# Activity Stream

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• 01-03-2019, 05:33 PM
The number 2019, its double 4038, and its triple 6057 contain all 10 digits. I am interested in the next number with this property? I have found one...
34 replies | 1294 view(s)
• 01-09-2019, 07:55 PM
This seems to be a very simple equation...but somehow the solution is eluding me. I have tried again and again and can't get it to come out right....
32 replies | 680 view(s)
• 01-10-2019, 09:21 PM
Hi there :) Would like a little help on this problem here if thats ok? Your help is greatly appreciated! I have worked out the equation for...
31 replies | 812 view(s)
• 12-26-2018, 07:12 PM
Denis started a thread Bang rebus in Math Odds & Ends
sgeuant (1)
26 replies | 1213 view(s)
• 12-19-2018, 01:39 PM
Just discovered that: if n is a 4 digit number such that the 2 digit number formed by its 1st 2 digits is 1 greater than the 2 digit number formed...
26 replies | 880 view(s)
• 01-11-2019, 11:24 PM
Go back again for a few hours.
30 replies | 520 view(s)
• 12-24-2018, 07:47 PM
y = sin(alpha) What is the domain of y is between -1 to 1?
19 replies | 865 view(s)
• 01-12-2019, 08:38 PM
A guy wire has to run from the top of one telephone pole to the top of a 2nd pole but has to be anchored to the ground between the two poles. The...
22 replies | 613 view(s)
• 12-19-2018, 11:11 AM
Hi, I am a newbie to calculus and having trouble with understanding need for calculus. My view was that all information can be inferred from a...
17 replies | 838 view(s)
• 01-14-2019, 12:58 PM
Something that puzzles me: The square roots of 100 are + or -10, yes? So why when one simplifies surds are we able to ignore negative roots? ...
19 replies | 428 view(s)
• 12-30-2018, 05:58 PM
Hi. I'm trying to calculate the expected value of X using this graph and I'm really struggling for some reason. Can anyone please help? The...
16 replies | 1080 view(s)
• 12-26-2018, 12:00 PM
How to prove sin 45 = 1/root 2 and root 2/2 same thing? I am confused.
14 replies | 784 view(s)
• 01-07-2019, 01:47 PM
Solve: cos^−1(2x) + sin^−1(x) = π/3 I don't know where to begin with this one, other than π/3 = 60 degrees.
19 replies | 541 view(s)
• 12-29-2018, 04:38 PM
"Greg and Kristine are on opposite ends of a zip line that crosses a gorge. Greg went across the gorge first, and he's now on a ledge that's 15 m...
13 replies | 864 view(s)
• 12-22-2018, 08:18 PM
What is the best calculator for algebra? I want to use it more to check my work than to have it do the work for me. I am not as lazy as Lucy but...
14 replies | 817 view(s)
• 12-22-2018, 08:49 PM
A young adult I was tutoring asked me this question: m = 6.29, k = 0.0882 m = (n/(n+1)) * k^ (-1/n) - solve for N. - I couldn't get around...
12 replies | 728 view(s)
• 12-26-2018, 03:40 AM
Hi there, As those of you who kindly answered my previous posts will know, I'm self studying algebra from a book called 'Teach yourself algebra: a...
11 replies | 985 view(s)
• 01-04-2019, 09:33 AM
Hi all I was hoping someone could help me confirm whether the following question was correct. The question is; Find the 1st and 2nd derivative...
16 replies | 440 view(s)
• 01-05-2019, 08:24 PM
Here is problem: Here is how I solved it: Here is the solution in back of the book: Now, how can this be? I mean, all you need to do...
16 replies | 359 view(s)
• 12-21-2018, 08:46 PM
Denis started a thread Timely crypt in Math Odds & Ends
Celebration is missing a letter, we hear (4) 1 e
13 replies | 822 view(s)
• 12-17-2018, 11:36 AM
Hi! I need some help with exponential equations and logarithms.The following exercises were on my test ,but I wasn't able to resolve most of them...
14 replies | 508 view(s)
• 12-22-2018, 01:51 AM
pig---s (1)
13 replies | 790 view(s)
• 12-30-2018, 02:38 PM
I understand functions can only be one-to-one or many-to-one ( like f(x) = x^2), is there a reason why we choose to not define functions as...
13 replies | 773 view(s)
• 12-17-2018, 07:40 PM
ABCD is a trapezoid whose diagonals AC and BD intersect at the point E. If AB = 2/3 DC, prove that AE = 3/5 AB + 2/5 AD. My teacher recommended...
14 replies | 549 view(s)
• 01-13-2019, 01:47 PM
According to Pythagoreans theorem these are an unexplained properties of all triangles without using the Law of Sine and Cosine. (c\times\sin...
14 replies | 544 view(s)
• 01-02-2019, 12:26 PM
The calculation for determining the finance charge per $100.00 is determined by the following: Finance Charge/Amount financed *$100.00 = the...
12 replies | 555 view(s)
• Yesterday, 03:15 PM
"The flask shown is constructed from a glass sphere and cylinder. Neglecting the Thickness of the glass and assuming no loss of volume from joining...
14 replies | 252 view(s)
• 12-19-2018, 12:36 AM
Hey everyone... my first post! I am working on some mapping software, and I need to be able to calculate the latitude on a graph as the user moves...
12 replies | 744 view(s)
• 12-21-2018, 05:41 PM
:???: Usually the vertices have a solid point on the graph which gives you something to work with easily, however, I am slightly puzzled on these...
9 replies | 724 view(s)
• 01-09-2019, 02:34 PM
prdk21 started a thread Equation of free fall in Calculus
so here is the question: "The equations for free fall at the surfaces of Pluto is s = 5.28t^2; where s is in meters, and t is in seconds. How...
14 replies | 290 view(s)
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