# 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...
35 replies | 1488 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 | 851 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 | 1014 view(s)
• 12-26-2018, 07:12 PM
Denis started a thread Bang rebus in Math Odds & Ends
sgeuant (1)
26 replies | 1240 view(s)
• 12-24-2018, 07:47 PM
y = sin(alpha) What is the domain of y is between -1 to 1?
23 replies | 1094 view(s)
• 01-11-2019, 11:24 PM
Go back again for a few hours.
30 replies | 679 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? ...
20 replies | 884 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...
23 replies | 774 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 | 1112 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 | 642 view(s)
• 01-20-2019, 01:23 AM
I have a homework problem and it goes like this: "Suppose T1(N) = O(f(N)) and T2(N) = O(f(N)). Which of the following are true? (Goes on to...
24 replies | 440 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 | 817 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...
12 replies | 1079 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 | 910 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 | 844 view(s)
• 01-15-2019, 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...
15 replies | 613 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 | 764 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 | 474 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 | 445 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 | 818 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 | 626 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 | 612 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 | 380 view(s)
• 01-18-2019, 02:18 PM
Hi ive recently had a question that i can't get my head across. The equation is: (4+2i)(A+B)=6+7i The question asks to multiply out the let...
12 replies | 396 view(s)
• 01-18-2019, 02:57 PM
Denis started a thread Color crypt in Math Odds & Ends
Prime circular number not known (4) no e
14 replies | 380 view(s)
• 01-12-2019, 01:30 PM
I have Been asked to calculate the Probability of being able to Predict What cards will Come out in which Order in a 52 Pack of Cards, I have been...
10 replies | 463 view(s)
• 01-15-2019, 02:42 PM
Denis started a thread 3 rebuses in Math Odds & Ends
va ders (2) bbbband (3) gun,jr (4)
13 replies | 546 view(s)
• 01-18-2019, 03:04 AM
say: x < 5y and I wanted to apply log to both sides: log x < log 5y What would the base be for each logarithm? Can we assume it is 10?...
11 replies | 402 view(s)
• 01-06-2019, 11:43 PM
A3. The equation a^3 + b^3 + c^3 = 2008 has a solution in which a; b; and c aredistinct even positive integers. Find a + b + c. :confused: Multiple...
10 replies | 392 view(s)
• 12-29-2018, 04:54 PM
Here is the equation to be solved for x--it is actually z but I use x in my handwritten working out (attached) to avoid confusion of z with 2: ...
9 replies | 680 view(s)
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