Last question I need help on

1 is c

2 is a

3 is a

step-by-step explanation:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.