What are the steps, in order, needed to solve - 5 = 20?

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

Tan198=asin164=? how to solve this? ?