How would you do this problem 1/4 (8-6x+20)

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).

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

Find the ratios of the corresponding sides