A)pa=2•ab
b)ab=1/2•pa
c)pa=pb
d)2•pa=pb

7x+8y=-18, 4x-9y=-3 solve the system of equations

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.