What is the lengths of AC

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

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2