Question

the function d(t) = 300,000t represents the distance (in kilometers) that light travel in t seconds find d(15) and explain it's meaning

Answer 1

This is just like an f(x) problem, but the letters are different. First though, the t in d(t) will substitute for the t in the problem d(t)=300,000t. This is what it will look like:

d(t)=300,000t

d(15)=300,000t

d(15)=300,000(15)

d(15)=4,500,000.

To explain it, this means that in 15 seconds light will travel 4,500,000 km.