Samantha sends her son, Barry, to a preschool center on certain days. The cost of preschool is $45 per day along with a fixed monthly charge
of $70. Last month, Samantha paid a total of $880 to the preschool center. Let d represent the number of days Barry spent at the preschool
center last month.
Which equation represents this situation, and how many days did Barry attend preschool last month?
A
810 = 45d, 19 days
B. 880 = 70d-45; 21 days
C. 880 = 90d +45; 9 days
D. 880 - 45d + 70; 18 days