Mathematics - 23 October 2007

The question is to solve for X by completing the square:

x^2 - 30 = 8x

Serious answers only, please and thank you.

2007-10-23 05:36:55 · 10 answers · asked by Anonymous

Simplify the expression below.
((5 x^(3) y^(8))^3) / (5 x^5)

Give your answer using only positive exponents where the coefficient is an integer.
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Simplify the following expression. Express your answer in decreasing order.

(4x+5y) (4x-4y)

2007-10-23 05:34:00 · 4 answers · asked by Brandon M 1

On a road trip, five friends drove at 50 miles per hour to California. On the way home, they took the same route but drove 75 miles per hour. How many miles did they drive on the way to California if the round trip took 10 hours?


don't give me the answer, just the steps.
thanks!

2007-10-23 05:31:07 · 9 answers · asked by Anonymous

Okay, my class is now doing arc lengths and the hardest part of it is taking the integral of a function in the square root. Any function inside the square root with a polynomial greater than 1 is something that cant be done. The only trick i found so far is trying to factor it.

Like one example is taking the integral of say.....

sqrt ((x^2+4x+4)

What i did was change the function and make it look like this....

sqrt ((x + 2)^2)

^^^^ that one is the same as sqrt ((x^2+4x+4)

So the square root and the square cancels out and I just take the integral of (x + 2) instead.

But now, what if you cant do that anymore? If you cant solve it like that anymore?

Is there a way to taking integrals of a function inside a square root? Like say the integral of the square root of (sinx e^x)

How do you do that?

2007-10-23 05:31:03 · 8 answers · asked by Anonymous

2007-10-23 05:24:33 · 4 answers · asked by Anonymous

Hello everyone, need some help with some math exercises.

1-) Which ordered pair is a solution to the system?
-2x+7y=31
5x-11y=-45
I answered (2,5)

2-) Solve the system using the graphing method.
x+y=8
3x+y=20
I answered No Solution

3-) Solve the system using the substitution method.
y=5x+7
-3y+15x=-8
I got (7,-8)

4-) Solve the equations using the most convenient method.
8x-4y=6
16x=8y+12
Got ( 8,4 )

5-) If z(t)=2t.square+7t-4, find z(-1) and z(2)
This one im stumped.

Thanks for the help.

2007-10-23 05:17:41 · 5 answers · asked by felipe1974 1

I have a spreadsheet with 3 columns. A contains an importance factor, a number from 1 to 5. B contains a percentage, the amount of the completed task. C contains the number of days it is taking to do/finish the task.

taskA 3|67%|30
taskB 1|98%|70

I want a total completed percentage for the project, where the project is made of those two tasks.

I can do it for 1 factor. For instance, with days as the weight:
=B1*C1/($C$1+$C$2)+B2*C2/($C$1+$C$2)
or 89% complete
But how do I factor the fact that taskB is less important (it's value is 1)? Thank you!

2007-10-23 05:10:30 · 1 answers · asked by jc 1

I don't know why but people say trigo is hard and annoying. why?

2007-10-23 05:07:32 · 5 answers · asked by mike 1

a. (6, 6)
b. (-6, -6)
c. (-6, 6)
d. (6, -6)

thanks!

2007-10-23 05:05:06 · 3 answers · asked by Anonymous

a. II
b. II
c. III
d. IV

thanks...

2007-10-23 05:02:20 · 11 answers · asked by Anonymous

φ(n) is normally divisible by 4. Describe all the n's for which φ(n) is not divisible by 4.

2007-10-23 05:01:59 · 2 answers · asked by 3545 2

How would you apply a factoring formula to completely factor the expression "x4 - 1"?

2007-10-23 05:00:09 · 7 answers · asked by Snoopy Baby 1

If the coefficients of a polynomial function are all positive, then the polynomial has no positive zeros.

2007-10-23 04:47:23 · 3 answers · asked by gigichic21 1

2007-10-23 04:35:22 · 10 answers · asked by maine161991getmoney 1

2007-10-23 04:32:34 · 9 answers · asked by maine161991getmoney 1

in a car race, car number three averages 140km/h and car number five averages 5 % greater than car number 3. if one lap of the track is 8 km, how many laps around the track will car number 3 go before being passed by car number 5?

2007-10-23 04:31:16 · 1 answers · asked by Kalluto~ 2

No nonsens to confuse me
just the answer please

2007-10-23 04:21:26 · 4 answers · asked by EmoClaire 3

The spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the rim of the wheel is 42 inches, how long is each spoke?

2007-10-23 04:09:31 · 10 answers · asked by Abigail 2

2007-10-23 04:07:18 · 5 answers · asked by trudemonhunter 1

The average income of these ten people is $10,000. Each person's income is the average o the income of the people sitting immediately to his or her left and right. What is the possible range of incomes for each person?

2007-10-23 03:59:37 · 7 answers · asked by chimpforaday 1

(Q2) Hence find the set of values that k can take?

x2 = x squared

2007-10-23 03:57:08 · 4 answers · asked by Jimmy_830 3

successions prefered

2007-10-23 03:54:34 · 2 answers · asked by boris l 1

2007-10-23 03:46:28 · 7 answers · asked by ilovedstny 1

Solve:

(a) 4^(x-1) = 8^(2x+3)

(b)4(x-1) = 7

(c) e^(2x-1) = 8

2007-10-23 03:42:23 · 3 answers · asked by pearlnruby89 1

its for MATH help quick thnx

2007-10-23 03:40:47 · 8 answers · asked by Anonymous

I'm working on a very difficult Calc. II project involving divergent and convergent integrals. I was wondering if anyone knew of a website that listed divergent or convergent integrals. Or, if you could help me out with this problem:

the integral of F(x) from 1 to infinity is divergent, the integral of G(x) from 1 to infinity is divergent, and the integral of F(x) - G(x) from 1 to infinity is convergent. I have to find two functions that will fit into this problem. I have tired numberous things and have come up with nothing. Thanks everyone.

2007-10-23 03:37:37 · 3 answers · asked by Lauren 2

2007-10-23 03:28:21 · 4 answers · asked by Benjamin R 1

Let X1, · · · ,Xn be a random sample from uniform distribution with density
f(x) =1/θ, 0 < x < θ, θ > 0
(a) Find the maximum likelihood estimator θ ˆ of θ .
(b) Compute the cumulative distribution function (c.d.f) of θˆ  .
(c) Use to construct the 95% equal-tail confidence interval for θ .

2007-10-23 03:01:38 · 1 answers · asked by lover711219 1

2007-10-23 02:59:49 · 4 answers · asked by Anonymous

What can one say about m when the value of φ(m) is a prime number? Also, what can one say about m when φ(m) is the square of a prime number?

2007-10-23 02:58:36 · 2 answers · asked by 3545 2