Answer:

Step By Step Explanation:
Expand 

Expand 

Simplify 

Binomial theory : ( a - b ) ^3 = a^3 - 3a^2b + 3ab^2 - b^3 ;
Then, ( 2y - 3x ) ^3 = 8y^3 - 36y^2x + 54yx^2 - 27x^3
I hope this helps you
slope=y2-y1/x2-x1
slope=2-(-1)/1-2
slope=3/-1
slope= -3
Answer :
-8 miles per min
He travels 3.25min
-8 x 3.5= -26
He traveled 26 miles in 3.25
I hope this helped