What is the product of (4i) and (4+i)

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.

What are two numbers that have a sum of 15?

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?