What was the first error that Andrea made

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Explain how you can use the associative property to evaluate (7x50)x4.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.