Which of the following uses properties of operations to help find 34 x 12? (30 + 4) X (10 + 2)
30 x 4 x 10 x 2
30 + 4 + 10 + 2
34 + 12

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).