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Playlist Solving Equations and Inequalities 11 videos
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Word Problem Inequalities 2018 Views
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Description:
How do you figure out how long you have before the Galapagos Zombie Tortoises eat you? By using math, of course. If you can't solve this problem, we feel bad for you, son: we've got 99 word problems, and "Inequalities" is one.
Transcript
- 00:04
Word Problem Inequalities, a la Shmoop. On vacation in the Galapagos, your worst fear
- 00:11
comes true...
- 00:12
Zombie tortoises strike. You can see at least three thousand of them
- 00:19
shuffling toward you.
- 00:21
If "Z" represents the number of zombie tortoises, how would you put this into an inequality?
Full Transcript
- 00:27
Here are your options. The open part of the symbol should face whichever
- 00:36
value is greater...
- 00:38
Just like the gaping maw of the zombie tortoise opens wide, hungry for delicious brains...
- 00:46
Or an ankle... since they're pretty low to the ground.
- 00:49
Anyway, the answer is B. Since Z is greater than or equal to three thousand, you want
- 00:55
to put a line under the symbol. You need to get off the island. You know how
- 01:01
zombies are slower than humans? Zombie tortoises are even slower than regular tortoises. You
- 01:06
have a lot of time.
- 01:09
You have at most fourteen days before the zombies reach you. If "d" equals your days
- 01:18
to live, how would you express this with an inequality?
- 01:23
Here are your choices: Don't worry, we have plenty of time to break
- 01:30
this down. "At most" can also mean "fourteen or fewer."
- 01:46
B shows "greater than," so that one's out.
- 01:49
D is equals, so that one's out too. You could have fewer than fourteen days, so you better
- 01:55
play it safe.
- 01:56
"Fourteen or fewer" also means that "d" is "less than or equal to fourteen."
- 02:03
So the answer is C. So you have two weeks before those zombie
- 02:16
tortoises start munching away on your brain.
- 02:19
Slow and steady may not win this race.
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