Ava is trying to determine how much a delivery of 70 gallons of water will weigh. She knows that five gallons of water weigh 41.7 pounds.
(a) Determine how much a single gallon of water weighs, I. e. the pounds per gallon.

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).

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Which of the following contains a variable?