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What is the exponential function

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).

What are the exclude value of mn+3m

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6