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CAHSEE Math 5.2 Algebra and Functions 198 Views


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Description:

Algebra and Functions: Drill Set 5, Problem 2. Based on the graph, what is the expected coal price for week six?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour.

00:05

It's three weeks until Christmas, and Santa is going coal shopping.

00:09

The graph below shows local average coal prices (in dollars per pound) over four weeks.

00:14

Based on the graph, what is the expected coal price for week six?

00:18

And here are the potential answers

00:20

Hit pause and try it yourself. Go on.

00:23

Can we read a graph and take its trendline? That's what this question is asking.

00:28

All we need is a ruler.

00:30

Uh, this kind of ruler.

00:32

We can hold it flat against the series of dots here, look down and continue until we

00:36

intersect the vertical line from week 6. If we wanna do this problem in a mathy way,

00:41

we simply observe the increase in price each week.

00:45

Prices have gone up 20 cents a week.

00:47

In week 4, coal is $3.80 so we can predict that in week 5 its 4 bucks and in week 6 which the question is asking,

00:54

it's $4.20. Answer C. Done.

00:58

Wait a second, that's not Santa!

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