Which of the sets of ordered pairs represents a function?

a = {(3, −5), (4, 6), (−3, 9), (2, 7)}
b = {(2, 4), (−1, −7), (5, 6), (4, 3)}

only a

only b

both a and b

neither a nor b

Both A and B

Step-by-step explanation:

A = {(3, −5), (4, 6), (−3, 9), (2, 7)}  

-Each x goes to a different y so this is a function

B = {(2, 4), (−1, −7), (5, 6), (4, 3)}

-Each x goes to a different y so this is a function

the 1st digit is in the 100s n its 1

step-by-step explanation:

3,589÷18 = 199.389

so the first digit of the quotient is in the 100s n its 1