Melody

Use the calc on the home page :)

2.25 cups in 8 hours.  That is 

$${\frac{{\mathtt{2.25}}}{{\mathtt{8}}}} = {\frac{{\mathtt{9}}}{{\mathtt{32}}}} = {\mathtt{0.281\: \!25}}$$ 

cups per hour 

2hours  2*0.28125 cups

4hours   4*0.28125 cups

6 hours  6*0.28125 cups

you get the idea   

Just use brackets like this

(sin(63))^-1

There is a calc on the home page. 

All calculators have their pluses and minuses but this calculatior does have a lot of very nice features :)

f^-1(x)  =  (3 = x)/2  

geno means (of course)

$$f^{-1}(x) = \frac{ 3 - x}{2 }$$

Mathematician,

It is not a good idea to give negative points when people seriously try to help you.

If you know that the answer is incorrect of if you want to ask questions about their answer then add another post to explain what you are thinking.

We like people to be interactive with answering.  

Good answer Mathematician but you have not rounded it to the nearest hundredth!

You have rounded it to 3 significant figures  

$$\\cos^6x=cos^4x\\
$Divide both sides by $\;cos^4x\\
cos^2x=1\\
cosx=\pm1
$At this point I just think about the unit circle$\\
$cos of an angle is given by the x value (not the angle x)$\\
$The x value is 1 at 0 and it is -1 at 180 degrees$\\
So \\
x=180n$ degrees where $ n\in Z\\
or\\
x=n\pi$ radians where $ n\in Z\\$$