Question

Question 57:

Ceci and Alicia are both participating in a charity bike ride event. riders in the event can choose between a 20-Kilometer route or a 30-kilometer route.

Ceci chooses the 30-kilometer route, and Alicia chooses the 20-kilometer route. All riders start at the same time regardless of which route they choose.

The equations shown represent Ceci's and Alicia's distances, y, in kilometers, from the finish line as a function of time, x, in minutes, since the ride started.

Ceci′s equation: y=−1/3x+30


Alicia′s equation: y=−1/5x+20


What is the appropriate domain for the equation representing Alicia's distance from the finish line as a function of time?

(1 point)

0≤y≤20



0≤x≤100



0≤x≤20



0≤y≤100


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Answer 1

Alicia finishes when y = 0. Solve −(1/5)x + 20 = 0 → x = 100. Time starts at 0, so the domain is 0 ≤ x ≤ 100.