(fill in the blanks)

1. a metric unit of mass that is equal to 1/1000 of a gram is called a
a) dekameter
b) milligram
c) millimeter

2. a metric unit for measuring length that is equal to 10 meters is called a
a) dekameter
b) milligram
c) millimeter

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 =