Justin receives $15 and puts it into his savings account. he adds $0.25 to the account each day for a number of days, d, after that. he writes the expression 15+0.25(d−1) to find the amount of money in his account after d days. which statement about his expression is true?
a. it is the sum of the initial amount and the additional amount after d days.
b. it is the product of the initial amount and the additional amount after d days.
c. it is the sum of the initial amount and the number of days, d.
d. it is the difference between the initial amount and the additional amount after d days.