The up one is example how to do question one

Find the values of y: 3y^3(y^2+ 2/3y)=0

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'