Fyi I didn't find this on google or anything I did the calculation on my computer and yes this is correct...
If it's wrong I'm sorry...
Number 15 is no solution.
Number 27 is that x has to be between -2 or 2.
This could be explained as -2≤x≤2
(1, 9) and (11,1)
slope
= (9 - 1)/(1 - 11)
= 8 /-10
= -4/5
= - 0.8
answer
slope = - 0.8
Answer:

Step-by-step explanation:
this is the equation used to find the average of two numbers.
OK so you take the 5 miles in one hour and divide that by 2 to find the half hour
x=5/2 x= 2.5 miles
To find the 2 1/2 hours you take the hour distance (5) double it and add the half hour distance
x=(5 x 2) + 2.5 x= 10 + 2.5 x=12.5 miles