Can someone help me with my english homework? i don't understand.

In this case, you are looking for contextual cues and evidence to provide a meaning for the word thrifty.

To achieve this ask yourself "What is happening around the word?" and "What is the overall tone of the excerpt?".

In this case, we see that Mathilde wants to buy a dress but is worried about what her "thrifty husband" would say when he saw the cost. With those clues, you can infer that thrifty means someone is cheap like the husband.

that his long years of service outweigh any faults he may have had.

he wanted to be remembered for the good things he did, one of those being when he gave up office so others would follow suit, but george washington wasn’t a man who thought he was perfect, he knew he made mistakes. he was a very talented soldier with a natural gift of tactic.

demonstrative is te word i think