In which situation do the quantities combine to make zero

What is the quotient of -3/8and-1/3?

For which pair of functions is (gof)(a)=|a|-2?

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).