Jenny is four years older than miki. five years ago jenny was twice as old as miki. how old are they now?

If Jenny was twice Miki's age, and also, she is 4 years old, it means that Jenny was 8 years old and Miki was 4 years old. As this happened five years ago, then currently: Jenny = 8 + 5 = 13 years and Miki = 4 + 5 = 9 years.
Finally, Jenny is 13 years old and Miki is 9 years old.

a.capital gains

Explanation:

Capital gains income -

It refers to the increase in the amount of the capital asset , where the amount received from selling the asset is more than the amount at the time of purchase , is referred to as capital gains income.

This gain can be long term as well as short term , and the amount of the asset can not be estimated , until and unless the asset is sold in the market.

Hence, from the given scenario of the question,

Trevor is practicing , capital gains income.