Mathematics - 29 July 2007

2007-07-29 17:52:46 · 4 answers · asked by lvr_fox 1

24 minutes less time, but had the been 4 miles per hour less, the trip would have taken 24 minutes longer. Find the distance and rate.

2007-07-29 17:47:26 · 3 answers · asked by CPUcate 6

A cylinder has a height of 10 and a surface area of 78pi. Find the radius and volume of this cylinder. (pi=3.14)

I totally forgot how to solve this. Does this require the quadraic formula?

2007-07-29 17:37:45 · 11 answers · asked by laralaii 2

An insurance company has written 81 policies of $50,000, 480 of $25,000, and 945 of $10,000 on people of age 20. If the probability that a person will die at age 20 is .001, how much can the company expect to pay during the year the policies were written?

Thanks!

2007-07-29 17:21:10 · 4 answers · asked by fubcka 1

y = 2x2 - 10x - 1

y = 4x2 + 12x + 9

y = x2 + x + 1

y = x2 -5x + 4

2007-07-29 17:14:52 · 2 answers · asked by Anonymous

I am reviewing for next year and wanted some help (This is NOT homework, because nobody is making me do it and I am not getting a grade for it, so do not feel wrong or like you are helping me cheat on anything because you are not.

Okay lets get too it.

#1
There is one in this problem and it asks what the area of the shaded region is.

The outer area (the shaded part) has the top (3x+2) and the right side (x+1) the inside(not-shaded) is (3x) the top and the side is (x).

What is the area of the shaded area.

A 3x+2
B 5x+2
C 3x^2+5x+2
D 6x^2+5x+2

I am sorry it is kinda confusing but please try and by the way I got B using foil and some subtracting.

The next one has me stumped, "Which expression represents the product of 3 consecutive even integers,the first of which is 2x.

F 6x+6
G 2x^3+6x^2+4x
H 8x^3+8x^2+8x
J 8x^3+24x^2+16x

Thank you

2007-07-29 17:07:35 · 5 answers · asked by fred 3

A horizontal trough with semicircular cross sections 5 feet in diameter contains oil with a weight density of 80 lb/ft^3. If the trough is 25 feet long and filled with oil to a depth of 3 feet, find the work required to pump all of the oil to the top of the tank?

2007-07-29 17:00:06 · 2 answers · asked by shortdude 2

jus ignore the (>). I had to use it to get the right format of the problem.
>750
-DEF
----------
>DEF

Each of the letters D,E,F, represents a different digit in the subtracion problem above. What is the fraction that equals the decimal 0.DEF ?
a) 1/5 b) 1/4 c) 3/8 d) 1/2 e) 3/4

A broken watch loses 2 minutes every 4 hours. How long, in days, will it take the watch to lose 1 hour?
a) 2.5 b) 5 c) 6 d) 7.5 e) 10

2007-07-29 16:57:45 · 5 answers · asked by Anonymous

1. Show that if 3 divides n2 evenly then 3 divides n evenly. [Hint: n can only be of the form 3a, 3a + 1 or 3a + 2]
2. The point P lies within the angle ABC and is equidistant from AB and BC. Prove that PB bisects the 3.In triangle ABC, P is a point on BC such that PB PC and PA bisects

2007-07-29 16:31:31 · 2 answers · asked by needhelp! 2

y = 2x2 - 10x - 1

y = 4x2 + 12x + 9

y = x2 + x + 1

y = x2 -5x + 4

2007-07-29 16:26:32 · 3 answers · asked by Anonymous

1. 16y2 - 8y + 1 = 0

2. c2 + 10c - 25 = 0

3. 5x2 + 8x + 16 = 0

4. a2 - 5a - 14 = 0

5. If a quadratic does not have a linear term (in other words it is a "pure quadratic"), then it will always have 2 real solutions.
true or false?

2007-07-29 16:19:43 · 3 answers · asked by Anonymous

2007-07-29 16:18:49 · 5 answers · asked by theblueyoshi 2

(3-5x)^3
______ ,then f(x)=-5(2x+1)

(x^2+x-1)^2

2007-07-29 16:16:35 · 2 answers · asked by Anonymous

F(x) = x-1/X+2
F'(x)=3/(x+2)^2
F''(x) = 6/(x+2)^3

I need to find the following, I have some answer, and I need to make sure they are right

Domain of f: All real numbers execpt for -2

Find X and Y intercepts: do you set each equation to zero?

I know how to find all asymoptots

Critical Points

I know how to find if F is increasing or decreasing

Concave up is second derivative test... correct?

Any Inflection Points?

Sketch the graph (which is easy with the following information)

I've been studying extremely hard for this exam, and really would appreciate any help!

Thanks in advance!

2007-07-29 16:01:44 · 2 answers · asked by Anonymous

I noticed that whole numbers squared increase by the odd numbers. Halves increase by even numbers. Has anyone seen this in books anywhere?
1^2=1
2^2=4 . . . 4-1=3
3^2=9 . . . 9-4=5
4^2=16. . . 16-9=7

3, 5, 7, 9, 11, 13, 15

This pattern continues forever.

Also 0.5 squared equals 0.25,
1.5 squared equals 2.25,
2.5 squared equals 6.25
3.5 squared equals 12.25
2.25-0.25=2
6.25-2.25=4
12.25-6.25=6

2, 4, 6, 8, this pattern also continues.

I apologize for any mistakes, but I'm too tired to proofread this.

2007-07-29 15:50:26 · 5 answers · asked by Anonymous

Any Math Gurus out there. I need to find the first and second derivative of x-1/x+2.

I found the first derivate which his 3/(x+2)squared the denominator is squared.

I am having trouble finding the second derivative and then the domains.

Any help would be appreciated

2007-07-29 15:47:39 · 2 answers · asked by Anonymous

(-3+i) + (4+6i) =


(-4 - 6i) + (-2 - 3i)


(4 + i) - (-3 + 2i)


(-2 + 5i) + (-4 - 2i)


(4 + 2i)(3 - i)


(-3 + i)(2 + 7i)


(5 + 2i)(5 - 2i)


4+2i over 3-i


3+i over 1-4i


-2-2i over 5-2i

2007-07-29 15:42:11 · 4 answers · asked by Anonymous

I've been trying to factor 6x^2 + x - 2. I've been trying to use the "what multiplies to -2 and adds to to equal x" method but I can't get it to work. I think it's -1 and 2. But when I foil it it doesn't work. maybe I'm completely missing something. If anyone has an easier way to do this then please answer!!

2007-07-29 15:17:11 · 7 answers · asked by mella 2

Debbie traveled by boat 5 miles upstream. Because of the 4-mph current, it took her 20 minutes longer to get there than to return. How fast will her boat go in still water?

2007-07-29 15:08:29 · 4 answers · asked by BJ G 1

2007-07-29 15:07:09 · 16 answers · asked by mohannad820002000 1

Simplify your answer as much as possible

5y-3/4 + 9y+6/2 =8

2007-07-29 14:28:48 · 14 answers · asked by Anonymous

2007-07-29 14:05:56 · 6 answers · asked by Anonymous

The perimeter of a rectangle is 120 inches. The length can be represented by (9x) inches and the width can be represented by (3x) inches. What is the length of the rectangle?

2007-07-29 13:51:27 · 4 answers · asked by Adrienne W 1

A fence needs to be placed around a pool that measures 12 feet by 18 feet. Around the entire pool is an 8 feet wide deck. How many feet of fencing will be needed?

2007-07-29 13:50:22 · 5 answers · asked by Adrienne W 1

2007-07-29 13:44:52 · 1 answers · asked by mathstudent 2

are the lines parallel? Yes or no

2007-07-29 13:27:21 · 4 answers · asked by bee 1

2007-07-29 13:16:48 · 3 answers · asked by Brije B 1

Given a polygon with 5 sides, determine the following:
part a) The sum of the measures of the interior angles.
part b) The sum of the measures of the exterior angles

and why

2007-07-29 13:12:34 · 4 answers · asked by zerokun4 1

If $1,500 is deposited each and every year in an account yielding 6% interest, compounded annually, how much money will have been saved after 10 years?

2007-07-29 12:57:51 · 3 answers · asked by Patricia F 1

solve algrbraically:

x3/2=27

2007-07-29 12:56:10 · 13 answers · asked by quepid622 1