Factor and solve to find roots x squared -x - 90 =0

Given this information, which expression must represent the value of b?

Select the best attribute for the angle pair formed by two parallel lines intersected by a transversal.

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais