Write 20 in the form e^k

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).

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)

I’m really confused and need to learn this