exam Maths Puzzle Numerical Ability

Given f(x) = 5x + 3, find f(0)

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exam Other Question

Factor the polynomial F(x)=x^4-8x^3=17^2+2x-24
I need to factor this and show the work any help is greatly needed.
The profit that the vendor makes per day by selling x pretzels is given by the function P(x)= -0.002x^2+1.4x-400. Find the number of pretzels that must be sold to maximize profit.