, point 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.

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?