Mathematics - 24 October 2007

I forgot.

2007-10-24 23:21:40 · 14 answers · asked by Evoke 6

Find an expression in terms of n, for the nth term of the sequence 17, 14, 11, 8, 5, ...

The answer is 20 - 3n

I don't understand why there is a 20 and a 3 in the expression and why a minus sign is present..Could someone explain it to me so that I could resolve my doubts? Thanks!

2007-10-24 21:55:33 · 8 answers · asked by Anonymous

2007-10-24 21:54:44 · 9 answers · asked by jr1984 3

2007-10-24 21:50:24 · 1 answers · asked by dird 2

integrate (cos(x)+1)/x^5 from 10 to infinity
Can it be written as an elementary function?
If so, what is the elementry function?
My CAS can't figure it out.
I got the CAS for free...you get what you pay for.
Convergence is obvious but i am uncertain about it's indefinite integral.
I have the feeling as though it cannot be written as an elementary function.

Thanks

2007-10-24 19:58:56 · 4 answers · asked by philip32189 2

here is a question
http://docs.google.com/Doc?id=dc83hzcs_212fgq97g

i tried to solve but it does not match with the answers given :(

2007-10-24 19:54:01 · 3 answers · asked by calculus 1

1. Logb20 X
- B stands for base , so it reads Log with base 20 (x).
2.Y = ln (x^3+2x^2+4)
3.Y = ln[1+e^(x)/1-e^(x)]
4.Y = e^(x^(2+1)) * ln X (most difficult)

10 points for Best Helper

2007-10-24 19:42:01 · 2 answers · asked by Conservative Jesus 1

P is the product of the digits and S the sum of the digits in N.If the natural number N is of the form XYZ where X is the number of hundreds, Y the number of tens and Z the units in N then
P= (X)*(Y)*(Z) ; S = (X)+(Y)+(Z). How many values N can take if 6P+4S=4N

2007-10-24 19:41:22 · 1 answers · asked by Venkat R 6

The total cost (in dollars) of producing x coffee machines is

C(x)=2500+60x-0.4x^2

(A)Find the exact cost of producing the 21st machine.
Exact cost of 21st machine =

(B)Use marginal cost to approximate the cost of producing the 21st machine.
Approx. cost of 21st machine =

2007-10-24 19:16:04 · 3 answers · asked by RedSparkle 1

solve for a:
K = ma/F

2007-10-24 19:01:01 · 12 answers · asked by DoWHATiDO 3

2007-10-24 18:35:15 · 4 answers · asked by senorita_otono 2

I used this rule: d/dx a^x = a^x (ln a).

2007-10-24 18:33:46 · 1 answers · asked by Conservative Jesus 1

A student was assigned a long division homework which he was able to correctly work out. Unfortunately the dog ate his homework, and all that was left was what you see below. All the digits were smudged except for an '8'. Help the student to reconstruct his homework.

Each x stands for a digit (not necessarily unique). The dots are only to make the digits line up.

..................x x 8 x x
........___________
x x x | x x x x x x x x
.............x x x
..........._____
................x x x x
...................x x x
..............______
......................x x x x
......................x x x x
......................_______

2007-10-24 17:59:09 · 3 answers · asked by Dr D 7

How would I simplify...

y > 4/3x^2 - 12x + 29

to vertex form?

2007-10-24 17:48:08 · 2 answers · asked by Anonymous

if 6 oranges equals 3 apples and 6 apples equals 2 bananas how many bananas are there in one orange one apple and one banana. well one banana equals one banana

2007-10-24 17:38:25 · 8 answers · asked by Purple 2

2007-10-24 17:37:21 · 2 answers · asked by Conservative Jesus 1

the integral is.....

3dx / x^2+6x+10

the 3dx is over the rest of the equation, i know you have to complete the square on the bottom first, which will be (x+3)^2 + 1. I need to use the substitution method where you let something equal u, then find du. Please help! I have a test in about 8 hours and need to know this.

2007-10-24 17:35:32 · 3 answers · asked by WV_Guy 3

Suppose that we don't have the formula for g(x) but we know that g(3) = 3 and g'(x) is equal to the formula below for all x Sqrt(x^2+7) use linear approx. to find g(2.95) and g(3.05)

I have no idea how to start this..can someone clue me in please?

2007-10-24 17:35:21 · 2 answers · asked by m_carl 1

Describe the set of all possible integer solutions for the following system of congruences:

x ≡ 5 (mod 6)
x ≡ 1 (mod 7)

2007-10-24 17:31:45 · 3 answers · asked by 3545 2

The price-demand and cost functions for the production of microwaves are given as
P=205-x/40

and

C(x)=86000+100x,

where x is the number of microwaves that can be sold at a price of p dollars per unit and C(x) is the total cost (in dollars) of producing x units.


(A) Find the marginal cost as a function of x.
C'(x)=
(B) Find the revenue function in terms of x.
R(x)=
(C)Find the marginal revenue function in terms of x.
R'(x)=

Ok, so for the first one do I do the derivative...which will be just 100?

Not sure, I'm confused!

2007-10-24 17:27:34 · 1 answers · asked by RedSparkle 1

What is the third power of 364392 (ex. a x a x a=364392)

2007-10-24 17:26:33 · 12 answers · asked by Anonymous

3.14..........

2007-10-24 17:26:15 · 9 answers · asked by butt 1

du= (2) {(lnx) / (x)}
v= (3x^2) / (2)
the eqn is vdu..i dont get how it is this
3xlnx
what was cancelled?

2007-10-24 17:26:05 · 1 answers · asked by ruby 2

Find all values of n that solve the equation φ(n) = n/2 using the following formula:

φ(n) = n(1 - (1/p_1))(1 - (1/p_2)*...*(1-(1/p_r)) <- where p_1,p_2,...p_r are the distinct primes that divide n.

2007-10-24 17:24:57 · 1 answers · asked by 3545 2

Does anyone know where on the net I can find a number generator? Like something that will produce all the numbers between 1900 - 2000 type thing?

Like 1901, 1902 etc.

Any help's appreciated :)

2007-10-24 17:21:19 · 4 answers · asked by Anonymous

5/x is 5 over x

2007-10-24 17:19:15 · 5 answers · asked by Anonymous

cant figure out

2007-10-24 17:05:27 · 4 answers · asked by aka_oximoron 1

2007-10-24 16:53:44 · 3 answers · asked by khaja p 1

2007-10-24 16:51:28 · 8 answers · asked by Anonymous

A particle moves along the curve: y = sq.rt.(1 + x^3). As it reaches the point (2,3), the y-coordinate is increasing at a rate of 4 cm/s. How fast is the x-corrdinate of the point chaning at that instant?

Can someone show me how to figure this out?

2007-10-24 16:47:08 · 2 answers · asked by the Jam 2