Mathematics - 15 November 2007

Suppose f and g are both concave upward on (-infinity, infinity). Under what condition on f will the composite function
h(x)= f(g(x)) be concave upward?

2007-11-15 13:21:11 · 2 answers · asked by Anniepannie06 2

What is the limit of the series sum of (-1)^n * Pi^(2n+1) * 3^(2n+1) / [4^(2n+1) * (2n+1)! ] as n goes from 0 to infinity

2007-11-15 13:19:40 · 1 answers · asked by ! 2

Show that the curves y= e^(-x) and y= -e^(-x) touch the curve
y=e^(-x)*sinx at its inflection points.

2007-11-15 13:17:15 · 1 answers · asked by Anniepannie06 2

2007-11-15 13:16:20 · 17 answers · asked by Vedran Z 1

Having a little problem figuring out how to make percents out of these..

$2 to $3

4 ft to 5 ft

9 m to 12 m

15 lb to 18 lb

I'm having trouble calculating the percent increase and descrease of these..

2007-11-15 13:14:29 · 2 answers · asked by ... 3

Please help.

Write an equation of the circle described:

The points (8,0) and (0,6) are endpoints of the diameter.

2007-11-15 13:13:40 · 1 answers · asked by Anonymous

If not will you tell me what they
are.



PLLLEEAASSEEEE!!!!!!!!!!!!




Thanks.
=D

2007-11-15 13:05:42 · 4 answers · asked by barbeelicious!!!!!!!!!!!!!!!!!!! 1

Last year Mr{myteacher} took some of his best students to golf n stuff.
a round of minture golf was $9 per person
the transportation cost $180 for all students
If he spent only $450 on the whole trip how many students did he take??
and how did i get my answer

2007-11-15 13:05:27 · 9 answers · asked by alejandra jimenez 2

according to log properties, the graph of 2log(x-3) should equal log(x-3)^2. why arent they equal?

2007-11-15 12:59:20 · 3 answers · asked by Anonymous

please tell me in detail how i can construct a 22.5 degrees angle. thank you. this is for a take home test and it is due tommorow.

2007-11-15 12:42:13 · 3 answers · asked by Anonymous

one third of a number decreased by 2 is twice the number .find the number

2007-11-15 12:41:31 · 6 answers · asked by aisha a 1

The triangle has sides x-1, x, and 5. The perimeter is 12 units.

2007-11-15 12:39:32 · 4 answers · asked by Jenny 1

Am I right?

1) Is (x+2) a factor of 2x^3 + 7x^2 +5x - 2?

FOR THIS ONE I GOT: Yes
---------------------------------------------------
2) The height of a flare is described by f(x) = -16t^2 + 320t + 50 (t= seconds). How long will it take to flare to reach its highest point and what is the highest point?

FOR THIS ONE I GOT: For this one I got time is 10 and height is 150.
----------------------------------------------------
Matching: (a) f(x) = x^2 + 2
(b) f(x) = ½(x+2)^2– 2
(c) f(x) = -(x-2) + 2
(d) f(x) = 2(x+2)^2 + 2

3) only function with a maximum point

FOR THIS ONE I GOT: (c)

4) narrowest graph

FOR THIS ONE I GOT: (d)

2007-11-15 12:31:04 · 2 answers · asked by Anonymous

all of the following numerators have the denominator 4,600,000,000:

3,500,000,000

544,000,000

254,000,000

505,000,000

408,000,000

360,000,000

286,000,000

245,000,000

320,000,000

208,000,000

144,000,000

100,000

13



all of the answers need to have the denominator of 100

2007-11-15 12:29:33 · 3 answers · asked by Anonymous

f ''(x) = 8x + 6 sin(x)

f'(0)= 4
f(0)= 3

What is f(5)?

( I am having trouble with the sin5/cos5 part)

2007-11-15 12:20:50 · 2 answers · asked by Rachel 1

i have no problem to use as an example

2007-11-15 12:16:54 · 4 answers · asked by ALESANA 7

Need a random number please ^.^

2007-11-15 12:13:20 · 3 answers · asked by Anonymous

Sylvia has $11.25 in nickels, dimes, and quarters. She has 3 times as many nickels as dimes and 5 more quarters than dimes. How many of each kind of coin does she have?

The Answers are 20 Dimes, 60 nickels , 25 Quarters

the problem comes with the answers.

But can some1 explain to me very well how to step by step get the answer
i tried for 20 mins on 1 problem still don't get it!
THX

2007-11-15 12:11:30 · 8 answers · asked by KoF 2

they are equal to eachother i just have no idea how to even start this. i know all the trig identities but im just baffled

2007-11-15 12:03:10 · 2 answers · asked by Alina Z 2

1. Find the scalar equation of the line that passes through the point P(0) and has a normal vector n.

P(0)(4,-2), n = (2,7)

2. Find the Cartesian equation of:

(x,y) = (4, -6) + t (8,2)

3. Find the scalr equation of the line that passes through (2,-6) and is parallel to 2x - 3y +8 = 0.

4. Find vector and parametric equations of the line:

5x - 3y + 15 = 0

2007-11-15 12:01:38 · 2 answers · asked by Anonymous

How many distinct even five digit numbers greater than 60,000 exist if each of the digits 3,4,5,6 and 9 must be used exactly once in each even number?

2007-11-15 11:51:58 · 4 answers · asked by Quagmire77 1

please show work if possible

1. the numbers, 999, 777, and 111 contain a total of nine digits. cross out one or more of the digits and the sum of the numbers left need to equal eighteen. how would the answer to this puzzle change if the directions change to: cross out one or more of the digits and the sum of the digits left need to equal eighteen?

2. how many three-digit positive integers have three different even digits?

2007-11-15 11:50:57 · 2 answers · asked by Osamu Miyawaki 1

This is the problem:

http://img113.imageshack.us/img113/8365/665ae6.png

After doing everything, my result was:

x^2 - x - 6
And factored:
(x - 3)(x + 2)
x = 3, x = - 2

It says my answer is wrong, however. What was my mistake?

2007-11-15 11:46:49 · 1 answers · asked by Sebastian 2

2007-11-15 11:39:55 · 6 answers · asked by manimusiclover 1

2007-11-15 11:38:36 · 2 answers · asked by cutiepie1334 1

what ever number you have in the numerator, match the same amount of numbers in the denominator with 9's. such as: 22/99=.222222, or 34/99=.34343434, or 123/99=.123123123...etc.

2007-11-15 11:35:13 · 7 answers · asked by Anonymous

=O

2007-11-15 11:31:34 · 7 answers · asked by cindy g 1

Suppose c is a constant such that, for all x, f prime x is equal to c. Use Corollary 7 to prove that there is a constant such that f(x) = cx + d for all x. Let g(x) denote the function c x.

Corollary 7: If f prime x = g prime x for all x in an interval (a,b), then f - g is constant on (a,b); that is, f(x) = g(x) + c where c is constant.

2007-11-15 11:24:26 · 1 answers · asked by mlleliang 1

I'm having trouble with this:

http://img107.imageshack.us/img107/4207/664vq2.png

I know how to use synthetic, but how do I put it in its factored form? Any help will be appreciated.

2007-11-15 11:15:45 · 2 answers · asked by Sebastian 2

please help me. i'm in chemistry 2, and i don't know how to convert centimeters cubed into decimeters cubed. thanks so much!

2007-11-15 11:13:42 · 8 answers · asked by Jdub 3