Mathematics - 28 October 2007

2007-10-28 06:53:00 · 8 answers · asked by DEBBIE C 2

I need to set up quadratic equations for these three word problems.. (that are solveable by finding the x-intercepts).

please help.. I have a test tomorrow.
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1) The director of a local preschool plans to enclose a rectangular area for a playground. One side will be the side of the building. If 60 ft. of fencing are to be used, what is the maximum area that can be enclosed?

2) What are the dimensions or a rectangle having the greatest area with a perimeter of 20 feet?

(as you can tell, those first two are pretty similar, so if you can do just one, I can probably figure out the other one.)

and 3) What is the largest value that can be obtained by multiplying two real numbers whose sum is three? Round your answer to the nearest hundredth.

Thanks in advance..

2007-10-28 06:51:47 · 5 answers · asked by lady. 2

I'm having some trouble setting up the vectors needed to solve for the area of a parallelogram

The vertices are K(1,2,3) L(1,3,6) M(3,8,6) N(3,7,3)

I should be able to reduce these down to a 2x2 matrix, correct?
If so, which vectors do I need to use? Would it be something like vector LM and vector KN?

Thanks

2007-10-28 06:41:31 · 3 answers · asked by Defcon6 2

There are 20 pencils in a box, a mixture of green, red and blue.

If there are 9 red and 5 blue how many green ones are there?

Are there any mathematicians out there who can give me the answer and how you arrived at it?

I've been working on this for several hours and it's giving me a headache.

Many thanks :-)

2007-10-28 06:41:31 · 30 answers · asked by Ms Minger 3

f(x)=x-2x^2

and also when f(x)=1/3x

2007-10-28 06:40:07 · 1 answers · asked by lovebird 3

2007-10-28 06:26:55 · 8 answers · asked by Josh j 1

This is a Trick Question and I know the answer.

2007-10-28 06:23:11 · 8 answers · asked by Anonymous

http://i24.tinypic.com/dbl16b.jpg

I really need help to figure out how to do the two questions above and Id really like to know how to solve them and not just get the answer so can someone please help explain them to me?

2007-10-28 06:18:47 · 1 answers · asked by ... 1

2007-10-28 06:05:23 · 1 answers · asked by Anonymous

here is a problem with solution.
http://docs.google.com/Doc?id=dc83hzcs_262dbzhxw

i have some doubts in the solution.

can you please clarify ?

2007-10-28 06:03:48 · 2 answers · asked by calculus 1

of.....
P(x)= (2x - 3)^7 (x+4)^8.

For each intercept determine whether the graph crosses the x-axis or intersects the x-axis without crossing it.

2007-10-28 05:39:00 · 3 answers · asked by K Rose 3

final answer should be y=12x-13

2007-10-28 05:37:27 · 3 answers · asked by lovebird 3

a rock is thrown vertically from the ground with a velocity of 24 meters per second, and it reaches a height of 2+24t-4.9t^2 after t seconds. How many seconds after the rock is thrown will it reach max. height and what is the max. height of the rock in meters? how many seconds after it is thrown will it hit the ground?

2007-10-28 05:37:21 · 3 answers · asked by ~USA~ 2

the equation w=120I-12I^2 represents the power(W) in watts, of a 120 volt circuit having a resistance of 12 ohms. when a current (I) is flowing through the circuit what is the max. power in watts that can delivered in this circuit

2007-10-28 05:22:16 · 3 answers · asked by ~USA~ 2

How much energy is lost if one person passes a subject in one year but he do not earn his livlihood from the knowledge what he has gained from that subject?

2007-10-28 05:17:13 · 4 answers · asked by GORAWALIA SHAH 1

what log base 8 of 0.001953125?
because i need help please find it

2007-10-28 04:50:46 · 6 answers · asked by star baller 360 5

c) sin[cos^-1(-(sq root 3)/2)]


d) cos^-1[cos(2pi/3)]


e) cos[sin^-1(1/2)]

2007-10-28 04:49:03 · 2 answers · asked by Anonymous

Perform the indicated operation:

a + 3/a^2 – 9 ÷ 4a + 12/5a – 15

Write the answer in lowest terms.

Thanks!

2007-10-28 04:46:32 · 1 answers · asked by Pete 1

Perform the indicated operation:

2/x-1 + 3/2x-2

Write the answer in lowest terms.

Thanks!

2007-10-28 04:41:27 · 9 answers · asked by Pete 1

Is the following trinomial a perfect square? x^2 + 18x + 81

2007-10-28 04:31:49 · 9 answers · asked by Anonymous

1) Prove that sinx +cosx=sin2x+cos2x
2) How many odd numbers less than 1000 can be formed by using the digits 0, 3, 5, 7 ,if the repetition of the digits are not allowed?

2007-10-28 04:30:03 · 5 answers · asked by Muralidharan kg 1

I dont know how to do this, please show work

Find all answers
sin(2theta)+3cos(theta)=0

2007-10-28 04:23:59 · 4 answers · asked by ted 1

The Local lottery has 39 numbers and if you match all 5 which they select you win the jackpot. The odds of winning the jackpot are 1 in 575,757, can someone show me how these odds are figured?

2007-10-28 04:11:06 · 4 answers · asked by Anonymous

PLEASE HELP ME WITH MY MATH I'M STUCK !!!



Explain in sentences what you must do in order to find the answer of a power with a negative exponent. Use 4^-3 and (2/3)^-5 to explain what you must do and show the extended multiplications. Give the final answer for each

2007-10-28 04:04:32 · 7 answers · asked by Tionna's mama 1

take out the largetst common factor

1) 10584h(superscript3)k - 1680hk(superscript4)

thanks

2007-10-28 04:01:51 · 2 answers · asked by marc e 1

how do i find the mode numbers:10,8,12,5,10,12,10,18

2007-10-28 03:59:36 · 9 answers · asked by donnelly2008 2

math open responce question

2007-10-28 03:52:12 · 18 answers · asked by kayycakess 3

B4A9 = 22921

What is the solution?

Please use the 7-3-2-1 code.

2007-10-28 03:45:48 · 6 answers · asked by MATHy lass 2

I don't get this math pre-algebra crap can someone help me?
Okay so i used to get this and then we had this horrible sub that got me all confused i dont no wat im doing anymore lol i get things fast but i have to get it 100% any ways the questions are to simplify these expression

1. 2g + 3(g + 5)

2. -3z + 8(z + y)

3. 4m + 3d - 5m + d

4. t - 3 + 2(t + 2)

5. 8z + 8y + 3z

6. t - 3t + 2t + 4

7. 18 + 6(9k - 13)

8. r + 3 - 6r + r

9. -4(a + 3) - a

10. 4m + 3 - 5m + m

11. 3(g + 5) + 2g

12. 2b - 6 + 3b - b

13. -5 + 3x + 3 + 2

14. 4(w + 2x) + 9(-4w)

15. 3(2n +4) - 2(3n + 6)

16. 4a - 3 + 5a

17. 2r - 5 + 6r

2007-10-28 03:42:22 · 5 answers · asked by naaman a 1

Okay so i used to get this and then we had this horrible sub that got me all confused i dont no wat im doing anymore lol i get things fast but i have to get it 100% any ways the questions are to simplify these expression

1. 2g + 3(g + 5)

2. -3z + 8(z + y)

3. 4m + 3d - 5m + d

4. t - 3 + 2(t + 2)

5. 8z + 8y + 3z

6. t - 3t + 2t + 4

7. 18 + 6(9k - 13)

8. r + 3 - 6r + r

9. -4(a + 3) - a

10. 4m + 3 - 5m + m

11. 3(g + 5) + 2g

12. 2b - 6 + 3b - b

13. -5 + 3x + 3 + 2

14. 4(w + 2x) + 9(-4w)

15. 3(2n +4) - 2(3n + 6)

16. 4a - 3 + 5a

17. 2r - 5 + 6r

Well i know how to do some of them but others im just lost with the signs and stuff thx every1

2007-10-28 03:32:44 · 9 answers · asked by naaman a 1