ANSWER ASAP, WILL MARK BRAINLIEST "Find a) domain, b) range and c) determine if it is a function and explain your reasoning."

Step-by-step explanation:
3) Domain = {1,2,3,5,7}
Range = {4,7,9,12}
It is a function because each domain has only one range
4) Domain = {0,2,3,8}
Range = {2,3,7,9}
It is not a function because 3 in Domain has two ranges 3, 9