If a map key says that 1" = 12 miles, how many miles are represented by 3.2"?

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

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).

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?