Mathematics - 13 October 2007

For how many whole numbers between 0 and 1000 does the sum of the digits equal 9 ?

2007-10-13 07:21:41 · 2 answers · asked by the flyer 1

http://i20.tinypic.com/2eqc8j9.jpg
thats the question please write statements and reasons thanks

2007-10-13 07:14:42 · 2 answers · asked by MrJ 3

Suppose you have a set of cards numbered consecutively from 1 to 100. You try to put the cards in pairs so that the sum of the of the numbers on the cards in each pair is 94. How many pairs will you have?

2007-10-13 07:12:33 · 4 answers · asked by the flyer 1

need answer soon as possible assignment due on monday

2007-10-13 07:01:12 · 2 answers · asked by allan t 1

input :3 24 36 12 45 60


output :1 8 12 4 and what are the two next numbers

2007-10-13 06:47:56 · 6 answers · asked by naruto uzamaki 1

2007-10-13 06:45:16 · 4 answers · asked by Patrick Star 1

2007-10-13 06:26:28 · 2 answers · asked by jimmy6067 2

2007-10-13 05:59:04 · 8 answers · asked by Anonymous

venture capital- Henry inversted $12,000 in a new restaurant. When the restaurant was sold two years later, he received $27,000. find his average annual return by solving the equation 12,000(1+r)^2= 27,000

2007-10-13 05:35:33 · 5 answers · asked by mormar 1

Hi, please tell me what I'm doing wrong because I can't figure it out! I'm supposed to solve this trigonometric equation on [0, 2pi).

It is:

6cos²x + 5cosx + 1 = 0

I figured that I'd solve it with the quadratic, simple enough.

-5 +/- √(25 - (4)(6)(1)
------ --------- --------- --
12

=

-5 + 1
---------
12

and

-5-1
-------
12

Giving me -1/3 and -1/2. I then discarded the -1/3 (which I apparently shouldn't have), and got values of 7pi/6 and 11pi/6 for the -1/2.

What I'm thinking is that I should have used a calculator and done the arccos for both (-1/3) and (-1/2). Would that be the right thing to do?

Thanks so much for any help! I'll pick a best answer TODAY!!!!!

2007-10-13 05:29:12 · 5 answers · asked by Anonymous

Find an equation for the plane that contains the line with parametric equations x = −1+3t, y = 5+2t,
z = 2 − t and is parallel to the plane 2x − 4y + 2z = 9.

2007-10-13 05:21:47 · 3 answers · asked by Eric W 2

Help me I can not do word problems at all
winter wheat- while finding the amount of seed needed to plant his three square wheat fields, Hank observed that the side of one field was 1 kilometer longer than the side of the smallest field and that the side of the largest field was 3 kilometers longer than the side of the smallest field.. If the total area of the three fields is 38 square kilometers, then what is the area of each field

2007-10-13 05:10:55 · 4 answers · asked by mormar 1

2007-10-13 04:59:31 · 3 answers · asked by Anonymous

Show that the tangent to any point (a,a^3) on the curve y=x^3 meets the curve again at a point where the slope is four times the slope at (a,a^3)

2007-10-13 04:36:34 · 4 answers · asked by NEBA 1

The Sell-Rite Corporation sells men's ties.The ties are priced at $26 each and they have been selling an average of111 per week.A consultant has determined that for each dollar the company reduces the price of ties, an additional13 ties would be sold.1.Write an expression in terms of x for the following:a.he cost of ties afster its price is reduced by $x.b.the # of ties sold per week after the price id reduced by $x. c.he sales revenue per week after reducing the price by $x.2.What price reduction, to the nearest cent, will maximize the sales revenue on ties?3.At this price reduction, find the new selling price and the average number of ties Sell-Rite can expect to sell per week.4.Sell-Rite spends$11.50to purchase each tie. They will consider only price changes that result in net profit (they will not sell ties for less than it costs to make them).Under these conditions,find the domain and range of the revenue function.How would this change if Sell-Rite could produce the ties for $9.75

2007-10-13 04:33:30 · 2 answers · asked by Thanh Thao 1

I want to know if this symbol * is used in the unit of measure of pound?
Thank You

2007-10-13 04:18:42 · 8 answers · asked by joy752002 1

h = –16t^2 + 90t + 10

How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

2007-10-13 04:16:41 · 3 answers · asked by Joe T 1

what is the reciprocal for

(81/16)^-3/4

2007-10-13 04:04:29 · 4 answers · asked by Cool_Q 4

What is 40,000 of 60 million? Percentage please

2007-10-13 03:54:31 · 21 answers · asked by rachel c 2

It means powers doesn't it? As in 2 to the power of four. Like 2^4, yea?

The answer's 16 of course. but is that what it is? is it powers? Yea?

2007-10-13 03:51:40 · 5 answers · asked by Anonymous

I know it might be easy but I sometimes have trouble in math and I needed a more creative way to get my answer other than a calculator!

2007-10-13 03:11:50 · 13 answers · asked by Angelica P 1

x + y = 20
30x + 25y = 550

2007-10-13 03:04:39 · 6 answers · asked by geomon2gyromon 1

I found this exercise (see below) in one of my basic chemistry books at the end of the first chapter. It sounds correct to me.

"Twenty years ago an ancient artifact was determined to be 1900 years old. Today it is determined to be 1920 years old."

Where am I going wrong?! Twenty years ago it would have been 1987 so the artifact must date back to the year 87 a.D.
(I subtracted the 20 years from today's date, and I subtracted 1900 from 1987). So, then you add 87 a.D. to 1920 and you get back the current year. This is why it sound correct to me!

2007-10-13 02:31:46 · 5 answers · asked by sharon 3

2007-10-13 01:42:14 · 8 answers · asked by olivia s 1

a) The length of a rectangle is 5m shorter than three times the width. If the perimeter is 54m, what are the dimensions of the rectangle?

b) Helen goes by bus or part of the way to school and runs the rest. If the time spent on running is 3 minutes longer than that on taking the bus and the total time spent is 15 minutes, how long does she spend on taking the bus?

c) $3000 is divided between two sons so that the elder son receives $200 more than two thirds the share of the younger son. How much does each receive?

d) May has 80 coins which of 10 cents coins, 20 cent coins and $1 coins. Among the coins, there are 4 more $1 coins than 10 cent coins and 6 more 20 cents coins than $1 coins. How much money does she have?

Please show working in equations and explain thanks.

2007-10-13 00:52:11 · 4 answers · asked by Hello 2