3. Which of the following situations combine to make zero?
A. The temperature falls 10 degrees below zero and then rises to 10°F.
B. A friend borrows $20 and promises to return double the amount.
C. A start-up business has income equal to its expenses.

Aline is perpendicular to another line m2= (-1/m1), where m1 is the slope of the original line and m2 is the slope of the perpendicular line. which of the following equations represents the line that passes through the point (-2,1) and is perpendicular to the line below?