book Maths Puzzle Numerical Ability

find both complement and the supplemant of the angle measures: 1) 150, and 2) 9

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book Other Question

I have an equilateral triangle with an area of 30 square centimeters. I need to find the base and height of the triangle. ((( x^4 -x^2 -12 = 0)))) Can you please help me with this problems