A doctor visits her patients during morning rounds. In how many ways can the doctor visit 6 patients during the morning rounds?

What is the value of  y  in the solution to the system of equations? x  +  y  =  12x  –  3y  =  –30a. –8b. –3c. 3d. 8

Just tell me how to set up the equation.

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.