I need help asap. If you could answer both, I'd be grateful. I'll give a thumbs up, thanks. Only a brief explanation is needed.

If n = 4N, and f(x) = v? 18769 x2 , what is the absolute difference between the left and right endpoint Riemann sums on [-132 13?]? Round your answer to 4 decimal places. Answer: An icosahedron is a Platonic solid with a surface that consists of 20 equilateral triangles. By what factor does the surface area of an icosahedron increase as the side length of each triangle doubles from a unit to 2a units, if a = 2.3? Round your answer to three decimal places. Answer: 4