Answer:
OK here:
Explanation:
I assume the teacher is saying that you have (d) dollar coins and (f) five cent coins where d and f are unknown numbers numbers. So:
I also assume when the teacher asks how many coins the person has, it is the number of coins total where both a dollar coin and five cent coin count as 1.
a) d + f
b) 3d + f - 7
c) d + f + 25