Write each sum as a product of the gcf of the two numbers 36 and 45

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If square root x = -7, then x= -49 true or false

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).