exam Maths Puzzle Numerical Ability

I am having a hard time breaking this one down.

x^4+X^3-8^2+x-6/x^2+1

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exam Other Question

if the cost of community colleges in 1992- 1993 was $1800 and it 2002-2003 it was $2200 what is the percent increase? and what is the euqation to solve a problem like this? 2. a bag of lawn fertilizer claims that it will cover 5,000 square feet of grass. If your yard is 27,500 square feet, how many bags of fertilizer will you need?