exam Maths Puzzle Numerical Ability

Hi, I'm not sure if this is in the right category. I need to simplify the following: Thank you for your assistance!

1. 8(x + 4) - (x - 5)

2. 28((1/4)z + (1/7))

3. 3

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exam Other Question

I am having trouble setting these problems up into equations.

Given
S=Supply (in thousands) S=.09x^2-.45x+3.5
D=Demand (in thousands) D=15-.5x
X=price

What should the pric Divide and simplify rational expression 3x^2+7x-6 over 3x^2+x-2 divided by x^2+7x+12 over -4x^2-20x-16