Please help!!! I can’t figure this out!

Answer:
a) 3.60
5.20
7.20
3.2 + .4M
b) at most, 42 minutes if only have $20
Step-by-step explanation:
minutes = 1; 3.2 + (.4)(1) = 3.60
minutes = 5; 3.2 + .4(5) = 5.20
minutes = 10; 3.2 + .4(10) = 7.20
minutes = M; 3.2 + .4M
b) 3.2 + .4M ≤ 20
.4M ≤ 16.8
M ≤ 42
at most, 42 minutes if only have $20
Answer:
in the question sorry
Step-by-step explanation:
I am going to make an equation using y=mx+b alright! y=0.40x+3.20
so the first one is 3.6
the second one is 5.2
the third one is 7.2
the last one is im not sure tbh i think you make one up
part b. is 42 mins