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CAHSEE Math 1.1 Algebra and Functions 290 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?

Language:
English Language

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...

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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