Mathematics - 21 October 2007

in an expression or an equation they are seperated by addition and subtraction signs..____

is it parentheses?

2007-10-21 10:51:12 · 5 answers · asked by AKR 2

y''+cos(x)y'+3|x|y=0, y(2)=3, y'(2)=-1
Please explain.

2007-10-21 10:48:41 · 2 answers · asked by nemahknatut88 2

An equilateral arch is drawn about an equilateral triangle with side length 9, dtermine the area of the equilateral arch.

2007-10-21 10:47:36 · 1 answers · asked by aha51806 2

can you explain the steps!

2007-10-21 10:43:04 · 2 answers · asked by hey wuz up 1

a heptagon has interior angles of 130',140 and 165.estimate the magnitude of each unknown interior angle.given that they are equal.

a nonagon has interior angles of 147',178',146', and 193',.calculate the magnitude of each unknown interior angle.given that they are equal.

a decagon has interior angle of 100',115',120',125',and 130'.the remaining angles are equal.calculate the size of each unknown interior angle.

2007-10-21 10:30:54 · 1 answers · asked by risingstar 2

An elevator hangs from a cable that goes through a pulley of diameter 6.4 feet. If the elevator climbs 215 feet in 13.8 seconds, determine the angular velocity of the pulley in revolutions per minute.

2007-10-21 10:28:58 · 3 answers · asked by aha51806 2

Use separation of variables to obtain the solution to the following IVP.

y' = t * y * e^(-t),

y(0) = e^(-1)

y(t) = ?

2007-10-21 10:28:28 · 2 answers · asked by ohsnapps 2

help please i have to finish a table and i've tried but dont get it.
please help
click on the link below to see the table
http://i56.photobucket.com/albums/g191/amandaluvsfrank/table.jpg

2007-10-21 10:26:12 · 4 answers · asked by Anonymous

You have $60 and your sister has $135.you decide to save $5of your allowance each week,while your sister decides to spend her whole allowance plus $10 each week. How long will it be before you hav as much money as your sister?

What would be an equation for that?

2007-10-21 10:20:14 · 4 answers · asked by =] 1

the temeperature at which water boils. T degrees celcius is a linear functon of the altitude "a" meters,at which it is heated. T =ma+b. In Banff AB the altitude is 1383 m and the water boils at 95 degrees celcius. On Mt. Logan BC the altitude is 5951m and the water boils at 80 degrees celcius.

determine the valued of m and b and write T as a function of a

2007-10-21 10:10:58 · 6 answers · asked by Anonymous

polynomials f(x) of degree <= n. Define F: Pn --> R^n+1 by f -> (f(a1)....f(an+1))
b) Explicitly find F−1(e1), . . . , F−1(en+1) (where e1, . . . , en+1 are the standard basis
vectors in Rn+1) in the case n = 2 and aj = j for j = 1, 2, 3. [Hint: Where does
(x − a)(x − b) vanish?]
c) in general, deduce that f-1(e1)...f-1(en+1) form a basis of Pn. In the special case done in (b), express the polynomial x as a linear combination of these basis elements

2007-10-21 10:07:16 · 1 answers · asked by carlosboozer 2

2007-10-21 09:49:57 · 2 answers · asked by Anonymous

route of 2 in an irrational number. being by letting p(n) be the statment thet rout of 2 not equal n/b for any positive integer b.

2007-10-21 09:44:22 · 3 answers · asked by LULU 1

which amount of money can be formed using only two dollar bills and five-dollar bills?

2007-10-21 09:41:57 · 2 answers · asked by LULU 1

not looking for the awnser i just really need the equations plz!!

Renting a moped from jack's adventure shack costs $42.50 a day plus 16 cents per km. The same moped rented from patrick's paridise tours costs $24.25 a day plus 25 cents pr km. Shara wants to rent a moped for three days. for witchc driving distance is jacks price cheaper? For witch driving dictances is particks price chaeaper?

thanks

2007-10-21 09:40:41 · 5 answers · asked by Anonymous

5 divides n squared - n for any non-negative integer n.

2007-10-21 09:40:10 · 2 answers · asked by LULU 1

3+3.5+3.5 squared+...+3.5 to the power of n= 3(5-1) to the power of n+1/ 4, whenever n is a non-negative integer.

2007-10-21 09:38:30 · 1 answers · asked by LULU 1

you have been hired for a retail job and must choose between two salary structures. witch is the better plan?

plan a

a monthly salary of $325 plus 2% commition on your sales

plan b a monthly salary of $100 plus 5% commition on your sales

solve by graphing in an appropriate window.

2007-10-21 09:20:00 · 5 answers · asked by Anonymous

Prove the identity.

(1 / (secΘ - 1)) - (1 / (secΘ + 1)) = 2 cot²Θ

can anyone please help me prove this identity?

thank you

2007-10-21 09:18:25 · 4 answers · asked by xyz 1

2007-10-21 09:12:26 · 4 answers · asked by Anonymous

You have 2 lengths of fuse. Each will burn exactly one hour. But the fuses are not necessarily identical and do not burn at a constant rate. There are fast burning sections and slower burning sections. How do you measure exactly 30 minutes using only the fuses and one lighter?
And what about 45 minutes?

2007-10-21 09:09:07 · 4 answers · asked by Anonymous

Hi,

I've looking in the internet but I can't find a straight answer.

The problem is this:

Suppose we have a 3-side die (faces marked 0, 1, and 2).

Are there general formulas to answer questions such as:

a) "After throwing the die 100 times, get the probability of the sum being 120"?
b) "After throwing the die 100 times, get the probability of the sum being greater or equal to 120"?

Any help is appreciated.

2007-10-21 09:08:51 · 2 answers · asked by Talpis 5

cos^2 - 2 cosx - 1 = 0

I know the trick is to factor...but I cant seem to factor it properly.

Help, please?

2007-10-21 09:04:19 · 8 answers · asked by Anonymous

I reduced it to y= (cos3x)^2 and then worked through it and got that the derivative equals (-6)(cos3x)(sin3x) but im not sure if thats right.
PLEASE SHOW WORK, thanks

2007-10-21 09:00:04 · 3 answers · asked by sam h 1

2007-10-21 08:59:04 · 8 answers · asked by Anonymous

thank you for answering

2007-10-21 08:34:19 · 11 answers · asked by CECILIA G 1

factor

show me how 2 do dis prob. step by step..plz i wanna learn

1. 5x^3y^3-10x^2y^3+5xy^3


2. 27xyz^2 -12xy

2007-10-21 08:32:39 · 1 answers · asked by plz help 1

i know how to do this but i am going blank on this problem:
rewrite so the y is a function of x.

3x + 2y - 4 = 2(5-y)


-im just confused about the two ys(and if you could explain the steps that would be nice)
please and thankyous

2007-10-21 08:30:38 · 4 answers · asked by Twilight182 4

2007-10-21 08:27:26 · 4 answers · asked by Anonymous

How do you go about find the secant function value of 48 degrees and 20 minutes on a Ti-84 Plus?

2007-10-21 08:27:15 · 1 answers · asked by Chris 2