Answer:
2.66
Step-by-step explanation:
0<r<6
the least number of ride he can go on is 0 which is none and the most is 6 because 15/2.50=6
3/9 is your answer. 3+6=9 and there are 3 red marbles.
Simply put, its a LONGER way to do division. You take a longer time on showing the work.
The solution for the system of equations are:

Attached is the graph of lines y=3x-2 and y=-2x+5.