Angel bought 3 pens and 4 pencils for $4.25. Nioka bought 2 pens and 6 pencils for $4.50. How much is a pen? and a pencil?

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.