2. If 5/7a = 1/b-a, which of the following proportions is equivalent? A) a/b = 5/12
B) a/b= 5/2
C) b-a/a = 5/7
D) b-a/a = -7/5

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

There is an entrance to the computer room at point e which lies on ab and is 5 feet from point a. plot point e on the coordinate plane. find the distance from the entrance at point e to the printer at point e

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?