Which matrix represents the system of equations shown below?
8x-3y = 9
2x + 5y = -7

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?