Answer:
Part A: 

Part B: 

Explanation:
Part A: What is the reciprocal of 2.
2 is just 
 in fraction terms. To find the reciprocal, you just have to flip it over. That would get to 
. Therefore, the reciprocal is 
. 
Part B: What is the reciprocal of 9 over 10?
9 over 10 in numerical terms is just 
. o find the reciprocal, you just have to flip it over. That would get to 
. Therefore, the reciprocal is 
. 
Hope this helped! If not, please let me know! <3