Which of the following is not a source of air pollution related to human activities? a. gasoline b. garbage c. forest fires d. radon

Radon

Explanation: Radon is a radioactive chemical element. It occurs naturally in the form of colorless, odorless, tasteless noble gas.

It is formed in between the decay of the uranium and thorium that is found in the Earth. The decay of the radon particles produces many daughter radons.

It does not contributes to air pollution like that of gasoline, burning of garbage and forest fires.

answer; i believe that the correct answer is (light);

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)