exam Maths Puzzle Numerical Ability

List all of the possible rational zeros of f(x)=3x^5-7x^3+2x-15.

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exam Other Question

How do I do this again. Please help?Please.
Solve.

x/7-1/2= x-11/2 Solve for x and y

2/3-2yi=2x+4/5

I was doing okay with my homework and then I ran into this one and was lost. Thank you for your help.