zhengcl86
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 24
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 5
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 2

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 0
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 Questions Asked
 1
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 0
 Medals Received
 0

 Questions Asked
 24
 Questions Answered
 5
 Medals Received
 2

0 
Questions Asked

zhengcl86:
Group Title
Solving recurrence relation?
a(n)  6a(n1) + 8a(n2) = 0 , n > 2 , a(0) = 2 , a(1) = 4
 updated one year ago
 22 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Injective and Surjective
Consider f: R  R given by f(x) = x^2  2x. Given an example to show that f(x) is not injective. Explain why f(x…
 updated one year ago
 2 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
Proof by contradiction
Theorem: The reciprocal of any irrational number is irrational.
 updated one year ago
 6 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
True or False
A complete graph Kn has (n1)! Hamiltonian cycles
 updated one year ago
 2 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
True or False Question
Let A = R and define a relation R to be a R b if and only if a < b then R is transitive
 updated one year ago
 12 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
Prove the folliwing combinatorial identity if 1≤k<n . this identity is known as the hexagon identity and relates terms in pascal's triangle
 updated one year ago
 5 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Newton's Law of Cooling
A Cup of coffee placed in a room cools from 160F to 150F in one minute. If the room temperature is 65F, Find the …
 updated one year ago
 30 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
Proof by contradiction would be used for which of the following?
A) The proof that the square root of five is irrational.
B) The proof tha…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

zhengcl86:
Group Title
True or False Logics
5 is a whole number or 5 is an even number
 updated one year ago
 16 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
Modular Arithmetic
5=2(mod 3)
(13)(mod 5)
…
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Modular Arithmetic
(3+4)(mod 5)
(4 x 3)(mod 5)…
 updated one year ago
 3 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
Union and Intersections
Let A= {xx is a prime factor of 720}
…
 updated 2 years ago
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Give a counterexample for x E R, (square root of)x < x
 updated 2 years ago
 3 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Determine all the elements in each of the following sets
{n0=(n2)(3n+1)(n4), n (is an element of) N}
…
 updated 2 years ago
 6 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
True or False, Set Theory !! help
Let the universal set U be U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and let T = {3, 6, 7} then T ' = {1,2,4,5,…
 updated 2 years ago
 3 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
venn diagram help!
 updated 2 years ago
 3 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
universal set U help
 updated 2 years ago
 1 reply
 No Medals Yet
Mathematics

zhengcl86:
Group Title
write the set in form where P(x)
helpppp
 updated 2 years ago
 1 reply
 No Medals Yet
Mathematics

zhengcl86:
Group Title
set theory: In each part, give the set of letters in each word by listing the elements of the set.
AARDVARK…
 updated 2 years ago
 No Medals Yet
Mathematics

zhengcl86:
Group Title
discriminant to determine the type of solutions of the equation
 updated 2 years ago
 5 replies
 No Medals Yet
Mathematics

zhengcl86:
Group Title
Finding the Vertex of the Parabola!!! WHAT!!!????
 updated 2 years ago
 30 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
need help solving some basic algebra question to the 3rd power!!
 updated 2 years ago
 20 replies
 1 Medal
Mathematics

zhengcl86:
Group Title
determine the domain of \[f(x)=\sqrt{9x ^{2}}\]
 updated 2 years ago
 19 replies
 2 Medals
Mathematics

zhengcl86:
Group Title
domain of f(x)=sq 9x/squared
 updated 2 years ago
 1 reply
 No Medals Yet
Mathematics