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Coordinates and Graphs Videos 64 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
The video will show you how to plot points in 3D using the axes of the 3D coordinate system. Make sure you're wearing your special glasses for this...
When graphing inequalities, you graph the line, shade the corresponding side, and plug in the point. The end!
CAHSEE Math 5.2 Algebra and Functions 239 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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