• December 5th 2006, 02:49 PM
fatcow2000
hey guys, im new here, i need some help on a take home test (go figure)...

the questions are easy, but our teacher never helped us with them and doesnt explain very well, please help me with these questions:

http://i81.photobucket.com/albums/j2...punks/math.jpg
• December 5th 2006, 03:04 PM
OReilly
Quote:

Originally Posted by fatcow2000
hey guys, im new here, i need some help on a take home test (go figure)...

the questions are easy, but our teacher never helped us with them and doesnt explain very well, please help me with these questions:

http://i81.photobucket.com/albums/j2...punks/math.jpg

Domain of the function $f(x) = \sqrt x$ is $x\ge0$

Substitute x for -2:
$\begin{array}{l}
f(x) = x^2 - 2x + 3 \\
f( - 2) = ( - 2)^2 - 2 \cdot ( - 2) + 3 \\
f( - 2) = 4 + 4 + 3 \\
f( - 2) = 11 \\
\end{array}
$

First you find g(2):
$\begin{array}{l}
g(2) = 2^2 - 1 \\
g(2) = 3 \\
\end{array}
$

Now find f(3):
$\begin{array}{l}
f(3) = 2 \cdot 3 + 1 \\
f(3) = 7 \\
\end{array}
$

So: $f(g(2)) = 7$

Set of five elements can have: 5+10+10+5+1=31 subsets and empty set as subset.
So total of 32 subsets.
• December 5th 2006, 03:15 PM
Plato
OReilly do you know what a take-home test means?
Don’t you think that a person should do her/his own work?
But anyway you missed one!
• December 5th 2006, 03:23 PM
OReilly
Quote:

Originally Posted by Plato
OReilly do you know what a take-home test means?
Don’t you think that a person should do her/his own work?
But anyway you missed one!

Of course, but take-home can mean "go on Internet from your computer in home and post test on MathHelpForum to do it someone for you at home"! :)

What did I missed?
• December 5th 2006, 03:42 PM
Plato
Quote:

Originally Posted by OReilly
What did I missed?

Well let's let fatcrow200 guess at that one!
• December 5th 2006, 03:44 PM
OReilly
Quote:

Originally Posted by Plato
Well let's let fatcrow200 guess at that one!

No, he can't. I already corrected myself.:D