Assume that C (x) is in dollars and is the number of units produced and sold. For the total cost function C (x) = 0.01x² + 0.5x + 30, find deltaC and C' (x) when x=90 and deltaX=1.

Derive the equation of the parabola with a focus at (-7, 5) and a directrix of y = - 11

Which of the following uses a nonrenewable energy source?

Which decimal number is 17/22 equal to?

Katie works as a waitress and records her monthly tips in the table shown below. If Katie decided not to work the month of November, how would her five month average compare to her six month average for monthly tips?

Which equation represents a parabola that has a focus of (0, 0) and a directrix of y = 4? x2=-8 (y-2) x2=-2y x2=-8y x2=-2 (y-2)

Solve the following word problem. A man travels from Town X to Town Y at an average rate of 60 mph and returns at an average rate of 50 mph. He takes a 1/2 hour longer than he would take if he made the round trip at an average of 55 mph.

A cell splits in half every 15 minutes. How many cells will there be in 150 minutes (2.5 hours) ?

If the height of a cylinder was tripled, but the area of the base remained the same, what would happen to the volume?

Some cell phone users have developed brain cancer. Should all cell phones come with a warning label explaining the danger of using cell phones?""

Use the distributive property to solve 4 (2x + 9)