Whenever 2 line or intersect at 90 the 2 lines are said to be ?

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 =

10% of 1,900,000. show me how you got the answer

Which strategy is used by public health to reduce the incidence of food poisoning?