Given the functions f and g , explain why you cannot find f ⋅ g . f = { ( − 1 , 7 ) , ( 1 , 3 ) , ( 3 , 4 ) , ( 6 , 8 ) , ( 7 , 0 ) } g = { ( 0 , 1 ) , ( 2 , − 6 ) , ( 4 , 7 ) , ( 5 , 1 ) , ( 8 , − 1 ) }