Mathematics - 30 October 2007

but the answer in the book is 4x^3+ 3x^2-1

I have no clue how to get to the right anwer..please help

2007-10-30 12:59:42 · 5 answers · asked by maybe71400 1

A. Find the position when the acceleration is equal to -28.
B. Find the acceleration when t=3

2007-10-30 12:48:51 · 4 answers · asked by Anonymous

2007-10-30 12:46:01 · 9 answers · asked by Jimmy Graber 1

2007-10-30 12:44:44 · 9 answers · asked by Latasha R 1

2007-10-30 12:43:18 · 36 answers · asked by Jim 2

A spotlight on the ground is 100 feet from a building that has vertical sides.(length is apparently infinity) A person 6 feet tall starts at the spotlight and walks directly toward the building at a rate of 5 feet per second.

How fast is the top of the person's shadow moving down the side of the building when the person is 50 feet away from the building?

Step by step instructions would be GREAT. Thanks in advance!

2007-10-30 12:42:55 · 1 answers · asked by Anonymous

2007-10-30 12:35:22 · 3 answers · asked by David 1

2007-10-30 12:33:04 · 5 answers · asked by sasha 4

Is it like ^5 radical x?

2007-10-30 12:29:21 · 3 answers · asked by Anonymous

I think have these answers right, but I was wondering if someone could help me make sure...

A is a 3x3 matrix. The null space of A = {The Zero Vector}
Select any of the following that is necessarily TRUE.
There may be more than one right answer.

a. the dimension of the null space = 1
b. the range of A = R^3
c. the columns of A are a basis for R^3
d. A defines a one to one mapping

I'm pretty sure D is true because when the null space is only equal the zero vector the function is one to one, and A must be true because there is only one vector in the null set. I'm pretty sure B and C are not necessarily true, but I'm not positive.

--

T is a linear mapping from R^3 into R^3.
The range of T is a plane through the origin.
Which of the following describes the null space of T?

a. R^3
b. a plane
c. a line
d. a point

I think it's B because I remember reading that the range is parallel to the domain's null set, but, again, i'm not sure.

2007-10-30 12:24:20 · 2 answers · asked by ? 3

A student makes and sells necklaces at the beach during the summer months. The material for each necklace costs him $6 and he sells an average of 20 per day at $10 each. He’s been wondering whether he should raise the price, so he conducts a survey and finds that for every dollar increase he loses two sales a day. What price should he set for the necklaces to maximize his profit?

please show all work..

2007-10-30 12:18:36 · 6 answers · asked by Anonymous

Use the percent proportion to solve each problem.

1) 18 is what percent of 45?
2) What percent of 60 is 39?
3)23 is 92% of what number?
4)What is 74% of 110?
5)What is 80% of 62.5?
6)36 is 15% of what number?

2007-10-30 12:18:02 · 6 answers · asked by haaaaahaaaa! 1

There were 360 pumpkins in a pumpkin patch, but it was difficult for Farmer Joe to Find the perfect pumpkin.


Every 3rd pumpkin was too small
Every 4th pumpkin was too green
Every 5th pumpkin had a broken steam
Every 6th pumpkin had the wrong shape.

How many perfect pumpkins did Farmer Joe find in the pumpkin patch?

Can you please show a complete explanation of your work.


Than You Really Appreciate It?

2007-10-30 12:17:11 · 4 answers · asked by Anonymous

Could anyone explain this to me? Thanks!

2007-10-30 12:15:20 · 4 answers · asked by Anonymous

Express each decimal or fraction as a percent. Round to the nearest tenth percent, if necessary.

1) 0.24

2) 0.03

3) 0.452

4) 1.9

5) 2/5

6) 13/22

7) 6/80

8) 77/225

2007-10-30 12:15:15 · 4 answers · asked by haaaaahaaaa! 1

http://college.hmco.com/mathematics/larson/algebra_trig/7e/assets/students/cp/03.pdf

How do you get from the original eqation of:

X^2+Y^2-3X+5Y-11=0 all the way to the solution (which they give as the top and botom half of the circle)??? Please help, THANK YOU

2007-10-30 12:08:16 · 1 answers · asked by Anonymous

2007-10-30 12:00:46 · 4 answers · asked by katelynjohofstetter 1

How do I show the expected value, of e^x?

Calculate E[e^(x) | X+Y]

Given gx(x) = gy(x) = e^((-x^2)/2) / (sqrt(2pi))
It is also known that X & Y are standard normal variables.

Thank you!

2007-10-30 12:00:08 · 1 answers · asked by Christopher M 2

at austin shoe factory 5 pairs of shoes, on average, can be placed in shoe boxes every 3 minutes. at this rate, how many pairs of shoes can be placed in shoe boxes during 8 hours of work?

2007-10-30 11:58:25 · 4 answers · asked by FRANCISCO M 2

measurements of floor---76 ft. at bottom--40 ft. left side--38ft. top go down 12 ft. right side is 20 ft. cost tile is 1.19 how many tiles and what will be the cost.

2007-10-30 11:56:52 · 3 answers · asked by latesleeper17 1

A Receptacle is in the shape of an inverted square pyramid 10cm in height and with a 6cm x 6cm square base. The volume of such pyramid is given by 1/3(area of the base)(height).
Suppose that the receptacle is being filled with water at the rate of .2 cubic centimeters per second. How fast is the water rising when it is 2cm deep?

Any help at all is greatly appreciated!!

2007-10-30 11:49:44 · 1 answers · asked by nicholas_obrien 1

the questions are
1) Which number has all the following characteristics?
Its is prime
it is greater than 90
it is less than 100
it is not a multiple of 3

2) find x if x is prime and 23
3)The area of a rectangle is 36. What could be the dimensions of the rectangle if the lenght and width are whole numbers and neither is a prime number?

4)Find the common multiples of 8 and 20 that are less than 300

5)There is a prime number between 11 and 46 about which a teacher will answer three "yes" and "no" questions from her class. After answering the question, the first student to determine the correct number will get extra credit.
The students asked: 1. is it 5 or 6 more than a perfect square?
2) it is three more than a multiple of 7?
3)is the sum of its digits odd?
The answer were yes, yes, and no, respedtively. What is the number?

2007-10-30 11:49:27 · 8 answers · asked by babygirl 1

2007-10-30 11:48:50 · 3 answers · asked by Alexander 6

know the question may seem a little complicated when first read, but I'll explain further. The objective is to write a function based on given information.

For f(x) for example...

If I'm given the type of equation (quadratic, cubic, quartic, etc), the leading coefficient, the constant, and the results of the evaluation of the expression for two x values (for example f(1)=a number, f(2)=another number)

And told to write a function that conforms to those requirements...how would I do this?

I think it involves systems of equations...but I'm not sure about that.

---

For further clarification, here's an example of what I mean.

f is a quadratic function
Leading Coefficient = 20
Constant = 20
f(1) = 20
f(2) = 200

Write an equation that conforms

---

Keep in mind that that scenario is a strict example; you don't need to solve it (it probably wouldn't work anyway haha). I just want to know how I would go about approaching a problem like this.

Sorry for the lengthy question heh

2007-10-30 11:45:21 · 2 answers · asked by Ryan 2

THIS IS THE QUADRATIC FORMULA:
http://media.nasaexplores.com/lessons/01-003/images/quadform.gif

and this is formula for the sum of the roots: (-b/a) and the formula for the product of the roots is: (c/a)

How do I derive thee formulas for sum and product from the quadratic formula?

THANKS!

2007-10-30 11:39:50 · 3 answers · asked by Anonymous

the total amount of interest on a loan of $6,000 for 150 days is $210.50. Round the answer to the nearest hundredth.
a)2.34%
b)8.42%
c)8.53%
d)11.88%

2007-10-30 11:38:53 · 1 answers · asked by Kary M 1

use the digits from 0 to 9 twice to fill in the 20 spaces in this multiplication problem.

_ _ _
x _ _ _
__________
_ _ _
_ _ _
_ _ _
__________
_ _ _ _ _

2007-10-30 11:36:41 · 2 answers · asked by Anonymous

A. 3, -4
B. -15, 3
C. 3, -5/3
D. -5/3, -4
E. -5, -3

2007-10-30 11:34:36 · 4 answers · asked by Anonymous

2007-10-30 11:33:36 · 9 answers · asked by Darryl Turner 1

1.) 6x^2 - 13x - 5

(3x + 1)(2x - 5)

2.) 2x^2 + 15x + 7

(2x + 14)(2x - 1)

Can someone help me understand why these are diferent? why on the second one must i add the two "product" and "sum" to equal the middle

while the other one (1) only equals to "-5"

thanks

2007-10-30 11:26:26 · 1 answers · asked by Anonymous