Can someone me i’m stuck on this question asap can you rewrite a sine as a cosine function and vice versa when describing a general sinusoidal graph? explain.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

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.