(URGENT) Erythropoietin, a hormone that causes red blood cell production, is secreted by the

For each proportion find the unknown number x 1/5/8=×/15

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?