Which set of ordered pairs represents a function? [(3,-3), (3,-1), (3, 3), (3, 6)}
{(1,2), (2, 4), (3, 3), (2,5)}
{(1,4),(2,4),(3,4),(5,4)}
{(-3,-3).(-1,-4).(-2,-1).(-1,-5)}

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?