Answer:
Step-by-step explanation:
Notice that H is a set with 106 - 81 = 25 elements.
Hence H has
subsets.
In order to get the proper subsets of H we just need to deduct one from 
So there are
proper subsets.
It’s only a vertical angle
Answer: Marcy will need to route 10 calls to spend a total of 20 mintes on the phone.
Step-by-step explanation: 1 call = 2 minutes.
It is called parallel lines when there is two line that never intersect