Use the elimination method to solve the system of equations. Choose the correct ordered pair. 4x + 7y = 60
-4x + 7y = -4

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

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?

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180