Question

Derek and his friends drove from San Francisco to Lake Tahoe to go skiing. The average speed that they traveled during each leg of the trip is shown on the map. They drove 30 min in the city, 3 h on the highway, and 30 min up the mountain.
Write a piecewise function to represent the distance that Derek traveled during his four hour trip.

Answer 1

The piecewise function of the travel of the car is now described in detail:

$x (t) = 30\cdot t,\,0 \le t < 0.5$  

$x(t) = 15 + 60\cdot (t-0.5)$,  $0.5\le t < 3.5$  

$x(t) = 195 + 45\cdot (t-3.5)$,  $3.5\le t \le 4$  

How to build a piecewise function

A piecewise function is a group of functions working on certain intervals, which corresponds to three expressions in this case. Likewise, the car moves at constant speed and the resulting distance is equal to the sum of initial position ($x_{o}$), in miles, and the product of speed (v), in miles per hour, and time (t), in hours.

Then, the piecewise function of the travel of the car is now described in detail:

$x (t) = 30\cdot t,\,0 \le t < 0.5$   (1)

$x(t) = 15 + 60\cdot (t-0.5)$,  $0.5\le t < 3.5$   (2)

$x(t) = 195 + 45\cdot (t-3.5)$,  $3.5\le t \le 4$    (3)

Remark

The map with key information of velocities is missing. We proceed to show the required information:

City - 30 miles per hour

Highway - 60 miles per hour

Mountain - 45 miles per hour

To learn more on piecewise functions, we kindly invite to check this verified question: https://brainly.com/question/17966003