# GED Math 5.3 Graphs and Functions

GED Math Graphs and Functions Drill 5, Problem 3. How many more kilowatts is Kristoph's oven rated compared to his air conditioner?

 Functions Build a function that model a relationship between two quantitiesBuild a function that models a relationship between two quantitiesBuild functions that model a relationship between two quantitiesInterpret expressions for functions in terms of the situation they modelInterpret functions that arise in applicationsInterpret functions that arise in applications in terms of contextLinear FunctionsQuadratic Functions GED Math Graphs and Functions Language English Language Mathematical Practice Mathematical Fluency

### Transcript

00:22

which cost him five dollars and forty cents a day

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Her stuff also has an electric oven I'm using his

00:28

oven for an hour and a half cost forty five

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cents Chris stops oven is rated at blank kilowatts more

00:35

than his air conditioner Yeah all right Well is there

00:39

anything less fun than dealing with utility bills Don't say

00:42

taking the g e d all right so poor christoph

00:46

is getting slapped around by the power company What else

00:48

is we've all been there Fifteen cents per kilowatt hour

00:51

for electric which were told means that he pays fifteen

00:54

cents to run a one kilowatt appliance for one hour

00:58

Well running the cost him five dollars and forty cents

01:01

each day and using the oven cost in forty five

01:04

cents each hour and a half And we need to

01:07

know how the oven is rated compared to the a

01:10

c okay well let's roll up our sleeves and be

01:12

prepared to get dirty if we call p the power

01:15

rating of an appliance and see the cost of running

01:17

it for each hours than the product p age would

01:21

be the kilowatt hours used by running an appliance rated

01:24

at p for h hour here we've got all that

01:27

very clever people Each kilowatt hour cost fifteen cents so

01:32

we multiply ph by point one five to get our

01:35

cost or c so c equals point one Five p

01:39

h well to compare the ratings of crystals to appliances

01:43

will first need to find the rating of the a

01:45

c that's p a c and the rating of the

01:48

oven he oh separately for the a c we're told

01:52

that five dollars and forty cents or five point four

01:54

equals point one five times p a c times twenty

01:58

four a number of hours in a day So by

02:00

dividing to get the rating by itself we get p

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a c equals five point four divided by point one

02:07

five times twenty four for a total of one point

02:10

five kilowatt Then we could do the same deal for

02:13

the oven point four five equals point one five times

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p o times one point five the number of hours

02:22

christoph is using it Well this gives us a point

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Four five divided by point one five times one point

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five for a total of two kilowatt phil comparing apples

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to apples This case kilowatt kilowatt looks like the oven

02:36

is rated at two minus one point five four point

02:41

five kilowatts more than the a c and that's Our

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final answer Hopefully this problem helped catch you up on 00:02:47.313 --> [endTime] current events