zhengcl86
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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 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

vivianrush:
Group Title
Is there any bias in the survey question? Explain.
What do think would help students pay more attention in class?
 updated one year ago
 3 replies
 1 Medal
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

busbus__Hehe:
Group Title
3(6x9) Help... Please
 updated one year ago
 7 replies
 No Medals Yet
Mathematics

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

overtonka:
Group Title
solve each system of equations
c+2d=12
c+d=2
 updated one year ago
 9 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 one year 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 one year ago
 3 replies
 1 Medal
Mathematics

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

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

Danny_Boy:
Group Title
True or False? Based on the information marked in the diagram, ABC DEF.
 updated one year ago
 4 replies
 1 Medal
Mathematics

missylyn1990:
Group Title
(3y^27y9)(4y^2+6y+9)
combine like terms
 updated one year ago
 19 replies
 1 Medal
Mathematics

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

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

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

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

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