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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?
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
Full Transcript
- 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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