The red line below is parallel to which of the following?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y