If X={…,1,2,3}, then which set is a proper subset of X? {…,1,2,3}
{2,3,4}
{−8,−10,−13}
{0,1,2,…}

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?