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How Do I Find the Difference of Cubes of 27x^6 - y^9

I dont understand how to do the difference of cubes thing. And please dont direct me to another website such as purplemath, Ive tried reading it, yet dont understand. Please help!-(a-b) (a^2 + ab + b^

A and b are fixed real numbers. evaluate the limit as (t) approaches (a) ((sqrt(3t+1)-sqrt(3a+1))/(t-a))

Use the conjugate. lim(x→a) [√(3t+1) - √(3a+1)] / (t - a) = lim(x→a) [√(3t+1) - √(3a+1)] * [√(3t+1) + √(3a+1)] / {(t - a) [√(3t+1) + √(3a+1)]} = lim(x→a) [(3t+1) - (3a+1)] / {(t - a) [√(3t+1) + √(3a+

Does (x^3)^2 equals to x^5

To understand why (x^3)^2 is x^6, let x = 10. x^3 = 1000. (x^3)^2 = 1000^2 = 1,000,000 = 10^6 = x^6. See, the answer is not 10^5.-No (x^3)^2 equals to x^6 answer since (x^3)^2 = x ^ 3*2 = x^6-X^6 c

A thermometer is taken from a room where the temperature is 25°C to the outdoors, where the temperature is

A thermometer is taken from a room where the temperature is 25°C to the outdoors, where the temperature is -11° C. After one minute the thermometer reads 7°C. (a) What will the reading on the thermom

What is the limit as x-->1+ for 1/(1-x)

lim x--> 1+ (1 from the right side) 1/(1-x) 1/positive infinity = positive infinity?-1 - x approaches 0 but from the negative side if the x -> 1 +. (1 - 1.1), (1 - 1.01), (1 - 1.001)... these are al

2nd order differential equation homework help please!

x+4x=0, x(0)=1, x(0)=-2 please show me how to find the amplitude, phaseangle, and period! i got as far as utilizing the characteristic equation... x^2+4 =0 x = +/- 2i x(t) = Acos(2t)+Bisin(2t) then

Product of elements with finite order in a group need not have finite order...

Show by example that the product of elements with finite order in a group need not have finite order.What if the group is abelian? I think its something like g^k = g^s Then (g^k)(g^-k) = (g^s)(g^-k)

Geometry problem help!!!!!

picture of the figure: http://i54.tinypic.com/2mzw3s7.jpg The question says: line VW is the _____ of line AY What goes in the blank and how do you know? kasahamnida/ thank you in advance!-Perpendi

Factoring polynomials...

I need to factor these polynomials but I dont quite understand them. a^2+2ab+b^2-c^2 4-a^2-2ab-b^2 x^4-(4x-5)^2 It would be great if someone could show me the steps.-1. (a+b-c)(a+b+c) 2. -(a+b-2)

Another math problem... can someone help

Im working on a practice SAT and cant figure out this problem... On a square gameboard that is divided into n rows of n squares each, k of these squares lie on the boundary of the gameboard.Which of

Lim (x,y)->(0,0) (sinx)(e^y - 1)/xy

How would you start this problem? I dont know if you can switch into polar coordinates given a sinx function and e^y function-Its much simpler than that! lim((x,y)→(0,0)) (sin x)(e^y - 1) / (xy) = lim

Limit as x approaches negative infinity (sqrt(9x^6 - x))/(x^3+1) = ? The answer is -3 but I don't understand

Cant the answer be positive three?-So the way I did it, since you get an indeterminate form of +∞/-∞ when you solve directly is that I divided the numerator and denominator by the highest exponent pow

Calculus has me stumped

Can you help me understand how to work a problem like this? A ball hit at a 24^ angle from 3ft above ground level just clears a 9ft fence 400 ft away. About how fast was the ball moving and how long

Proof of limit point

Prove that a is a limit point of a set D ⊂ R^p iff there is a sequence of points in D (not equal to a) which converges to a.-This can be taken as the definition of a limit point. Ill have to assume th

How are decimals used in everyday life

I would just like to know at least 3 examples of how decimals are used in everyday life. Some help please?-dollars and cents $ 4.15length like 4.5 mm or time 4.8seconds-Yeah, you randomly need to know
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