Which branch determines then number of supreme justices?

Question

I need to know because i couldn't find it on the internet. and please don't make it to complicated because i am only a 5th grader

Answer 1

the amount is 8 and 1 chief justice so 9. this was set long ago by congress.  it has been this way since 1869.

Answer 2

The Judiciary Act of 1869 fixed the number of Supreme Court Justices at nine.  This was an act of Congress, and it was signed by the President.

Answer 3

I believe its congress that approves it.

Answer 4

its the act of congress but approved by the president