Answer:
b. x+1..........................
77.5d + .14m
m = 425
.14 * 425 = 59.5
77.5d + 59.5 ≤ 230
77.5d ≤ 170.5
d ≤ 170.5/77.5
d ≤ 2.2
if they only take payment for whole days, he has 2 whole days
The first blank on the left side should be 0 I think
For number 5. X=12.5 and for number 6. X=4
Hope this helps :)