Witch tool would you use to measure how long it takes a toy car to go down a ramp? stopwatch scale meterstick ruler

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).

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Does the point (1, sqrt 7) lie on circle shown.