An environmental survey contained a question asking what respondents thought was the major cause of air pollution in this country,
a) "automobiles,"
b) "factories,"
c) "incinerators."

A; automobiles

Step-by-step explanation:

According to the United States Environmental Protection Agency, automobiles constitutes the major cause of air pollution in the country. Automobiles accounts for more than half of the total air pollution in the United States.

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168