Answer:
Its A and B i beleive.
Step-by-step explanation:
You may use direct substitution to solve for x and y.
So, x=2 and y=4.
The inequality : 21d + 250×0.1 =<115
By solving the inequality, the value of d = 4.28 days i.e 4 days (Approx)
So i don't think the maximum no.of days will be 5.

Given y = f(x)
Substitute x = 10.

Therefore f(x) = 13 when x = 10
60 divided by 100 is 0.60. I hope this helps! :)