I’m having a mental breakdown on this homework. answer all the questions for meh

Think about this:  some tutors might experience a mental breakdown when they see that you have asked for help with 6 questions without sharing any of the work you've done yourself.
 
I will focus on one problem, the 5th:

How many m are equivalent to 357 cm?  To work this out, you need to know that 1 cm = (1/100)m.  You can make a conversion factor from this.

Then, 

357 cm         1 m
= = 3.57 m (answer)
      1          100 cm

Please start over:  choose another problem to work on, and post that only that one problem at one time.