exam Maths Puzzle Numerical Ability

I had problems with this on my GED and i needed to know can you help me with so that i can get the 10 points i need to get my GED?

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exam Other Question

Simplify:


Add: (3x to 2nd power - 5x to 3rd power - x) -2(x to 3rd power - 3x + 4)

Multiple (3x -5)(7x -5)
f(x) = 5x + 21/c; f(x) = -38