Find the perimeter of a triangle with sides 2x - 3y, x2 + y and 2x + y units

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.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.