In may of 1998, bart and joe attempted to become the first people to fly around the world in a hot air balloon. based on an average speed of 90 kilometers per hour, the distance that they traveled in kilometers, d, can be modeled by d(t) = 90t, where t is the time in hours. they
traveled a total of 45 hours.

write the domain in interval notation.

the cost c (in dollars) of placing color advertisement in a newspaper is modeled by
c = 8.0n + 5 where n is the number of lines in the advertisement.

complete the following by selecting choices from key features listed in a-d:
a. the price of each line in ad b. initial cost of a color ad
c. 8.0
d. 5

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