exam Maths Puzzle Numerical Ability

How do you figure out if A and B are supplementary if angle A measures 3/8x+50 and angle B measures x+31? Need to find x.

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exam Other Question

(1.) Use rounding to estimate the product. 110.5 x 10.2



(2.) Use front-end estimation to estimate the sum. 5.312 + 3.726

thank you.
solpe = -4/5, passes through (2,-3)