Question

A certain triathlon consists of a 3.1-mile swim, a 120-mile bicycle ride, and a 26.6-mile run. At one point, a participant had completed four times as many miles as the
number of miles left to complete. How many miles had he completed at that mark?

Answer 1

Answer:

26.6a

Step-by-step explanation:

possible derivation:

$\frac{d}{da\\}$ (a 26.6)

Factor out constants:

= 26.6 [ $\frac{d}{da}$ (a) ]

the derivative of a is 1 :

= 1  26.6