exam Maths Puzzle Numerical Ability

A right angled triangle PQR is drawn such that QR is Hypotenuse, PQ is Base and PR is Perpendicular. Equilateral triangles are drawn on the sides of the right angled triangle PQR.

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exam Other Question

set up and splve in a triangle the measure of the first angle is twice the measure of the second angle. The measure of the third angle is 20 degrees less than the second angle. What us the measure of each angle? I dont know how to solve these problems completely.
1. 20x^4-12x^3+8x^2

2.6x^2+2x-20

3.5w^2-20

4.5y^4-405