Mathematics - 14 August 2007

2007-08-14 07:19:43 · 15 answers · asked by Anonymous

I have read following points in a quant book but am not able to understand them. Can anyone help me solving my belowmentioned queries:
1. Median to hypotenuse in Right-angled ∆ is circumradius of ∆. How??
2. Area of ∆ = rXs = abc/4R where s = semi perimeter, R = circumradius & r = inradius...... Can anyone provide me proof of the same.
3. Whether in an isosceles triangle inradius = 1/3 of height??
4. In chapter of trignometry it is stated that Area of ∆ = 1/2 X Product of 2 sides X sine of included angle... As per me it is applicable only in case of Right angle in a Right Angled ∆ & to no other angle.

You all are heartly requested to help me in resolving my queries.
Rgds
Parag

2007-08-14 07:10:12 · 2 answers · asked by Cool Dude 3

I wanted to buy something but i didn't have money.
I borrowed from friend "A " $ 25 and from friend "B" $ 25
I went to the store and bought thing that cost $45
In the store my friend "C" ask me to lend her $3
Now i have $2 left
I give back to my friend "A" $1 and to my friend "B" $1
Now i need to give back $24 to "A" and $24 to "B"

But $24+$24= $48

And + $3 that friend "C" will give me back =

$48+$3= $51

Where $1 dollars come from???????!!!!!!!!!!!!!!!!!!!!!!!!

2007-08-14 06:44:41 · 7 answers · asked by vica 4

log 3 27 = 3 Please show work

2007-08-14 06:23:00 · 4 answers · asked by Jenn 1

2007-08-14 06:22:00 · 3 answers · asked by rachel 1

16 3/2 = 64 Please show work

2007-08-14 06:12:20 · 4 answers · asked by Jenn 1

if something is for 50 dollars and u get 15% off ..how much would it be?

2007-08-14 06:05:35 · 8 answers · asked by Anonymous

If f(x) = ln(x) - 1, 1 <= x <= 4, evaluate the Rienmann sum, taking sample points to be left endpoints. Answer should be correct to six decimal points.
oh and <= "means less than or equal to"...
10 points for the CORRECT answer!!
thank you!

2007-08-14 06:01:19 · 4 answers · asked by ohsnapps 2

I go to a private school and over the summer we have to do 300 math problems. Most of them were sort of easy, but there are a few I did but am unsure if I'm right.

8+4(3)²
______
2²


(5)(-3)(5)
_______
2²




3(-4²)
____
6 - 2.5

^^^_____= division line



A taxicab company charges each person a flat fee of $2.25 plus an additional $0.60 per quarter mile. (A)Write a formula to find the total cost for each fare. (B) Use the formula to find the cost for 1 person to travel 6 quarter miles.



THANKS.

2007-08-14 05:46:25 · 6 answers · asked by Lisa L 1

By transforming to polar form, evaluate the following integral:

Int(2,3)Int(0,sqr(4-x^2)) Sin(x^2+y^2 )dydx

2007-08-14 05:46:10 · 3 answers · asked by leigh w 1

Graph the solution set of each of the following inequalities.

x > 4
<--------------->

2007-08-14 05:26:58 · 4 answers · asked by too_b2000 1

5)Suppose that the function P = 13+45ln x represents the percentage of inbound e-mail in the U.S. that is considered spam, where x is the number of years after 2000.

Carry all calculations to six decimals on each intermediate step when necessary.

a)Use this model to approximate the percentage of spam in the year 2003.

b)Use this model to approximate the year that the percent of spam will reach 95% provided that law enforcement regarding spammers does not change.

2007-08-14 05:21:52 · 3 answers · asked by DEE H 1

2007-08-14 05:15:57 · 7 answers · asked by Anonymous

2007-08-14 05:04:37 · 4 answers · asked by mansur e 1

If a coin is tossed in the air 100 times, what is the probability that it will land tails up on the 40th toss?

2007-08-14 04:53:36 · 9 answers · asked by Celris 3

Expand the following:

Q1) (x + y)(x^2 - xy +y^2)
Q2) (x^2 - 4)(x^2 - 2x + 1)
Q3) (5 - 2a)(2 - 3a - a^2)
Q4) (1 - 2x)(3 + 2x - x^2)

Solve these questions correct with detailed workings and earn points!!! :)
The lucky person with the best answer will be voted as the "BEST ANSWER".
Voting of the best answer will take place after 12hours!!.

2007-08-14 04:38:56 · 8 answers · asked by Anonymous

Write the equation of the line perpendicular to the line x - 5y = -10 and passing through the point (2,5).

Write the equation of the line parallel to the line 4x + 2y = 5 and passing through the point (-3,5).

Write the equation of the line parallel to the line 10x - 5y = 8 and passing through the point (2,4).

Write the equation of the line perpendicular to the line x - 3y = 9 and passing through the point (3,5).

Write the equation of the line parallel to the line 4x + y = -1 and passing through the point (5,0).

A) y = -4x + 20
B) y = -3x + 14
C) y = 2x
D) y = -2x - 1
E) y = -5x + 15

2007-08-14 04:19:44 · 5 answers · asked by ? 5

2007-08-14 03:59:01 · 2 answers · asked by yaradua1908 1

2007-08-14 03:55:30 · 6 answers · asked by Garyz 1

Could anybody explain these types of problems to me?:

"A solution set of the equation 5 sin (X) + 3 = 3 contains all multiples of:"
(1) 45 degrees
(2) 90 degrees
(3) 135 degrees
(4) 180 degrees


How would I go about completing this and other problems concerning soultion sets.
Thanks in advance.

2007-08-14 03:51:54 · 11 answers · asked by Anonymous

Ben wants to bake a cake. His recipe calls for a solution of one teaspoon of baking soda dissolved in 100mL of water to be added to the rest of the mixture. Use the data given below to answer the question that follows.
Ben uses tap water having a temperature of 20º C.
The teaspoon contains 5mL.
2.2 g of baking soda is present in 1mL
Solubility of baking soda at different teperatures is given in the table below.

TEMPERATURE (ºC)▬BAKING SODA (g)
0ºC▬6.9g
10ºC▬8.2g
20ºC▬9.6g
30ºC▬11.1g
40ºC▬12.7g
50ºC▬14.5g
60ºC▬16.4g

Will Ben be able to make his cake under the given conditions? Give reason.

2007-08-14 03:44:14 · 2 answers · asked by that's me™ 1

(rest of question) assuming no friction what is the force that your engine exerted to drive up this slope?

2007-08-14 03:41:22 · 2 answers · asked by Anonymous

In a problem like sqroot(x^4), does one enter the square root of the exponent 4 in the answer?

2007-08-14 03:23:24 · 8 answers · asked by Anonymous

Multiply: (x - 1)(x + 1)(x - 3)(x + 3)

a) x4 - 10x2 + 9
b) x2 - 10x + 9
c) x4 - x2 + 3
d) 2x4 - 10x2 + 19

2007-08-14 03:16:51 · 10 answers · asked by song_fiend 2

s (sqrt)(1 − x^2) dx

were s is the integral sign

is the answer
(x-1/3x^3)* (1-x^2)^3/2 + c

if not y not?

2007-08-14 03:12:24 · 6 answers · asked by Anonymous

A long distance phone company has a monthly fee of $7.95 and charges a rate of $0.05 per minute. Another long distance company has a monthly fee of $9.95 and charges a rate of $0.03 per minute. At how many minutes would the two companies have equal charges?

a) 10 minutes
b) 50 minutes
c) 32 minutes
d) 100 minutes

2007-08-14 02:48:16 · 6 answers · asked by song_fiend 2

Just a few that I need help with.

1. 3i+4i
2. 2i-5i
3. sqroot(-16)-sqroot(-9)
4.sqroot(-25)*sqroot(-4)
5. (-7i)*-i
6. sqroot(-4/9)*sqroot(-64/25)

2007-08-14 02:40:18 · 3 answers · asked by Anonymous

my original question with is (a+b)-4b2^ is actually wrong. This is the right question so how do you do it?

2007-08-14 02:24:30 · 3 answers · asked by Chardy 2

2007-08-14 02:10:57 · 6 answers · asked by newbie4_z 1

how to generate palindromic numbers?how can we generate a palindrome frm a given numbr..is der any generalized method for generating palindromic numbers?..and also...is there palindromes in decimals and frctions?

2007-08-14 02:06:02 · 4 answers · asked by ka2 3