Jason sold half of his comic books and then bought eight more. He now has twelve. How many did he begin with ?

When can u say there is no solution for a system of linear inequalities? explain your answer and show with a system and graph

For the function, f(x) = -5x 2, find f(-4).

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?