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• Yesterday, 11:43 PM
I avoided this method, as it seems likely to be more algebra than the students taking the test would know; but the visual part of it is very nice....
15 replies | 254 view(s)
• Yesterday, 10:18 PM
Please at least state the problem clearly. Can you confirm that the problem is to prove a vector equation, not just a statement about lengths as you...
6 replies | 75 view(s)
• Yesterday, 09:18 PM
The bell-shaped curve has to be a histogram. You just plotted the individual values as a bar graph in increasing order, which is not the same.
2 replies | 31 view(s)
• Yesterday, 09:13 PM
Are you saying that you know nothing at all about Venn diagrams, or just that you haven't bothered to try solving this problem? We need a place to...
5 replies | 250 view(s)
• Yesterday, 09:02 PM
I'm not sure what you mean by "the total area by the paths"; but there is no square here whose area is 32 cm2, so taking the square root of that is...
15 replies | 254 view(s)
• Yesterday, 08:53 PM
I take it, then, that although you posted under Arithmetic, an algebraic solution is acceptable? Good work. That's a little different in detail...
10 replies | 268 view(s)
• Yesterday, 08:41 PM
It really helps when you show the problem as given, along with your work! (We ask you to do that, here.) We've also now learned something about the...
6 replies | 104 view(s)
• Yesterday, 08:22 PM
I can't follow your reasoning; it looks like you are starting with what you were told to prove. I'm also not sure what you were told to prove, as...
6 replies | 75 view(s)
• Yesterday, 12:51 PM
Have you read our guidelines for submission? You should know that we want to see your own thoughts, so we can tell where you need help. We don't just...
3 replies | 65 view(s)
• Yesterday, 11:13 AM
Presumably, the intention is that n is chosen randomly from a uniform distribution. So they are really asking what percentage of those 96 numbers are...
12 replies | 124 view(s)
• Yesterday, 11:07 AM
I think it will help if you state the entire problem, as given to you. It sounds like you are trying to count the number of ways to cover an n x...
6 replies | 104 view(s)
• 12-16-2018, 10:53 PM
Since this is a definite integral, my first thought was to wonder if there is something special about the interval. In particular, maybe over there...
3 replies | 133 view(s)
• 12-16-2018, 05:34 PM
Rotating would mess it up; but it's important that it is not the width, but the vertical distance across the slanted path, that is given as 2 inches....
15 replies | 254 view(s)
• 12-16-2018, 12:13 AM
Plug in only one solution at a time! It is probably getting confused: ²+10=-8 ²+10=-8
4 replies | 202 view(s)
• 12-15-2018, 11:34 PM
It will be helpful if you can pass on to us what methods he has used recently in class. Assuming he is not yet learning algebra proper (though this...
8 replies | 235 view(s)
• 12-15-2018, 11:27 PM
Presumably it's the total area of the shaded portion whose area is given. I have a sort of trick solution that makes it very easy. We know that...
15 replies | 254 view(s)
• 12-15-2018, 05:37 PM
It can definitely be solved by simultaneous equations. You have three equations in three variables, along with an inequality (which isn't needed to...
4 replies | 180 view(s)
• 12-15-2018, 01:38 PM
I guess the student just has to ask the teacher what the question means. Either something has been said in class but not heard, or the teacher is...
7 replies | 245 view(s)
• 12-15-2018, 10:58 AM
I tried searching for "structures maths" and found nothing to suggest it is a common name for a topic or course. Clearly the question assumes the...
7 replies | 245 view(s)
• 12-14-2018, 03:49 PM
Well, the thread title is " Indefinite integral with continous funtions problem"; and in order to have the stated (continuous) derivative f(x), F(x)...
13 replies | 350 view(s)
• 12-14-2018, 02:07 PM
You'll have to put this C2 into the second case, and then find C1 to make the function continuous. (It is not -8 this time.) THEN you can evaluate...
13 replies | 350 view(s)
• 12-14-2018, 11:17 AM
Dr.Peterson replied to a thread Logic Question in Advanced Math
If the context were mathematical (say, they were about to do a calculation based on the proportionality statement, and didn't already have the...
16 replies | 413 view(s)
• 12-13-2018, 08:33 PM
I initially thought we'd need to know what kind of numbers are allowed, and whether they can repeat, but when I actually tried it, I found the same...
10 replies | 268 view(s)
• 12-13-2018, 07:54 PM
Please don't post links to that site, which is forbidden. Here is your image: Your answer is F(x) = { x^2 - x - 8, x <= 1 .........{...
13 replies | 350 view(s)
• 12-13-2018, 05:52 PM
I think I told you what to do. Please try, and show me your work. (Presumably you have been taught what to do, as well.) The first step, as I...
13 replies | 350 view(s)
• 12-13-2018, 05:00 PM
It doesn't make much sense to me. The page says at one point, Is there anything about the curve that you think is not true to the mathematical...
2 replies | 156 view(s)
• 12-13-2018, 04:55 PM
I think you've misunderstood the role of F(4)=-8 in the problem. It is not just a check. Any function has many antiderivatives, not just one. They...
13 replies | 350 view(s)
• 12-13-2018, 03:16 PM
The key idea is that you have to do exactly 60 multiplications or divisions. (I missed that at first.) For example, you can get 12 by multiplying...
12 replies | 343 view(s)
• 12-13-2018, 10:57 AM
Can you show your work, so we can see why you think it didn't lead to the correct answer (or correct form)? It isn't clear what you are lacking.
3 replies | 180 view(s)
• 12-13-2018, 10:51 AM
I would agree. It is a linear equation with an added restriction, not a true linear equation.
1 replies | 180 view(s)
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About Dr.Peterson

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##### About Dr.Peterson
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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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