50 points and brianliest: which of the following expressions is in its simplest form?

8m + 4n - 5mn + 7
15bd + 5 - 2b + 3d + 23
xy + 6xy2 - 7 + 12xy
35 - a2 - ab2 + ab - 2ab2

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.

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation

You are shooting hoops after school and make 152 out of a total of 200. what percent of shots did you make? what percent did you miss? show proportion(s).