Which of the following functions has the greater initial value?

A plumber
charges $50 to
come out and
I look at your
plumbing issue
then charges
$30 per hour to
fix it

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).