Please answer these please I don't know this

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two