Please help I will mark brai list if u are right

Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Write the rational number in lowest terms 99/-15