Please help me with this question.

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

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 =