light travels about 186,000 mi/s. The function d(t)=186,000t gives the distance d(t), in miles that light travels in t seconds. How far does light travel in 39s?
To find how far light travels in 39 seconds, substitute 39 for t in the function d(t) = 186,000t:
d(39) = 186,000(39)
d(39) = 7,254,000
Therefore, light travels about 7,254,000 miles in 39 seconds.