# Thread: Help on alg 2 homework. (due tommorow a period)

1. ## Help on alg 2 homework. (due tommorow a period)

Hey!
Im new here so before asking my question, I'll introduce myself.
My name is jacob, I live in Flagstaff, Az. I frequently skii, and I run in cross country. (and track)

Anways, here is my question.

This is for function notation:

Solve.
On one day the vlue of $1.00 U.S. was equivalent to 0.77 euro. On the same day$1.00 U.S. was equivalent to $1.24 Canadian. Write a function to represent the value of Cnadian dollars in euros. What is the value of the function for an input of 5 rounded to the nearest cent, and what does it represent? Anways, I dont really get how to write that out, or how to get the output with 5 the input. Same with this one: PC Heaven sells computers at a 15% discount on the oriinal price plus a$200 rebate. Write a function to represent the final price of a computer at PC Haven. What is the value of the function for an iput of 2500, and what does it represent?

Also it says to graph these fuctions.
f(x) = x2 - 4. (the 2 is suppost to be a squard sign. Sorry I don't know how to do superscript online.)
I know you can do it somehow with slope intersept form, but I'm unsure how, to apply it to this.

Thank you vary, vary much!

2. Originally Posted by F.A.S.T.
Hey!
Im new here so before asking my question, I'll introduce myself.
My name is jacob, I live in Flagstaff, Az. I frequently skii, and I run in cross country. (and track)

Anways, here is my question.

This is for function notation:

Solve.
On one day the vlue of $1.00 U.S. was equivalent to 0.77 euro. On the same day$1.00 U.S. was equivalent to $1.24 Canadian. Write a function to represent the value of Cnadian dollars in euros. What is the value of the function for an input of 5 rounded to the nearest cent, and what does it represent? Anways, I dont really get how to write that out, or how to get the output with 5 the input. Same with this one: PC Heaven sells computers at a 15% discount on the oriinal price plus a$200 rebate. Write a function to represent the final price of a computer at PC Haven. What is the value of the function for an iput of 2500, and what does it represent?

Also it says to graph these fuctions.
f(x) = x2 - 4. (the 2 is suppost to be a squard sign. Sorry I don't know how to do superscript online.)
I know you can do it somehow with slope intersept form, but I'm unsure how, to apply it to this.

Thank you vary, vary much!
1. Let USD represent US dollars, EUD represent Euro dollars and CAD represent Canadian dollars...

So 1 USD = 0.77 EUD and 1 USD = 1.24 CAD

Which implies that 0.77 EUD = 1.24 CAD, and by dividing both sides by 1.24, we can find out what 1 Canadian dollar is in terms of Euros.

So $CAD = \frac{77}{124} EUD$.

I take it the input of 5 is an input of 5 European dollars (since EUD is the independent variable), so substitute 5 for EUD and find out how many CAD you get...

2. Let S represent the sale price of the computers and P can be the original price (for example).

If the original price is discounted by 15%, then the sale price is 85% of the original price. If a $200 rebate is then added, that means you'd save another$200, so subtract that from the sale price as well.

In maths that gives

$S=\frac{85}{100}\times P - 200$

Then let P = \$2500 to find out the sale price.

3. To graph $f(x)=x^2 - 4$ you could input a range of x values, find the corresponding f(x) values, plot the (x, f(x)) coordinates and join them together. With a bit of analysis though, it's easy to see that $x^2 - 4$ is the same graph as the $x^2$ graph, translated down by 4 units.

3. Thank you so, so much!

That really helped me out.