Walk the turtle to analyze the relationship between distance and time

A=d/t
acceleration = distance / time
The turtle's acceleration can be calculated by measuring distance and time and putting it in the formula. Through use of the formula, you can figure out distance and time are inverses. inverse means that when one quantity goes up, the other goes down.
Distance and Time are inverses.

(a-4)(a-5) goes with b
(a-10)(a-2) goes with d
(a-4)(a+5) goes with a
(a-10)(a+2) goes with c
e is not used. 

if you want to check take the pairs and foil or box them out.