Plz help me plz

In the past, professional baseball was played at the astrodome in houston, texas. the astrodome has a maximum height of 63.4 m. the height of a baseball t seconds after it is hit straight up in the air with a velocity of 45 ft/s is given by h = -9.8t2 + 45t + 1. will a baseball hit straight up with this velocity hit the roof of the astrodome? use the discriminant to explain your answer.

Which expression is equivalent to 2x^2+7x+4?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap