The sum of the speeds of the two trains is 721.5 miles per hour. If the speed of the first train is 4.5 mph faster than the second train find the speech of each

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 =

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test