ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Math I Videos 77 videos
This video covers how to use cross products to solve for a missing number in a proportion by setting that proportion with a variable over the produ...
GED Math 2.4 Rational Numbers. Lucius's favorite restaurant is how many km from his home?
CAHSEE Math 1.1 Algebra and Functions 290 Views
Share It!
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.
Related Videos
CAHSEE Math: Algebra and Functions Drill 5, Problem 3. Solve the equation.
We don't like knocking people down to size, but we do like simplifying radicals. Join us?
If fleeing criminals always fled the scene of the crime at perfect right angles, it would be much easier to determine their whereabouts. Fortunatel...
Okay, so this probably isn't going to help you master Pokemon Go, but game theory can be applied to all sorts of situations. Even stomping your old...