Paulo tracks his commute time. The coordinate plane below shows some of his commute times in the last two weeks. The x-axis of the graph represents the number of days before today. For example, -1 would represent yesterday. The y-axis represents the commute time in minutes. 2 days ago, Paulo's commute time was halfway between his commute times 8 and 9 days ago.
At what coordinates should Paulo graph his commute time 2 days ago?

-2  Means Day 2  & 21 is commute time

Step-by-step explanation:

The coordinate plane below shows some of his commute times in the last two weeks.

See attached graph

Yesterday  means - 1

Days  8 means  - 8  

Day 9 means    -8

- 8 has dot  on  24   => Commute time on Days 8  = 24 minutes

-9 has dot  on   18   => Commute time on Days 9 = 18 minutes

2 days ago,   Paulo's commute time was halfway between his commute times 8 and 9 days ago.

=> Commute time on Days 2  =(24 + 18)/2 = 21

Day 2  =  - 2

Coordinate  = (-2 , 21 )        

-2  Means Day 2  & 21 is commute time

what i would say the best answer is a. 40.5