Is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer.
a. radon
b. carbon monoxide
c. hydrogen
d. nitroge

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.