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CAHSEE Math Videos 210 videos

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CAHSEE Math 2.2 Algebra and Functions 213 Views


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Description:

Algebra and Functions: Drill 2, Problem 2. If 2.5 pounds of ear wax were purchased, what would be the corresponding cost?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour.

00:06

The following graph relates the number of pounds of ear wax with the cost of said wax at a certain store.

00:12

Oh, come on. Where do you think candles come from?

00:15

If 2.5 pounds of ear wax were purchased, what would be the corresponding cost?

00:20

Here are the potential answers...

00:22

And yeah, hit pause. Try it yourself first. Go on.

00:27

This question is just asking whether we can read a graph.

00:30

BIG HINT: USE A RULER!

00:34

Well...this kind of ruler.

00:36

Ew, not like that.

00:38

Maybe just the edge of a piece of paper will do.

00:41

Here we are being asked to find the dollar amount that corresponds to 2.5 pounds of ear wax...

00:47

and here we see pounds.

00:49

If they'd put kilograms or tons or some other screwy metric, we'd have had to do some recalculating -

00:58

- but here it's just straightforward.

01:00

And we go over one, two... and a half... to the right.

01:04

Then look straight up.

01:05

It's a bird... it's a plane... no, it's the line intersecting the weight to price

01:09

dynamics of this problem.

01:14

Bet that was right on the tip of your brain. So now just look straight left from this point

01:18

of intersection on the line and we get a price. What is that price?

01:22

Well, we know that this is 0... and this is 20... so half way has to be 10.

01:28

And the line is slightly above the 10 and definitely not 15.

01:32

So look at the answer set -- it has to be B, or $12.50. Done.

01:37

If somehow you didn't hear the end of that explanation...

01:39

...you may need to get the wax out of your ears.

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