Which pair of angles is supplementary

A

Step-by-step explanation:

The first pair of angles are supplementary since they are adding up to 180° because they are lying on a straight line

10 coins:

# of heads: 6

# of tails : 4

heads 6/10

tails 4/10

20 coins:

# of heads: 8

# of tails : 12

heads 8/20

tails 12/20

30 coins:

# of heads: 18

# of tails : 12

heads 18/30

tails 12/30

A. heads: 32 tails: 28

B. heads:30 tails: 30

C. Sometimes probability is wrong but it is a good way to guess the outcome.