Use the substitute method to solve the system of equation. choose the correct ordered pair. X+y=3 or y=8

What's the difference between: x≥0 and nonnegative integer. ?

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 =

Which statements are true about additional information for proving that the triangles are congruent check all that apply