Q: Can you help me write the background of my study on the functions of music in everyday life?

Detailed Question -

I am still a high school student. Here is the topic of my practical research: The factors influencing the functions of music in everyday life.

2 Answers to this question
Answer:

Since I am not familiar with your area of research, I will not be able to give you inputs specific to your topic. However, these articles will help you understand how you can write the background of a study: 

Answer:

While both are correct, I think it is preferable to use the first option, that is, use the tilda before both the quantities. This will ensure that there is complete clarity and readers do not misunderstand that the second value is an absolute value, not an approximate one. Therefore, I would recommend using this format: 

The performance of method A and B improved by ~45% and ~38% respectively.

However, please check if your journal or the style manual used in your field recommends the use of any specific format.

Related reading:

Scientific writing: Difference in meaning of "about," "around," and "approximately"