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
The question you posted doesn't really show the question. Are there any words like how, when, where.... and do you have answer choices? : ) maybe then I can help?
Answer:
Amount of water needed for 10 serving = 7.5 cup
Step-by-step explanation:
Given:
1 serving needed water = 3/4 cup
Find:
Amount of water needed for 10 serving
Computation:
Amount of water needed for 10 serving = 10[3/4]
Amount of water needed for 10 serving = 7.5 cup
Answer: Isolate the variable by dividing each side by factors that don't contain the variable. x=−4
Step