Answer:
a. The light travels 4,500,000 kilometers in 15 seconds
b. It takes the light 40 seconds to travel 12 million kilometers
Step-by-step explanation:
- The function d(t) = 300,000 t represents the distance in kilometers
that light travel in t seconds
a.
- We need to find how far the light travels in 15 seconds
∵ d(t) = 300,000 t
∵ t = 15 seconds
- Substitute the value of t in the function above
∴ d(t) = 300,000 (15)
∴ d(t) = 4,500,000 kilometers
<em>The light travels 4,500,000 kilometers in 15 seconds</em>
b.
- We need to find how long does it takes the light to travel 12 million
kilometers
∵ d(t) = 12 million kilometers = 12,000,000 km
∵ d(t) = 300,000 t
- Substitute the value of d(t) in the function
∴ 12,000,000 = 300,000 t
- Divide both sides by 300,000
∴ t = 40 seconds
<em>It takes the light 40 seconds to travel 12 million kilometers</em>
