exam Maths Puzzle Numerical Ability

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

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exam Other Question

Problem is:

x - x^2/3 = x^1/3 (??) Fill in the ??. The object is to find the equation that when multiplied by x^1/3 would give the result of x - x^2/3.

I know this has to be something simple, but my brain is fried. Hoe many pounds of hamburger that costs 1.60 per pound must be mixed with 70 pounds of hamburger that costs 2.10 per pound to make a mixture that costs 1.70 per pound.