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Playlist CAHSEE Math Test Prep: Algebra and Functions 30 videos
Algebra and Functions: Drill 2, Problem 2. If 2.5 pounds of ear wax were purchased, what would be the corresponding cost?
Algebra and Functions Drill 2, Problem 3. After 10 minutes of walking, how far apart are they?
Algebra and Functions Drill 2, Problem 4. What is the approximate area of this region if the square has a perimeter of 32?
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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