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What is the square root of 45? (step by step working plz)

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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).