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This video covers both independent and dependent events, although we much prefer independent events. Dependent events are just so dang clingy.
Disjoint events are events that cannot happen at the same time. If one happens, the other doesn't. Simple as that. Overlapping events, on the other...
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
CAHSEE Math 1.1 Algebra and Functions 369 Views
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Description:
CAHSEE Math Algebra and Functions: Drill Set 1, Problem 1. At this rate, what is the total cost of 10 songs?
- Functions / Build a function that model a relationship between two quantities
- Functions / Build functions that model a relationship between two quantities
- Functions / Build a function that models a relationship between two quantities
- Functions / Build a function that models a relationship between two quantities
- Algebra and Functions / Rate, speed, distance, and time
Transcript
- 00:03
Here's a shmoopy question for you...
- 00:07
Unlike his shady friend Dishonest Paul, Honest John actually pays for songs from iTunes.
- 00:13
He pays for x number of songs at a total cost of $12.50.
- 00:19
At this rate, what is the total cost of 10 songs?
- 00:22
Here are the potential answers...
Full Transcript
- 00:24
Alright, hit pause. Try it yourself.
- 00:29
OK, this question is testing whether we know the business formula for cost...
- 00:34
...or a fancy way of asking us to calculate the unit price times a quantity.
- 00:39
The formula looks like this:
- 00:40
Price times quantity equals total cost.
- 00:44
Well, we know the base elements here...
- 00:46
Price times number of songs equals $12.50.
- 00:49
So we can set up the equation... px equals 12.5
- 00:54
We should isolate p in the equation because we'll want to use p later to find the total
- 00:58
cost of 10 songs...or 10p.
- 01:01
To isolate p, we can divide x from both sides of the equation... getting p equals 12.5 over x.
- 01:08
Remembering that we want to find 10p...
- 01:10
we can multiply 10 times 12.5 over x to get 125 over x.
- 01:16
And it looks like our answer is B.
- 01:19
Of course, if your name is Dishonest Paul, you already knew that.
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