Which statements about this prism partially packed with unit cubes are true? Check all that apply.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Which of the following best describes the figure?

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.