exam Maths Puzzle Numerical Ability

Find a rational zero of the polynomial function and use it to find all the zeros of the function.

f(x) = x to the third power + 2x to the second power - 9x - 18

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exam Other Question

The measure of an interior angle of a regular polygon is given. Find the number of sides in each polygon

1.) 120 2.)150

I am at a complete lost here, could someone help me please? Where would I start?
simplify
m^3*y^6*m^2