Identify whether the equation represents an exponential growth or exponential decay function. 1. y = 1/4 (1/e)^-2x
2. y = (1/e)^4x
3. y = 2e^-x + 1

How do you do this?

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?