Question

The function d(t) =300,000t represents the distance (in kilometers) that light travels in t seconds

find d(15) and explain it's meaning

Answer 1

`d(15)=4,500,000` kilometers

Explanation:

The distance traversed by a beam of light is represented as a function of time:

`d(t)=300,000 t`

This function represents distance traveled by the light in 't' seconds.

Now d(15) means, how much distance will the light beam cover in 15 seconds.

Putting t=15 in the function will tell us the distance traveled by light in 15 seconds.

`d(15)= 300,000 * t=300,000* 15=4,500,000`

So basically light has traveled, 4.5 million kilometers in 15 seconds.

Answer 2

We were given the distance, d as a function of time, t.

`d(t)=300,000t`.

To find
`d(15)`, we put
`t=15`, in to

`d(t)=300,000t`

This implies that,

`d(15)=300,000(15)`

`d(15)=4,500,000`

This means that in 15 seconds light covers a distance of 4,500,000 kilometers