Mathematics - 12 October 2006

2006-10-12 23:17:50 · 8 answers · asked by Anonymous

A swimming pool can be filled by an inlet pipe in 8 hrs & emptied by an outlet pipe in 10 hrs. One day the pool is empty and the owner opens the inlet pipe to fill the pool. But she forgets to close the outlet with both pipes open. How long will it take to fill the pool?

I will vote for the best answer here....tnx.

2006-10-12 23:05:34 · 12 answers · asked by double B 2

The perimeter of a triangle rose garden is 42 yards. The 1st side is 5 yards less than the 2nd & the 3rd side is 2 yards than the first. What is the lenght of each side of the garden?

Thanks!

2006-10-12 22:48:14 · 11 answers · asked by double B 2

calculate the slope, x-intercept, and y-intercept, and label the intercepts

1. A semiconductor manufacturer seeks to maximize its profits. Testing indicates that they can produce 100,000 chips per week at a cost of $40 per chip, and sell them for $65 per chip. They also find that they can produce 125,000 chips per week at a cost of $35 per chip, and sell them for $63 per chip. How much profit can they expect to earn if they produce 130,000 chips per week?

2006-10-12 22:28:13 · 5 answers · asked by pmgstudios 1

Why we use complex representation for periodic wave?

Exp(-jwt)=cos(wt)-jsin(wt)

we just need the real part? The imaginary part is what for?

2006-10-12 21:50:52 · 3 answers · asked by LJ 2

2006-10-12 21:38:53 · 13 answers · asked by BearMan 1

2006-10-12 21:25:30 · 8 answers · asked by BearMan 1

calculate the slope, x-intercept, and y-intercept, and label the intercepts

1.Find an equation in slope-intercept form passing through the points (-6.2,18.1) and (-3.4,18.1).

2.Tom buys $20,000 worth of stock, and sells it eight months later for $28,000. If he is required to pay 15% capital gains tax on his profits, how much tax will he pay?

2006-10-12 20:58:51 · 6 answers · asked by pmgstudios 1

EXPLAIN THE EQUATION

1.
The sum of two numbers is 72. One of the numbers is six more than twice the other. What are the two numbers?

2.
A bricklayer and an electrician together spend 90 hours working on a new house. If the bricklayer earns $12 per hour, the electrician earns $16 an hour, and the owner pays them a total of $1350 for their work, how many hours does each worker spend on the house?

2006-10-12 20:45:29 · 10 answers · asked by pmgstudios 1

For the systems of linear equations in questions 1-3
-Determine how many solutions exist
-Use either elimination or substitution to find the solutions (if any)
-Labeling the x-intercepts, y-intercepts, and points of intersection

1. y = 2x + 3 and y = -x - 4

2. 2x + 3y = 8 and 3x + 2y = 7

3. x + y = 3 and y = x + 3

4. A university bookstore recently sold a wirebound graph-paper notebook for $2.50, and a college-ruled notebook for $2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $118.60. How many of each type were sold?

5. A shopper buys three oranges and five lemons for $10.26, while a second shopper buys four lemons and six oranges for $11.16. What is the price of each fruit?

6. In a triangle, the sum of the interior angles is 180 degrees. If angle A is three times as large as angle B, and angles B and C sum to 90 degrees, what is the measure of each angle?

2006-10-12 20:41:18 · 5 answers · asked by pmgstudios 1

solve.

-5√8x-4 +3 = 18

how do i find the answer to this one? what are the steps?
the 8x-4 are under the square root, not the +3.

2006-10-12 20:12:25 · 10 answers · asked by Sharon 1

Frequency distribution table (in $'000)
Lower LimitUpper LimitCountCumulative Count%Cumulative %
2030337.50 7.50
31406915.00 22.50
415081720.00 42.50
516072417.50 60.00
617073117.50 77.50
718053612.50 90.00
81901372.50 92.50
911003407.50 100.00

Can I know how to compute the variace and standard deviation from the above data? What is the formula? Thanks in advance.

2006-10-12 20:05:58 · 1 answers · asked by StarGirl 2

suppose limit a_n = A
prove that limit (a_n+1 - a_n) = 0

many thanks

2006-10-12 20:04:04 · 4 answers · asked by superfly 1

x_1 and y_1 are given, x_1>y_1>0

x_n+1 = (x_n+y_n)/2
y_n+1 = sqrt(x_n*y_n)

a)proof y_n< y_n+1
b)proof y_1 < x_n+1 < x_n

c)proof 0<(x_n+1) - (y_n+1)< (x_1 - y_1)2^n

d)explain why {x_n} and {y_n} are convergent and have the same limit


anything will help
Thank you all of u guys

2006-10-12 19:59:32 · 1 answers · asked by superfly 1

Factor completely

-3t^3 + r^2-6r

so whats the difference?
Factor each polynomial completely

2x ^2 – x – 10

10a^2 + ab –2b^2

2006-10-12 19:36:37 · 4 answers · asked by SCHNITZEL 1

Factor completely

-3t^3 + r^2-6r

2006-10-12 19:30:54 · 6 answers · asked by Anonymous

I can understand when I see the answers... but my teacher has a hard time explaining what he is trying to teach.... I am so confused!
If nobody can help... THATS COOL I UNDERSTAND:)

2006-10-12 19:27:39 · 4 answers · asked by pmgstudios 1

Here's the question:
assume x^2+3x+2=0
this factors to
(x+2)(x+1)=0

Now divide both sides by
(x+2)(X+1),
and you get

((x+2)(X+1))/((x+2)(X+1))=0/((x+2)(X+1))
For the left side, you get (x+2)(X+1) over itself, which is one, while for the right, since you are dividing 0, you get zero. This leaves you with:
1=0, which is obviously not right, where is the mistake in this problem?

2006-10-12 19:23:09 · 7 answers · asked by aglon314 2

Factor each polynomial

b^2 + 5b – 24

v^2 – 22v – 75

2006-10-12 19:18:21 · 6 answers · asked by Anonymous

Solve the following equation for the unknown: 7x - 3 = 18

Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph.

3. y = x + 3

4. y = -2x - 7

5. (5 points) 2x + 3y = 9

6. (5 points)
A consumer electronics company sells 6.7 million MP3 players per month at a price of $100 apiece; when the price is lowered to $80, the company sells 10.2 million players per month. How many MP3 players can the company expect to sell per month at a price of $75?

7. (3 points)
The points (1,5), (4,5), and (1,0) represent three corners of a rectangle; find the coordinates of the fourth point.

8. (5 points)
Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar?

9. (4 points)
Find an equation in slope-intercept form passing through the points (2,5) and (7,-3).

10. Sales tax in Pennsylvania is 6%. Create an equation for the total

2006-10-12 19:01:55 · 9 answers · asked by pmgstudios 1

Factor each polynomial completely
2a2 – 4a – 2

t2 – 9w2

Completely?

2006-10-12 18:58:58 · 4 answers · asked by Anonymous

The politicians who passed it like to say it's a 1% increase.
Is it?

2006-10-12 18:42:01 · 3 answers · asked by Anonymous

its about linear equation of algebra subject

2006-10-12 18:27:00 · 4 answers · asked by mayumi 1

2006-10-12 18:19:34 · 13 answers · asked by newyorktocountry 2

the guitar must be between 1/2 and 3/4 of the size of a full guitar
find and list in from least to greatest ,four fractions in that range express the fractions in lowest terms

2006-10-12 18:05:27 · 5 answers · asked by Jen 1

2006-10-12 17:51:52 · 11 answers · asked by s t 2

2006-10-12 17:49:42 · 5 answers · asked by sp1nkxter 4

2006-10-12 17:39:13 · 10 answers · asked by SEREN0 2

2006-10-12 17:21:34 · 7 answers · asked by John 1

5 to the power of -2+5 to the power of 0-5 to the power of 3-5 to the power of -1.

2006-10-12 17:21:02 · 4 answers · asked by Tank 1