exam Maths Puzzle Numerical Ability

Can you please help me solve: At the Gourmet Grocery Mart, a 575g can of green beans costs 39 cents and a 810g can of the same product costs 52 cents. Which is the better buy?

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f(x)=-x^+4x-3




Graph y=f(x)

Show x-and y-intercepts and vertex on the graph

I actually thought y was f(x) from how it was explained in class, where am I off on this?
how do you solve? 5x to the power of 5 + 10 to the power of 2 - 8x