Answer: 12,620,256
Step-by-step explanation:
Given: The camera shop socks eight different types of batteries and there re at least 31 batteries of each type.
Here we want to select r= 31 batteries from n= 8 kinds of batteries, then formula we use to find number of ways is 

Hence, the number of ways can a total inventory of 31 batteries be distributed among the eight different types = 12,620,256
Answer:
No.
Step-by-step explanation:
Since we do not know the location of each house in relation to the school, we cannot figure out who is goona arive faster
1 yard = 3 feet, so 2yds x 1yd is the same as 6ft x 3ft, or 18 square feet
If one acre contains 43,560 square feet, and the question asks how many trees can be planted per acre, then all we have to do is divide 43,560 by 18:
43,560 ÷ 18 = 2420 trees
So, the answer is A) 2,420.