exam Maths Puzzle Numerical Ability

solve -m squared= -81

(i couldnt figure out how to make the square symbol)

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exam Other Question

930-μ = 1.2816
______
100

I am having a brain cramp and cannot remember how to solve for μ in this problem. I have the answer from my worksheet (801.8448) but cannot remember how to do the work!!

Thank you
For each situation, find the value of x and the measure of the indicated angles
angle PXR appears to be 55 degrees
angle RXT appears to be 125 degrees
M(anglesign)PXR=3x,m(angle