Determine if the statement is true. if an angle is acute, then it's measure is 45*. i think it's false. is that correct?

Evaluate the following expression 1/3^2

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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).