Hi guys im stuck on this maths question

(2/5)^-3

List the sides of δrst in in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°

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

Find the value of x. give reasons to justify your solutions! h ∈ ig