Catchick

I put water, Pd(C), sodium hydroxide, sodium borohydride and 4-nitrophenol in a beaker and mixed them, then I filtered it and added hydrochloric acid to it until there was a precipitate. This precipitate was 4-aminophenol. I am having trouble coming up with a chemical reaction for this....if I were to write the reaction out, what would it be?

Thanks :)

True or false? The function f(x) = tan(x - pi/2) is not defined at x = pi/2, 3pi/2, 5pi/2......

Could anyone tell me whether it is true or false and explain why? I thought it was false because tan(pi/2 - pi/2) = tan(0) = 0, but my textbook said it was true. Who is right and why? Thanks :)

How do I solve this?

The vapour pressure of a solvent is the amount of gaseous molecules over an open vessel of solvent. A 50/50 mix of benzene and toluene has 46.7torr of benzene and 13.5torr of toluene at STP. What is the pressure of air over this mixture?

I know that the answer is 699.8 torr, but how was that answer determined? Thanks :)

How can I solve this?

Prove that f is continuous for all real numbers where f(x) = cosx if x < pi/2 and sinx if x >= pi/2.

Thanks :)

How can I solve this question?

Let f(x) = (A^2)(x^2) if x =< 2, (1-A)x if x > 2. For what values of A is f continuous at 2? How would I solve this?

Thanks :)

I recently got a Windows 8 computer, and I have been transferring all my stuff over from my Windows 7 computer. Some of my videos won't work now. Most of them do, but there are a few that don't, and I'm not sure why because they are the same format and everything as the ones that do work. Can anyone tell me what is wrong and how to fix this?

So I work at a convenience store, and the other day, my coworker left out some fake bugs to scare me. So today, I left out a lot of bugs to scare her. She told me she's going to get me back the next time I work, so I need to have a plan to get her back (again). Any ideas?

Given that u x v = |u| |v|, what do you know about these two vectors??

Thanks :)

So I joined my school soccer team, and I really suck at it but I know that most of that is mental because I have no confidence and I am afraid of the ball. Does anyone know of any way I can try to get over this problem?

Thanks :)

How can I solve this?

There is a cylindrical can with a volume of 3456pi. Find the height and radius that will minimize the surface area.

How can I solve this?

A new cottage has just been built across the river and 300m downsteam from a telephone relay station. The river is 120m wide. The cottage needs to be wired, and some of the wiring will have to go underneath the river. It costs $15 for wire under the river and $10 for wire above the river. How much wire should go under the river in order to minimize the cost?

Thanks :)

So, my friend played a mean joke on me for April fools, and to get her back, I am making a shrine to Justin Bieber to put in her locker (she hates Justin Bieber) and I was wondering what I should put on it. School appropriate, of course.

Thanks :)

The number of bus riders per day is represented by 1200(1.50 - x) where x is the fare in dollars. What fare maximizes the total revenue?

How do I solve this?

Thanks :)

So my friend just played a mean prank on me, and I need to get her back. Any ideas?

Thanks :)

Is this function odd, even or neither? I think it might be odd but I'm not 100% sure.

g(x) = (1-2x)^2(x-3)

Thanks :)

So I am trying to trick someone and I need questions to ask to try to do so. One example would be:

Q: What is heavier, a ton of feathers or a ton of bricks?

A: they're the same, they both weigh a pound.

Does anyone know any questions like this that I can use to trick people?

Thanks :)

How can I solve this?

Cotx = sinxsin(pi/2) + cos^2 x cotx

Thanks :)

How can I prove this?

(sin2x)/(1 - cos2x) = 2csc2x - tanx

Thanks :)

When you go in the water and then get out of it, you are wet. But, are you wet when you're underwater, or just when you come out of the water?

How do I solve this?

Find the slope of the tangent of f(x) = 2^(x^2 + 3x) when x = 3.

Thanks :)