After chlorofluorocarbons were banned, which class of chemicals was used in their place? A. Carbon dioxide
B. Hydrofluorocarbons
C. Methane
D. Sulfur dioxide

Explain why Please.

Is an official language in every north african country

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.

Can you give an explanation of what medc and ledc are.