A coin collector is able to collect 5 coins each day. The collector has 5 coins on the first day, 10 on the second, 15 on the third day, and so on. Which expression represents the number of coins the collector has after d days?
a) d + 5
b) 5d
c) d^5
d) 5^d
The number of coins the collector has after d days can be found by adding the number of coins collected on each day. Since the collector collects 5 coins each day, the number of coins collected after d days is 5 * d, which can be simplified to 5d.
Therefore, the expression that represents the number of coins the collector has after d days is option b) 5d.
The expression that represents the number of coins the collector has after d days is:
b) 5d