RolyPoly
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Questions Answered

irm:
(xy)dx + xdy = 0
 updated yesterday
 1 reply
 1 Medal
Mathematics

RolyPoly:
Is this statement true?
"If U, W are subspaces of \(\mathbb{R}^n\) and dim U + dim W = n, then \(U\cap W = {0}\)"
 updated yesterday
 2 replies
 2 Medals
Mathematics

suzanka:
Solving linear equation with matrices
So, we were taught how to solve linear equations using the GaussJordan algorithm. What bothers me …
 updated yesterday
 15 replies
 2 Medals
Mathematics

freshkid944:
5^x=13
 updated 3 days ago
 11 replies
 No Medals Yet
Mathematics

RolyPoly:
What can you tell about the eigenvalues of matrix \(A^2\) if an eigenvalue of matrix \(A\) is \(\lambda\) and the corresponding eigenvector…
 updated 14 days ago
 1 reply
 No Medals Yet
Mathematics

RolyPoly:
The number of passengers of terminal A, A(n) and terminal B, B(n), in the nth year are \(A(n)=2pq^n\) and \(B(n) = npq^2\), where p and q ar…
 updated 7 days ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
A student committee consists of 20 boys and 15 girls. A team of 8 students is selected randomly from the committee to participate in an acti…
 updated 16 days ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
Why do we use radian instead of degree in "higher mathematics", for example, in calculus?
 updated 27 days ago
 9 replies
 No Medals Yet
Mathematics

RolyPoly:
Given an undirected graph H, let C be the adjacency matrix of H. What is the meaning of entries in \(C^n\)?
 updated 28 days ago
 20 replies
 1 Medal
Mathematics

alooy:
Inverse Laplace Transform (2s^2+4s+8)/(s^2+4)(s^2+2s+1)
 updated one month ago
 4 replies
 4 Medals
Mathematics

bolobolo:
integral checking
 updated one month ago
 8 replies
 No Medals Yet
Mathematics

RolyPoly:
Write a recursive algorithm S(C,D,m,n) with the following requirements:
1) C is an array with m elements stored in positions C[1,...,m]
2)…
 updated one month ago
 13 replies
 No Medals Yet
Mathematics

RolyPoly:
Use MI to prove that \(n^21\) is divisible by 8 for any positive odd integer n.
 updated 2 months ago
 8 replies
 1 Medal
Mathematics

Jayinmn:
Prove that for any integer n, n(n+1)/2 is also an integer.
 updated 2 months ago
 2 replies
 1 Medal
Mathematics

RolyPoly:
Solve the following recurrence:
\[f(x) =\begin{cases} x & x \le 3 \\ f(x3) + 4 & x > 3\end{cases}\]
 updated 2 months ago
 76 replies
 2 Medals
Mathematics

RolyPoly:
<Linear Algebra>
Prove that a system of linear equations cannot have exactly two solutions.
 updated one month ago
 23 replies
 2 Medals
Mathematics

RolyPoly:
<Linear Algebra>
In the process of solving a system of linear equations, we have three elementary row operations, which are
(I) Exchange t…
 updated 2 months ago
 39 replies
 3 Medals
Mathematics

Ssusu:
find max value of function f(x)=1xx^2
 updated 2 months ago
 14 replies
 2 Medals
Mathematics

Kainui:
Is this a legitimate way to calculate integrals:
 updated 3 months ago
 13 replies
 5 Medals
Mathematics

DUDE..IM..A..DUCK:
what is the derivative of pi^2.
 updated 3 months ago
 25 replies
 6 Medals
Mathematics

Christos:
Reduction formula!
…
 updated 3 months ago
 8 replies
 3 Medals
Mathematics

kryton1212:
Two fair dice were rolled once.
(a) What is the probability of getting a sum of 7?
(b) What is the probability of getting a sum greater th…
 updated 2 months ago
 8 replies
 1 Medal
Mathematics

ygarcia:
Find COS 23pi/6?
 updated 3 months ago
 76 replies
 1 Medal
Mathematics

gabriel72alv:
(3w^3 x^6)^3
Write your answer using only positive exponents.
 updated 3 months ago
 22 replies
 2 Medals
Mathematics

cassieblake:
Sanjay has $65 to spend at the mall. He bought a Tshirt for $18 and a belt for $14. If Sanjay wants a pair of jeans, how much can he spend?
 updated 3 months ago
 1 reply
 No Medals Yet
Mathematics

ccastudent775:
solve the equation 2v  7 = 23
 updated 3 months ago
 5 replies
 1 Medal
Mathematics

_mr_joey_:
Can anyone explain to me the distance formula in geometry ?
 updated 3 months ago
 4 replies
 No Medals Yet
Mathematics

tswavy:
Find the distance between the points (1, 2) and (4, 3).
…
 updated 3 months ago
 1 reply
 1 Medal
Mathematics

iamthecookiemonster:
.Write the direct linear variation equation for the relationship:
y varies directly with x and y = 4 when x = 12.
…
 updated 3 months ago
 1 reply
 1 Medal
Mathematics

yesy7:
Find all solutions in the interval [0, 2π).
(sin x)(cos x) = 0
 updated 3 months ago
 7 replies
 2 Medals
Mathematics
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