5. Determine the average rate of change of f(x)=6 cos(2x) – 4 on the interval [pi/4,pi]

i belive those are the ones that are under 90 degreese.

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram

so the rectangle is 80cm (area)

now to find the area of a triangle.

base times height.

4 times 8.

your answer is 96cm.

hope this .