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• Yesterday, 10:04 PM
Let's guess that you just want a formula to produce the values you show here. You have a linear relationship y = f(x), where f(0.5) = 0.00011, and an...
8 replies | 95 view(s)
• Yesterday, 09:49 PM
Perfect square trinomials are a very special case, (a+b)^2 = a^2 + 2ab + b^2. If the first and last terms of a trinomial are squares, it may have...
3 replies | 31 view(s)
• Yesterday, 07:12 PM
Presumably, you are talking about the same tent as the picture you showed in the other question. One way to do it is to draw in a sleeping bag or...
2 replies | 47 view(s)
• Yesterday, 07:02 PM
What is your context, so we can know what kinds of answers are suitable? What have you learned about series? Also, I'm not quite sure whether...
3 replies | 44 view(s)
• Yesterday, 05:58 PM
Your question was not about introducing the topic to children, but about what is correct, or how they are "usually" read. Moreover, "two fives and...
10 replies | 78 view(s)
• Yesterday, 05:46 PM
Yes, and I still have no idea what "scaling standard deviation" means. I'm just waiting to see if someone else has an idea.
8 replies | 95 view(s)
• Yesterday, 01:48 PM
In order to give specific help, we need to know whether your equations are wrong, or you are wrong about not being able to solve them. Can you at...
2 replies | 27 view(s)
• Yesterday, 01:12 PM
The "official" rule is that other than base ten, you just read out the digits: "two one base five". If I say "twenty-one base five", I know I'll...
10 replies | 78 view(s)
• Yesterday, 10:47 AM
Two more comments: 1. I think one of the pages I referred to swaps the roles of phi and theta, as is commonly done, so don't let that confuse you....
5 replies | 60 view(s)
• Yesterday, 10:18 AM
As I see it, you are trying to derive the volume element informally (as a picture), as opposed to the formal derivation in a link from the page I...
5 replies | 60 view(s)
• Yesterday, 09:44 AM
As I suggested before, there are really two issues: to define what is "closest", and to implement a solution. You have touched on both. Your idea...
3 replies | 65 view(s)
• Yesterday, 09:12 AM
I think you are talking about spherical coordinates, using r for rho, @ for phi, and & for theta. This is more than just polar coordinates, which are...
5 replies | 60 view(s)
• Yesterday, 08:10 AM
I'm sorry, I still don't understand what you are trying to do. You have hinted, now, at some context that had not been mentioned before, and it...
8 replies | 95 view(s)
• Yesterday, 08:06 AM
Yes, the exact wording of a problem is important here, because the problems themselves are highly sensitive to slight changes. It's not primarily an...
8 replies | 103 view(s)
• 10-16-2018, 10:33 PM
This seems like a challenging problem. Is it for a class in which you have learned some particular techniques that might be relevant (I would...
3 replies | 65 view(s)
• 10-16-2018, 10:21 PM
Combinations of horizontal transformations are tricky; but you have made only one mistake. It is easy to avoid if you focus on the x; but that is...
1 replies | 53 view(s)
• 10-16-2018, 09:56 PM
To examine the trick algebraically, you have to represent it algebraically. You have two (two-digit?) numbers with the same first digit, so maybe...
2 replies | 70 view(s)
• 10-16-2018, 08:21 PM
Yes, there is an easy way. Because the triangles are similar, corresponding parts are similar. So the ratio of the horizontal sides equals the ratio...
2 replies | 65 view(s)
• 10-16-2018, 08:17 PM
I wouldn't want to give you the answer in the first place; the site's policy is not to do so until it seems appropriate. In fact, I won't give you...
1 replies | 28 view(s)
• 10-16-2018, 07:22 PM
I'm trying to follow your reasoning in order to see where you went wrong, but I'm not sure exactly what you did. Can you state the actual calculation...
8 replies | 103 view(s)
• 10-16-2018, 01:54 PM
When I put the zeros on the number line, I immediately take note of whether they themselves are solutions, before looking at the intervals. In this...
3 replies | 55 view(s)
• 10-16-2018, 09:55 AM
In English, this is an ambiguous statement, which therefore shouldn't be made, as it confuses people. Rather, mathematically, zero is the size of...
5 replies | 169 view(s)
• 10-15-2018, 11:20 PM
I'm not sure what you mean by "scaling standard deviation". What is it that has a standard deviation of .0001, and what do x and y represent? Can...
8 replies | 95 view(s)
• 10-15-2018, 06:16 PM
Radians should be thought of as dimensionless, since they are defined as a length over a length. So there is no conflict. (The term "radian" is...
14 replies | 346 view(s)
• 10-15-2018, 11:01 AM
Keep in mind that this arose when you were wrongly taking r as a constant; so that your integral represents not a triangle, but part of a circle. ...
14 replies | 346 view(s)
• 10-14-2018, 11:05 PM
So, when you asked about "possible values of the pdf", you were really asking for "possible values" of the random variable, in the sense of values of...
4 replies | 127 view(s)
• 10-14-2018, 10:27 PM
Okay, it looks like they just want an approximate sketch first, so you see what the situation is like. Then they are leading you through a...
9 replies | 166 view(s)
• 10-14-2018, 09:23 PM
Then I guess they just want you to draw a picture, as accurately as you want. Can you tell us anything more? See our guidelines for suggestions....
9 replies | 166 view(s)
• 10-14-2018, 09:20 PM
Okay, since you already know the area formula, I imagine that you are just experimenting, trying out alternative ways to find the area to see what...
14 replies | 346 view(s)
• 10-14-2018, 09:05 PM
They won't be "random" tangents; they will be the two tangents that pass through that point. Presumably you are expected to locate them accurately,...
9 replies | 166 view(s)
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About Dr.Peterson

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##### About Dr.Peterson
Biography:
I was a software engineer for many years, and have been teaching at a community college since 2004. Since 1998, I was a part of Ask Doctor Math (http://mathforum.org/dr.math/ and now http://themathdoctors.org/).
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Rochester, NY

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