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Functions as Models 730 Views


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Description:

Functions briefly flirted with the idea of being infomercial hosts, but they didn’t shine when talking on-camera. They’re much better off in the modeling world. Plus, they have a better shot at dating an NFL quarterback.

Language:
English Language

Transcript

00:04

Functions as Models, a la Shmoop. Kavi just had his wedding ring stolen.

00:12

That Gollum creep made off with it, and is heading to the Misty Mountains.

00:17

Anyway, Kavi is a world-class triathlete… …and he has 210 kilometers to close the

00:22

gap before Gollum escapes with it forever… In his quest for the ring, Kavi swims for

00:26

2 hours at x kilometers per hour, then bikes for 3 hours at 20x kilometers per hour, and

00:34

finally runs for 2 hours at 4x kilometers per hour…

00:38

…what is his average speed while biking? Here are your choices:

00:45

Kavi has plenty of time to do the math while he’s on his journey.

00:48

He knows that speed equals distance over time. We can rewrite Kavi’s journey as:

00:53

2 times x… plus 3 times 20x… plus 2 times 4x… equals 210…

01:01

…where the first term is his swimming distance, the second term is his biking distance, and

01:07

the third term is his running distance. When we simplify the equation, we get:

01:12

2x plus 60x plus 8x equals 210. So 70x equals 210.

01:25

Divide 70 from both sides, and we see that x is equivalent to 3 kilometers per hour.

01:30

Remember, we’re looking for Kavi’s biking speed, which is 20x…

01:34

So we multiply 20 by our 3 kilometers per hour to get 60 kilometers per hour…

01:39

…and our answer is “E”. As it turns out, Kavi arrives at the same

01:44

answer we did… …just as he catches up with Gollum, and

01:47

wrestles the ring from the creature’s grasp. When he’s done, Kavi throws him into molten

01:52

lava for good measure. Dude’s had a rough week.

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