exam Maths Puzzle Numerical Ability

How would you simplify this in exponential form, using only positive exponents,assuming all variables represent nonzero numbers?

x^9*x^-4/x^-2*x^-7

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exam Other Question

solve by using the quadratic formula

x^2+x-2=0
Amelia chose 3 cds that each cost $16. The sales tax on the three cds is $3.96. Write a direct variation equation relating sales tax to the price.