exam Maths Puzzle Numerical Ability

If f(x)=x^3-2x^2-7/x^6-2x^5+6x^2-4 how many vertical asymptotes does it have. I try to factor the bottom but have no luck am I missing something?

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exam Other Question

Please help me solve this problem;m<2=2x+3 and m<4=4x-7 Your piggy bank has 25 coins in it; some are quarters and some are nickels. You have $3.45. How many nickels do you have? (I know you can figure this out by trial and error, but you must write the equations and solve.)