Find the unit rate costs $25.80 for 5 items

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

To convert celsius temperatures to fahrenheit, you can use the expression (c + 32). tom says that another way to write this expression is c + 32. what error did tom make?

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.