Word Problem Inequalities

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.

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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.