Mathematics - 2 December 2007

Write the equation of the line which has y-intercept
(0, -2) and is perpendicular to the line with equation y = –3x + 1.

2007-12-02 11:44:46 · 2 answers · asked by Anonymous

2007-12-02 11:34:36 · 2 answers · asked by Wendy G 1

2007-12-02 11:33:28 · 2 answers · asked by Anonymous

a. None of the tangent lines are vertical.
b. (0,0)
c. (0,1)
d. (1,0)

2007-12-02 11:32:09 · 3 answers · asked by terrycropper 1

Please show me how to work this problem:
Give area of region bounded by F(x)=X^2 - 3, x=-2x and vertical line x= 2.
I worked the problem and I got 11/9. This is how I did the problem
Integrate (-2x - x^2-3) (limit -3 to 1) + integrate (-2x-x^2-3) (limit 1 to 2).

Please explain me my mistake and please go step by step.

thanks.

2007-12-02 11:25:31 · 3 answers · asked by Avi 1

Colin invested $16,000, part at 7% and part at 5%. If the total interest at the end of the year is $920, how much did he invest at each rate?

2007-12-02 11:25:23 · 4 answers · asked by Superman 2

Suppose that at a soda bottling plant it is known that 20% of the bottles filled require some “rework” because of improper labeling. If the quality control manager takes a random sample of 25 filled bottles off the mass production process: Estimate the probability that at least 3 defective labels appear in the sample?

The proportion of defective labels in the sample can be approximated by normal distribution.

Please help me. I have no idea what to do on this problem...

2007-12-02 11:24:02 · 1 answers · asked by Jerse 3

It's pre-algebra. HELP!!
She didn't teach us this stuff!

1. At the kolbus building, 3 out of every 7 employees use public transportation. There are 9,800 employees at the building. how many use public transportation?

2. The ratio of box seats at the ball park to general admission seats is 2 to 7. There are 2,500 box seats. How many general-admission seats are there?

3.Jacob delivered 90 circulars in 30 minutes. At this rate, how long will it take him to deliver 135 circulars?

4.At the airport, 4 planes land every 8 minutes. At this rate, how many planes will land in one hour?



I don't know what to do :{

2007-12-02 11:17:14 · 12 answers · asked by zeldahett 3

I have a question on my math HW and i cant figure it out.

For the system of equations given, write the augmented matrix. Use matrix row operations to put the matrix into row echelon or triangular form. Then solve the system.

x+2y+7z=5
5x -3z=8
2x-y =0



Any help would be awesome

2007-12-02 11:16:01 · 1 answers · asked by D 3

Let f(x) = (x^2)/(x^2 + 3)

a) find f'(x), solve f'(x) = 0 and get y -coordinate also.
b) On what interval of x's is f'(x) < 0 ?
c) On what interval of x's is f'(x) > 0 ?
d) Of the points found in (a), which one is a max, which is a min.


I can do this very easily on the calculator but we are supposed to show work. Also, part a is very simple for me to do but I don't know how to "properly" show parts b and c.

thank you

2007-12-02 11:12:17 · 1 answers · asked by Paulllll C 3

y < 2x² - 4x - 3

I got the right answers for x-intercepts and the vertex...

where do you shade it? the inside or the outside of the parabola lines? how do you check it?

2007-12-02 11:07:12 · 1 answers · asked by Juan C 6

ok so a bank teller is counting his money and notices that he has an equal number of tens and twenties. he also has $147 in other bills. he has $1,167 in all. how many tens and twenties does he have?
please show ur work
THANK U!!!!!!!!!!!!!!!!! SO MUCH
- Cloe

2007-12-02 11:06:52 · 3 answers · asked by Cupid Cleo 2

Factor completely

6. 64 + a^3

7. 2x^4 + 16x

8. 32a^4 - 162b^4

2007-12-02 11:01:12 · 4 answers · asked by magicalskittlz 2

Here is the problem.
-2x(squared) +12x-16= 0

Sorry there wasnt a squared key but the -2x is squared.

2007-12-02 10:46:16 · 6 answers · asked by Heather<3 2

Find the most general antiderivative of:
3squarerootx - 8/x^9

I get confused about the squareroot..

2007-12-02 10:42:27 · 5 answers · asked by Anonymous

Solve the system using the substitution method.

2007-12-02 10:39:51 · 2 answers · asked by malibu0108 1

solve -4(-x+3)=16

2007-12-02 10:34:16 · 8 answers · asked by So H 1

{3y = x - 30
{2x + 6y = 0

a. (15, -5)
b. (-5, 15)
c. infinite number of solutions
d. no solution

2007-12-02 10:24:10 · 3 answers · asked by . 1

If you have a problem such as 2.56x10^4 x 4.08^2 would the numbers 2.56 and 4.08 be added or multiplied when trying to simplify it?

Then if you had an exponent that was 10^3 x 10^2 would that equal 10^5 or 10^6?

Another is 1.2 x 10^24 divided by 6.0 x 10^20 what would that equal and why?

2007-12-02 10:23:19 · 2 answers · asked by Bri 1

solve -7+x=x/2+18

2007-12-02 10:06:06 · 2 answers · asked by Anonymous

solve 4/5x=5

2007-12-02 10:05:39 · 24 answers · asked by Anonymous

solve 8x+2-2x=6x+4-12x+2

2007-12-02 10:05:09 · 2 answers · asked by Anonymous

2007-12-02 10:05:08 · 2 answers · asked by Anonymous

2007-12-02 10:04:16 · 5 answers · asked by Anonymous

Given f(x) = {-x, for x> and /or = 1
{x+k, for x< 1


a). find the value of k so that f(x) will be continuous at x=1
b). Using the value of k found in part A, is f(x) differentiable at x=1


AND!
What is the minimus initial velocity needed so that a ball thrown upwards from the ground reaches the top of a building 40 feet high?


AND!!
A cylindrical Terrarium hanging from the ceiling leaks sand at the rate of 5cm^3/minute. The sand falls to the floor, forming a conical pile. the radius and the height of the cone are in the ratio 3:2. How fast is the height of the pile increasing when the radius is 9cm??


OMG....im SO lost! i dont even know where to start on any of these problems..PLEASE help me!

2007-12-02 09:57:18 · 2 answers · asked by Anonymous

i have this math problem, that i cant seem to figure out, can someone please help me.? the question goes as follows:

Question. A factory is to be built on a lot that measures 80m by 60m. A lawn of uniform width and equal in area to the factory must surround the factory. What demensions must the factory have?

Answer. It should have a uniform width of 10m
Factory is 60m x 40m


How would i figure that out?..any help would be great thanks

2007-12-02 09:56:37 · 2 answers · asked by lovesports 1

I know this is very basic question, but some how I want to understand this mathematics trick.
Let’s say I have $20,000 income this year which is increase of 25% from last year. When I multiply - 20,000 * .25, I get 5,000 but 15,000 (20,000 – 5,000) is not correct answer. Rather 16,000 is correct answer!

How do we calculate reverse percentage?

2007-12-02 09:54:02 · 3 answers · asked by Shiva 1

I need some help with my calculus homework. I'm trying to figure out the series representation for f(x) = ln(x+4) about c = -2. I know that you have to first take the derivative (1/x+4) so as to make it a rational function but then I don't know how to manipulate it so as to make it geometric form. I also have to specify the domain.

2007-12-02 09:53:15 · 1 answers · asked by Anonymous

I am not sure how to set up or solve this problem!

2007-12-02 09:53:07 · 3 answers · asked by Lorraine 2

2007-12-02 09:53:03 · 1 answers · asked by Anonymous