How many positive integers, including 1, are divisors of both 40 and 72?

1,2,4,8

Step-by-step explanation:

1 x 40 = 40

1 x 72 = 72

2 x 20 = 40

2 x 36 = 72

4 x 10 = 40

4 x 18 = 72

8 x 5 = 40

8 x 9 = 72

b

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