In January, a bookstore sells 450 books, but in February, it sells only 300 books. What is the percent of change from January to February? 50%
-33.3%
-50%
66.7%

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20