ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Statistics Videos 87 videos

SAT Math 6.1 Geometry and Measurement
3974 Views

SAT Math 6.1 Geometry and Measurement

CAHSEE Math 3.4 Statistics, Data, and Probability I
363 Views

Statistics, Data, and Probability I: Drill Set 3, Problem 4. How many different avatars can be created based on the given options?

CAHSEE Math 3.2 Statistics, Data, and Probability II
224 Views

Statistics, Data, and Probability II Drill 3 Problem 2. Which two sports together make up for the preferences of more than half of all those w...

See All

CAHSEE Math 5.4 Algebra and Functions 181 Views


Share It!


Description:

Algebra and Functions: Drill Set 5, Problem 4. What would be the total cost if a person buys 15 wigs at this store?

Language:
English Language

Transcript

00:02

Alright shmoopy question of the day, comin' at ya...

00:06

A wig store is having a sale on genuine, 100% rat-fur wigs, where the first wig purchased costs $10.

00:13

...the total cost in relation to the number of wigs bought is given by the plot below.

00:19

What would be the total cost if a person buys 15 rat wigs at this store?

00:24

And here are the potential answers...

00:25

Try them yourself first before you look forward.

00:30

So... this question is asking us to decipher a graph and recognize a pattern --

00:34

then throws a few curveballs at our heads.

00:37

Which hopefully won't knock the wigs off our skulls.

00:39

Let's think aloud a bit -- the FIRST wig costs 10 bucks.

00:43

Note the 2 here at the bottom of the graph -- that's the second wig -- the TOTAL

00:48

cost of BOTH wigs is 15 bucks.

00:51

So if the first was 10 then the second must have cost 5 bucks more.

00:56

Look at the 3 -- it's telling us that 3 wigs cost 20 bucks and if we look forward,

01:01

a pattern comes clear here...

01:03

...the first wig was 10 bucks but each subsequent wig is 5 bucks.

01:08

So if we have 15 wigs in TOTAL that we are buying, 14 of 'em cost us

01:13

5 bucks each or a total of 70 dollars...

01:16

...and then we have to add that first expensive one for 10 bucks

01:20

so that the total for ALL of 'em costs 80 bucks.

01:23

And note in the answer set there are all kinds of answers that are... close.

01:28

The RIGHT answer, though, is 80 or C.

01:31

Now we can all look dashing in our affordable new rat-fur wigs.

Related Videos

CAHSEE Math 5.3 Algebra and Functions
2033 Views

CAHSEE Math: Algebra and Functions Drill 5, Problem 3. Solve the equation.

SAT Math 6.1 Geometry and Measurement
3974 Views

SAT Math 6.1 Geometry and Measurement

CAHSEE Math 3.4 Statistics, Data, and Probability I
363 Views

Statistics, Data, and Probability I: Drill Set 3, Problem 4. How many different avatars can be created based on the given options?

CAHSEE Math 3.2 Statistics, Data, and Probability II
224 Views

Statistics, Data, and Probability II Drill 3 Problem 2. Which two sports together make up for the preferences of more than half of all those w...

CAHSEE Math 3.3 Statistics, Data, and Probability II
198 Views

Statistics, Data, and Probability II Drill 3 Problem 3. One hundred twenty of those who were asked preferred what sport?