RolyPoly
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Questions Answered

cheese809:
Group Title
Find the angle between the given vectors to the nearest tenth of a degree.
u = <8, 7>, v = <9, 7>
…
 updated 8 months ago
 11 replies
 1 Medal
Mathematics

madelinm21:
Group Title
Let U = {4, 8, 12, 16, 20, 24, 28, 32} and A = {12, 16, 20, 28}. Find A
 updated 8 months ago
 2 replies
 No Medals Yet
Mathematics

cheese809:
Group Title
Find a ⋅ b.
a = <5, 2>, b = <4, 5>
 updated 8 months ago
 10 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Let A and B be square matrices of the same size. If A and B are both ______, so is AB.
1) symmetric
2) invertible
…
 updated 10 months ago
 31 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Let A be a 4x7 matrix with rank 4. Which of the following(s) is/are true?
1) the rows of A are linearly independent
2) the columns of A mu…
 updated 10 months ago
 12 replies
 1 Medal
Mathematics

BethanyAmanda:
Group Title
a website requires a four digit password in which the numbers cannot repeat how many different combinations are there
 updated 11 months ago
 1 reply
 No Medals Yet
Mathematics

RolyPoly:
Group Title
Find the range of the function \(f(x) = x^\frac{1}{x}\)
 updated 11 months ago
 11 replies
 7 Medals
Mathematics

irm:
Group Title
(xy)dx + xdy = 0
 updated one year ago
 1 reply
 1 Medal
Mathematics

RolyPoly:
Group Title
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 one year ago
 3 replies
 2 Medals
Mathematics

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

freshkid944:
Group Title
5^x=13
 updated one year ago
 11 replies
 No Medals Yet
Mathematics

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

RolyPoly:
Group Title
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 one year ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
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 one year ago
 33 replies
 3 Medals
Mathematics

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

RolyPoly:
Group Title
Given an undirected graph H, let C be the adjacency matrix of H. What is the meaning of entries in \(C^n\)?
 updated one year ago
 20 replies
 2 Medals
Mathematics

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

bolobolo:
Group Title
integral checking
 updated one year ago
 8 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
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 year ago
 13 replies
 No Medals Yet
Mathematics

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

Jayinmn:
Group Title
Prove that for any integer n, n(n+1)/2 is also an integer.
 updated 8 months ago
 4 replies
 2 Medals
Mathematics

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

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

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

Ssusu:
Group Title
find max value of function f(x)=1xx^2
 updated one year ago
 14 replies
 3 Medals
Mathematics

Kainui:
Group Title
Is this a legitimate way to calculate integrals:
 updated one year ago
 13 replies
 5 Medals
Mathematics

DUDE..IM..A..DUCK:
Group Title
what is the derivative of pi^2.
 updated one year ago
 25 replies
 6 Medals
Mathematics

Christos:
Group Title
Reduction formula!
…
 updated one year ago
 8 replies
 3 Medals
Mathematics

kryton1212:
Group Title
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 one year ago
 8 replies
 1 Medal
Mathematics

ygarcia:
Group Title
Find COS 23pi/6?
 updated one year ago
 76 replies
 1 Medal
Mathematics

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