5 times 19-13 would equal 30 as 19-13 is 6 times 5 =30
It's not a function because the x value repeated but wasn't accompanied by the same y value . there is (-2,2) and (-2,14) but if they had the same y value like (-2,2) and (-2,2) or (-2,14) and (-2,14) the table would represent a function. If you still dont understand I'll be more than happy to elaborate :)
Answer:
Dividend

Divisor

The rule of division of polynomial which is same as division of real numbers states that
Dividend = Divisor × Quotient + Remainder
The division process is shown below.
Quotient = x+5
Remainder =0
Are you sure this is written correctly. It is not factorable as it is