Question

Will post in the attachments

Answer 1

here is the first one that I need help with @Michele_Laino

Answer 2

https://books.google.lk/books?id=SPlBZ7ttOEAC&pg=PA374&lpg=PA374&dq=what+are+the+domain+restrictions+of+this+expression&source=bl&ots=-p9Qqjsfbc&sig=gC--i_uOfJPBBGA7Ixi96m0NVWg&hl=en&sa=X&ved=0ahUKEwiq9_PCh6fJAhVRc44KHdhaBsoQ6AEIJzAB#v=onepage&q=what%20are%20the%20domain%20restrictions%20of%20this%20expression&f=false
That will help you. I'm not good at teaching these though

Answer 3

hint:
denominator can not be equal to zero

Answer 4

so we can write:
\[\huge 6{m^2}{n^2} \ne 0\]

Answer 5

for example, if \(m=0\) what is \(6m^2n^2=...?\)

Answer 6

@goalieboy