Question

Find the domain of f(x) = 15x + 85

Answer 1

Don't know how to find the domain of a function.

Answer 2

Yea Im looking around and seeing so I can help you :D

Answer 3

:D

Answer 4

You have any answer choices I may look at to see ?

Answer 5

No, I don't. . .

Answer 6

This is the whole question:

1. Marco and his two younger sisters would like to purchase a silver charm bracelet for their mother’s birthday. They went to the mall and found what they were looking for at Store A. In Store A, the bracelet without charms costs $85 and each charm costs $15.

And there are 5 questions to them. . .

Answer 7

And there are 5 questions to it***

Answer 8

I got the answer : F(x) = 5(3x+17)

Answer 9

The first question is:

A. Use function notation that models the total price of the bracelet and how that price is based on the number of charms. Explain the reasoning behind your equation.

I already got the equation f(x) = 15x + 85

Answer 10

And the question says to explain why this is the best domain.

Answer 11

o.o have look around in your lesson ?

Answer 12

http://www.wikihow.com/Find-the-Domain-of-a-Function

Answer 13

??

Answer 14

How can you do that?

Answer 15

Imma find help

Answer 16

Okay

Answer 17

whats the answer choices

Answer 18

There aren't any

Answer 19

It's an ASSIGNMENT. Here's the WHOLE question:

1. Marco and his two younger sisters would like to purchase a silver charm bracelet for their mother’s birthday. They went to the mall and found what they were looking for at Store A. In Store A, the bracelet without charms costs $85 and each charm costs $15.
A. Use function notation that models the total price of the bracelet and how that price is based on the number of charms. Explain the reasoning behind your equation.
B. What would be a reasonable domain for this function based on this scenario? Explain why this is a proper domain.
C. If Marco and his sisters have saved $250, make a graph to show all of the charms they could purchase with a bracelet if they had saved between $85 and $250.
D. Marco found five charms that he likes. Using your function, determine the cost of the bracelet he would make.
E. As they walked down the hall of the mall, Marco saw this sales flyer for Store B on a bench

Answer 20

The ONLY question I need help with is B.

Answer 21

I can figure out the rest on my own.

Answer 22

defintion of domain The set of values of the independent variable(s) for which a function or relation is defined. Typically, this is the set of x-values that give rise to real y-values.

Note: Usually domain means domain of definition, but sometimes domain refers to a restricted domain

Answer 23

I don't understand that definition. I just need to know how to figure out the domain of a function. I tried looking it up but all the answers seem complicated.

Answer 24

Hi,
the domain for ur problem is the set of Natural numbers..

do u need explanation ?

Answer 25

Yes, I need to know the domain for my equation and how it's the best domain for it.

Answer 26

@phi

Answer 27

Do u know the elements that belongs to the set of Natural numbers?

Answer 28

the set of natural numbers represent the counting numbers excluding 0. And it it denoted by the symbol \[\mathbb{N} \]
Where
\[\mathbb{N} = \left\{ 1 , 2, 3 .... \right\}\]

Answer 29

Oh, yeah.

Answer 30

and ur function is
f(x) = 15x + 85
Actually the domain for this is the set of all Real numbers.... cause "x" can take any value it want if take f(x) just as an equation
Before we continue...
Do u know about the set of Real Numbers ?

Answer 31

*** B. What would be a reasonable domain for this function based on this scenario? Explain why this is a proper domain.***

I would use the positive integers {0,1,2...}

the reason is that you cannot buy a bracelet with -1 charms.
You can buy a bracelet with no charms (x=0) or 1 charm, or 2 charms and so on...

In the real world, there is an upper limit on the number of charms you can add to the bracelet. If you call that max number M, then you can say the domain is
{0,1,2...,M}

Answer 32

I picked integers because I assume you cannot buy a fraction of a charm.

Answer 33

Okay.

Answer 34

The set of Real Numbers represent any value that can be represent on a number line. That''s the most basic explanation...

Let's move to ur question again..
As I told u before the domain of f(x) is the set of real numbers...
but the set of real numbers exist in all negative and positive and square root form which is not possible in real world...
U can only find full pieces of charms in the real world... So the domain should be a range of numbers that include only the counting numbers...
The only set that satisfy the above condition is the set of Natural numbers

Hope this will help ya!!

Answer 35

and I think @phi explanation is much more clearer than mine!!

Answer 36

Oh, okay so my domain is 0 or higher, but there has to be a limit of charms that you can put on the bracelet, like phi said. So I can put my Domain as 0, 1, 2, 3, 4, 5 . . . M.??

Answer 37

yep!! u r right... :-)

Answer 38

Thanks so much @***[ISURU]*** and @phi