QUESTION 12 How many nine-digit ZIP code numbers are possible if the first digit cannot be a three and successive digits cannot be the same?
10^9 =1,000,000,000
9^9 =387,420,489
362,880
3,628,800

The skating rink rented 872 pairs of skates during april and may.why? : if the skating rink rented three times the pair of skates in april during may, they rented 654 skates. 218 x 3 = 654then, if they want to know how many they rented during both april and may, then you just add 654 (may) and 218 (april) to give you 872 pairs of skates for both months.654 + 218 = 872hope this !