Need help quick thank you in advance

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).

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Which function has the domain x> -11