exam Maths Puzzle Numerical Ability

Using Multiplication First:
Use linear combinations to solve the system of linear equations.

9x - 3z = 20
3x + 6z = 2

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exam Other Question

Factor:
16x^2-49 I think I have the answer to this problem, but I am not sure. Can someone please check my work?

Given f(x)=5x^2-3x+1, find f(-2):

I got 27, is this correct?

Thank you for your help!