book Maths Puzzle Numerical Ability

I have 2 problems that I am having trouble starting.
1. solve the inequality x^3-7x+6 > 0

2.a real solution for the equation x^3+5x-8=0, correct to the nearest tenth, is x=

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book Other Question
im doing "zero and negaive exponents"...
in need to "use the quotient of powers property to simplify the expression."
1. 5^6/5^3



this is one i did, i dont know if its right
ex.
m^5/m^11= 1/m^-6= m^5+m^6/m^11= 1 Find the perimeter of each rectangle with the given dimensions.

L - 3 3/8 in

W - 1 3/16 in