exam Maths Puzzle Numerical Ability

Four of the angles of a pentagon have measures, 30, 60, 120 , and 165. Find the measure of the fifth angle. (5-2)180=540
30+60+120+165=375 540-375=165 I think the answer is 165

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exam Other Question
What are the solutions to, x^2-2x=0. For the equation X-2SQRTx=0 , perform the following:
a) Solve for all values of x that satisfies the equation.

b) Graph the functions y = x and y= 2SQRTx on the same graph (