At an assembly 4 out of the first 10 students who entered the gym were carrying a backpack. Based on this information, if 800 students were at the assembly, how many students could be expected to be carrying a backpack?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Jan accidently ran 7 minutes longer than he was supposed to. write an expression for the total amount of time jan ran if she was supposed to run m minutes

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)