Answer:
90+50x=y
Step-by-step explanation:
You can substitute how many sessions there is for x, which is the monthly sessions. Then you will bee able to find x, then y.
50x / 30/x i think
a 15000 !!! i just took the question
b 21000
8.5
4 + (6)(6)/8=
17/2 = 8.5
