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1. ### What the difference between playo dvd +r and -r??

Hi, The DVD+R and DVD-R are competing ...the formats. However, because the DVD-R format has been in use since 1997, it has...

4 Answers · Consumer Electronics · 22/02/2007

2. ### Prove r divides b . . .?

r solves x^2 + ax + b = 0 => r*r + a*r = -b => (r+a)*r = -b Since r,a are integers, -b is an integer multiple of r, and so is b, hence r divides b.

3 Answers · Science & Mathematics · 03/02/2013

3. ### dvd = r and dvd-r?

Hello, The DVD+R and DVD-R are competing ...the formats. However, because the DVD-R format has been in use since 1997, it has...

2 Answers · Consumer Electronics · 12/02/2008

4. ### Solve for R?(Math)???????

Multiply by r: 1 - 1/2 r^2 = 3/5 r 1/2 r^2 + 3/5 r - 1 = 0 5 r^2 + 6r - 10 = 0 And solve using the quadratic equation.

3 Answers · Science & Mathematics · 05/08/2009

5. ### (r-2)/(r+2)-2r/(r+9)=6?

[(r-2)(r+9) -2r(r+2)] / [(r+2)(r+9)] = 6 (r^2 + 7r -18 -2r^2 - 4r) / [(r+2)(r+9)] = 6 (-r^2 + 3r - 18) / (r^2 + 11r + 18) = 6 -r^2 + 3r - 18 = 6(r^2 + 11r + 18) = 6r^2 + 66r + 108 7r...

1 Answers · Science & Mathematics · 06/05/2010

6. ### True or false: if f'(r) exists, then lim x ->r f(x) = f(r)?

assume r is any number. {r} as x becomes sufficiently close to that number, f(x) becomes arbitrarily close to f(r). for example: say r = 7 which means: f(r) = f(7) as x approaches...

1 Answers · Science & Mathematics · 14/10/2013

7. ### Make 'a' the subject of R= ?

R=(ab)/(a+b) R(a+b) = ab Ra + Rb = ab Rb = ab - Ra Rb = a(b-R) a = (Rb)/(b-R)

1 Answers · Education & Reference · 01/11/2008

8. ### Prove that R is commutative if and only if R' is commutative?

Let f: R -> R' be an isomorphism. If R is commutative, and a... of R', then a' = f(a) and b' = f(b) for some a,b in R. Then we have: a'b' = f(a)f(b) = f(ab) = f(ba) = f(b)f(a) = b'...

2 Answers · Science & Mathematics · 05/12/2012

9. ### help with an easy math problem making 'r' the subject?

r^2+r=A/(2ph)? If so, then r^2+r-A/(2ph)=0=> r=[-1+/-sqrt(1+2A/(ph)]/2 => r=[-1+sqrt(1+2A/(ph))]/2 or r=[-1-sqrt(1+2A/(ph))]/2

2 Answers · Science & Mathematics · 20/09/2013

10. ### What is the rectangular equation of r=sin3theta?

Use the facts that sin(θ) = y/r and r = √(x^2 + y^2). First, for r = 3sin(θ): r = 3sin(θ) r = 3(y/r... is a circle. In the subject line, I'll assume you mean r = sin(3θ) and not r = sin^3 (θ). You'll have to use a trig identity for...

1 Answers · Science & Mathematics · 19/05/2007