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Questions Answered

adaytoheather:
Group Title
Solve the system using matrices. 3x + 4y = 18 3x + 4y = 18
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

zohra.sharief:
Group Title
y = x^2  x  2 where x = 1
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

MandyMicheala:
Group Title
Reduce ech ration to it's simplest form.
14:21 and 8:16
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

e.g.1:
Group Title
Please see the attached!!
 updated one year ago
 2 replies
 1 Medal
Mathematics

frx:
Group Title
Show that if \[2^{m}+1\] is prime then
\[m=2^{n}\] \[n \in \mathbb{N} \]
Guidance: \[m=r*2^{n}\]
…
 updated one year ago
 25 replies
 1 Medal
Mathematics

frx:
Group Title
Proove that two Fermat numbers always are relatively prime. I have the lead that F_m  (F_n  2) for m<n.
 updated one year ago
 45 replies
 1 Medal
Mathematics

joshisabeast:
Group Title
Whats an integer
 updated one year ago
 4 replies
 No Medals Yet
Mathematics

frx:
Group Title
I need help to proof that fermat numbers always are relatively prime. I've got the lead that \[F_{m}(F _{n}2), ...where... m<n\] and that…
 updated one year ago
 5 replies
 No Medals Yet
Mathematics

trenvilla:
Group Title
Use the Binomial Theorem to expand the binomial. (d – 4b)3
 updated one year ago
 4 replies
 No Medals Yet
Mathematics

frx:
Group Title
Show that if r is a positive odd integer then the polynomial \[x ^{r}+1\] is dividable by \[x+1\]
 updated one year ago
 9 replies
 1 Medal
Mathematics

frx:
Group Title
For which values of the constant a does the equationsystem have infinty many solutions and then doesn't any solutions exist.
\[ax _{1} +(a…
 updated one year ago
 9 replies
 1 Medal
Mathematics

frx:
Group Title
For which value on the real constant a were the line L intersects the point (4,1,3), with the direction vector (3,a,2), the plane \[(x,y,z)=…
 updated one year ago
 12 replies
 2 Medals
Mathematics

frx:
Group Title
Show that the equation \[z ^{3}+(3+i)z^{2}+(63i)z+(68i)=0\] has a pure imaginary root and then solve the equation.
I know how to sol…
 updated one year ago
 7 replies
 2 Medals
Mathematics

frx:
Group Title
Let a>0
(a). Show using L'Hospitals rule that:
\[\lim_{x \rightarrow 0} x ^{a}\ln(x)=0\]
…
 updated one year ago
 46 replies
 2 Medals
Mathematics

frx:
Group Title
Show that \[x ^{2}+18\ln(x)+11>12x \] for x>1, I have no idea how to do the 18ln(x) messes things up for me...
 updated one year ago
 7 replies
 2 Medals
Mathematics

frx:
Group Title
Show that \[x ^{2}+18\ln(x)+11>12x \] for x>1, I have no idea how to do the 18ln(x) messes things up for me...
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

helperjose:
Group Title
what is the prime factorization of 127
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

frx:
Group Title
\[z ^{3}+2(1−6i)z ^{2}+2(1−12i)z−24i=0\]
\[−ib ^{3}−2(1−6i)b ^{2}+2(1−12i)bi−24i=0\]
\[−ib ^{3}−2b ^{2}+12ib ^{2}+2bi+24b−24i=0\]
…
 updated one year ago
 2 replies
 1 Medal
Mathematics

frx:
Group Title
How many words with 11 letters can you make with the letters in the following word:
COMBINATION
…
 updated one year ago
 13 replies
 1 Medal
Mathematics

ksw19372:
Group Title
what is a cartesian equation?
 updated one year ago
 2 replies
 1 Medal
Mathematics

frx:
Group Title
7x+18y=208
18=7(2)+4
7=4(1)+3…
 updated one year ago
 9 replies
 2 Medals
Mathematics

frx:
Group Title
Show, using L'Hopitals rule, that
\[\lim_{x \rightarrow 0} x^{a}lnx = 0\]
for a>0…
 updated one year ago
 5 replies
 1 Medal
Mathematics

fruit59:
Group Title
2x + 3y = 2 and x + 2y =6
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

frx:
Group Title
i. Altair
ii. Procyon
iii. Epsilon Indi
…
 updated one year ago
 3 replies
 1 Medal
Mathematics

zigzagoon2000:
Group Title
What is the factored form of the expression?
12d^2 + 4d – 1
…
 updated one year ago
 5 replies
 1 Medal
Mathematics

mathgirl501:
Group Title
I need help figuring out how to work this problem... simplify the expression 0.4x^3+0.3x^30.2x^3...I just need to know how to slove it... I…
 updated one year ago
 5 replies
 No Medals Yet
Mathematics

zigzagoon2000:
Group Title
What is the degree of each monomial?
7m^6n^5
…
 updated one year ago
 3 replies
 1 Medal
Mathematics

rambo2210:
Group Title
What is 35% of a number if 12 is 15% of a number?
(A) 5
…
 updated one year ago
 8 replies
 No Medals Yet
Mathematics

mathgirl501:
Group Title
a barrel contains 164 gallons of water and is being drained at a constant rate of 9 gallons per day, write an equation that models the numbe…
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

zigzagoon2000:
Group Title
What is the factored form of the expression?
3x^2 + 8x – 16
…
 updated one year ago
 5 replies
 1 Medal
Mathematics
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