exam Maths Puzzle Numerical Ability

Solve and graph the solution set. 4x + 8 > 3x + 16, the 9 on the last question was a mistake.

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exam Other Question

While on vacation,Allison noted that a $5.50 breakfast actually cost her $5.83 because of sales tax. what is the sales tax? evaluate each expression.

This is the problem I need help with:
((( (a/b)^2 + b^3 for a= 24 and b= -6)))