The first graphed rational number is at the middle of -2 and -1, thus the number represented is

The second graphed number is five out of six places from from 0 to 1, thus the number graphed is

The difference between the two numbers can be represented as

or

To find the difference,

Also,

Multiply the top equation by -3 and added to the second one.
By Elimination.
Answer:
72 is the mode
Step-by-step explanation:
The mode is the number that appears the most in the sequence. 72 appears twice. no other number appears twice other than 72
28/4 = 7. 7 x 3 = 21, so 28 - 21 = 7. 7 cards left. 28 - 3c = 7.