exam Maths Puzzle Numerical Ability

I have a question that states: find all real zeros of the function:
a)f(x)=-7x^4+343x^2
b)f(x)=x^4-16x^2+15

I have no idea how to do these

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how many ounces of a 30% alcohol solution must be mixed with 40 ounces of an 80% alcohol solution to get a 70% solution? In a certain mill the cost C in thousands of dollars of producing x tons of steel is given by: C=0.3+3.5

The revenue R in thousands of dollars from selling x tons is given by: