Answer:
option A, C and D
Step-by-step explanation:
Each relation is a function if each input has only one output
{a, 1), (6, 1), (C, 1)
This relation is a function because each input has only one output
{a, a),(a, b),(a, c)}
This relation is not a function because input 'a' has only three output
{(1, a), (2, a),(3, a)}
This relation is a function because each input has only one output
{a, a), (b, b), (C, c)}
This relation is a function because each input has only one output
6 + 3q + 306 + 153q + 15
156q + 327
The system of equations of two unknowns is formulated and solved.
The fraction that satisfies the request is 
, since in 
the negative signs are canceled and the first fraction is obtained.
It only has two number sentences because 81 divided by anything else wont work only 9 would. Also since 9 times 9 is equal to 81
I believe the answer to be only sequence A.
-Hope this helps, have a nice day! :)
