The half-life of a radioactive kind of carbon is 20 minutes. If you start with 480 grams of it, how much will be left after 60 minutes?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

P= price tax is 4% added to the price. which expression shows the total price including tax?

Abox of chocolates cost $7 which equation relates the number of boxes sold parentheses x parentheses and total cost of the boxes sold parentheses y parentheses