Edward, these two identities are inherent to the idea of a function operating on a variable (or variables, or on anything else!). A function is a mapping of the first thing onto a second thing -- that is, each element of the first thing becomes a distinct
element of the second thing. The inverse...

Hi Jamis,
This is easy -- call the price of 1 apple = x, the price of 1 bag of chips = y, transform the word problem into equations (that's two equations:
5x + 8y = 29 and 3x + 4y = 15), and solve those two equations for x and y, such as by elimination of first x, then substitute...

Mary,
This is an interesting problem, but not necessarily only from the statistical point of view! As statistics, you look for the probability for n=25 that the number of Facebook friends is at or exceeds 190. Since the expected sample deviation of this sample
scales with (n-1)^0.5, you could...

Bri,
What's the problem here? You may assume that the variable x is distributed ONLY in the interval of 70 to 90 (that's a range of 20, I hope you appreciate!).
Then, when you consider the range from 80 to 95, it's only populated with x up to the value 90, so that's a populated range (i...

Kitty,
most likely you've already cleared this up in your classwork, but if not, here are some general thoughts.
1) Moles and grams are both units of measure, but they are measured in different ways and used for different purposes.
Grams is a unit of mass (weight, you might think of...

Bobby,
That's an odd question -- do you mean that you synthesized the aspirin and tested it to be 100% pure, or what? You've just stated two facts; unless you propose a hypothesis of why that might be so, there's nothing to be wrong about, yet! That being said,
IF the stated assay values...

Kenzie,
No way is this general chemistry! Physics!
But anyway, if you haven't already gotten your answer, you just need to plug into the appropriate form of the Heisenberg Uncertainty Principle, such as ΔxΔp ≥ h.bar.
(h.bar. is h/2π)
This is certainly a weird problem, since...

Amber,
Since you didn't indicate the reaction conditions (i.e., are you using a reaction to generate the bromine, or neat bromine directly?), I'm only guessing that the cyclohexene is used to scavenge any residual bromine. The dibrominated stilbene isomers can
then be purified (well, together,...

Dear Alena,
Nitroglycerin is considered to explode as:
4 C3H5N3O9 --> 12 CO2 + 10 H2O + 6 N2+O2
It does so nicely -- just drip some from a syringe onto the floor, and it explodes with little pops (note: you would only use a microsyringe, such as a 10 μL one, to gently...

Symmeatra,
In order, the steps you need to follow to solve this problem are:
1) determine the molecular mass of CH3I from its formula
2) determine how many moles of CH3I the stated mass provided represents
3) plug this # moles into the general gas law pV = nRT ; use the appropriate...

Roo,
See the equation you need to use, in the answer to your other question. Remember that all gases (ideal gases, anyway, which is how you calculate them unless you have specific data otherwise!) behave EXACTLY the same; the only thing that matters is how
many molecules of gas or gases are...

Mohammed,
Please, please check over your submitted questions for typographical errors before you send them! If you don't care enough to submit an error-free question, why would someone care enough to help you find an error-free answer? And more importantly for the
future, who would want to...

Habeeba,
Your question is total mush. Please restate the physical situation, the proposed allowed travel moves of the "he", and the desired end result -- is it number of distinct paths, average length of path, or what? (If you let the "he" wander around on a 4
x 4 matrix...

I've taught environmental science, and this question exemplifies the issues with the sloppy terminology commonly found in such course materials (since the school district I taught in wasn't sufficiently organized to decide on and provide a textbook, I
wasn't particularly constrained by that!)...

Charissa,
Your question is a little confusingly stated; it's not stated in a way that can be interpreted clearly because "top farming states" doesn't allow matching with "most land". Do you mean, among all states with the majority of their area used for farming
(that you...

Roo,
In questions of this type, first you need to "get" the chemistry involved, then you need to set up your equation and solve it.
For the chemistry, you need to recognize that Cl and I are both halogens, and the one is substituting for the other in the reaction that takes place...

John,
Assuming you haven't yet solved this type of problem:
1) Recognize that AgCl is the white precipitate. From the 11.165 g of it, find the # moles of it. That is then equal to the # moles of Cl^- ions originally present.
2) From the given freezing point and the freezing point constant...

Look Tim,
This is a typical word --> math problem. Solving such problems requires, mostly, just the technique of translating the English statement into a mathematical one. The solution to the math problem is usually then quite easy!
So then ---
Always ask yourself for problems like...

Charissa,
From your statement, it's not clear whether you don't understand the *question*, or you don't understand how to answer it. So I'll go through both of these.
First, let's break the question down into language you might understand. "Assuming it were...

Dear Jerri,
For the general case of any function f, this is not uniquely soluble, because an infinite number of possible different functions will all run through any finite set of data points. If, however, you *assume* that f is a linear algebraic function, you can
work it.
For the graph...