Mathematics - 11 September 2007

2007-09-11 23:36:41 · 10 answers · asked by Anonymous

A room sized 3.32 m2 x 4.96 m2 = 16.47 m2 (£2.80 per m2) 16.47 x £2.80 = £46.11

How do I convert this sum in Sq feet.

2007-09-11 23:22:51 · 9 answers · asked by ra88ie 2

2007-09-11 23:11:53 · 9 answers · asked by elsie a 1

1. A 36-ft ladder rests against the edge of a roof. Four feet of the ladder's length extend beyond the edge of the roof, which is 28 ft above the ground level. Find the tangent and secant of the angle that the makes with the ground.

2. The angle of elevation from a point on the ground to the top of the pyramid is 35degrees 30 minutes. The angle of elevation from a point 135ft farther back to the top of the pyramid is 21 degrees. Find the height of the pyramid.

2007-09-11 22:59:33 · 4 answers · asked by Anonymous

I know that if f and g are functions which are continuous at the point x = a, then the sum of f + g is continuous at x = a. But if f & g are continuous for all real x, will the sum & division of both be continuous for all real x as well? I think no, but I don't know how to prove it >_<
1 more question. If f(x)=g(x), for x isn't equal to c and f(c) isn't equal to g(c), then f & g aren 't continuous...is this true?I think it's false, but i don't know what function should I use.

Help please!
Thank you very much!

2007-09-11 22:43:15 · 4 answers · asked by pucchihime 1

I'm trying to follow an example solution, but having trouble with how the author got from:
1/[1+0.3e^(-0.276t)]
to
= [e^(0.276t)]/ [(e^(0.276t)) + 0.3]
How could this have been done?

2007-09-11 22:16:15 · 2 answers · asked by RogerDodger 1

Delivery truck is required to make five stops on its morning route. Let X denote # of on-time deliveries for a given morning, let f denote probability mass function of X, and let F denote the cumulative distribution function of X. Historical data suggests that:

f_X (5) = 0.88, f_X (4) = 0.06, f_X (3) = 0.03, f_X (2) = 0.02, f_X (1) = 0.008, f_X (0) = 0.002

1. Construct cumulative distribution function of X.
2. Determine probability that truck makes at least 4 on-time deliveries.

Any help or advice on how to start solving this problem would be great. My professor is not great at explaining and most of the class is lost in this subject.

2007-09-11 21:59:39 · 2 answers · asked by Anonymous

P(A) = 0.25, P(B) = 0.30, P(C) = 0.48, P(D) = 0.35
P(A n B) = 0.05, P(B n c) = 0.10, P(A n c) = 0, P(B n D) = 0

*D is a special case of C

1. The probability that has B but not A?
2. The probability does not have B but has A?
3. Does having D depend on whether or not patient has A?
4. Does having D depend on whether or not patient has C?

2007-09-11 21:49:54 · 3 answers · asked by Anonymous

2007-09-11 21:44:45 · 4 answers · asked by platinumbutterfly713 1

A cardiac monitor is used to measure the heart rate of a patient after surgery. It compiles the number of heartbeats after T minutes. When the data in the table are graphed, the slope of the tangent line represents the heart rate in beats pero minute. The monitor estimates this value by calculating the slope of a secant line. Use the data to estimate the patient's heart rate after 42 minutes using the secant line between the points with the given values of T. (give answers correct to 1 decimal place)

T (min)- --36-----38-----40-----42------44
HBeats--2526--2665--2803--2936--3070

a) T = 36 and T = 42
________________

b) T = 38 and T = 42
________________

c) T = 40 and T = 42
________________

d) T = 42 and T = 44
________________

2007-09-11 21:33:56 · 1 answers · asked by Rrrr0001 1

3z +5 < -7/5z+4

solve the inequality for z. Simplify as much as possible.

2007-09-11 21:23:47 · 4 answers · asked by MTak 2

y(squared)-3y-12

solve for y?

2007-09-11 21:22:52 · 3 answers · asked by MTak 2

i dont understand factoring this

a^3-125

2007-09-11 21:08:33 · 8 answers · asked by rawrzor 1

2007-09-11 21:02:48 · 11 answers · asked by platinumbutterfly713 1

The base of a triangle is numerically 8 less than its area, and the height is numerically 12 less than its area. Find the area of the triangle.


Please enter your answer as a number without the units.

2007-09-11 21:01:55 · 3 answers · asked by arod_69 1

i accidentally said solve...can you please help me factor this equation step by step?? thank you.

2007-09-11 20:28:13 · 4 answers · asked by antonini 1

First person to answer both correctly gets the 10 points.

lim t->-2 (1/2+1/t)/(2+t)

and

lim x->0 (tan2x)/(5x)

2007-09-11 20:15:29 · 2 answers · asked by Anonymous

A surface consists of all points P such that the distance from P to the plane y=1 is twice the distance from P to the point (0,-1,0). Find an equation for this surface and identify it.

2007-09-11 18:58:04 · 2 answers · asked by Anonymous

The cost of an Aardvark personal computer is $40 less than twice the cost of an Afghan computer, while and armadillo computer costs $70 more than an Afghan..
If an order of two Afghans, one Aardvark, and three armadillos totals $ 6820, what is the cost of each type of computer?

Please show ur work.Thank you.

2007-09-11 17:54:20 · 6 answers · asked by Chaz 1

The density of a penny is 8.56 g/ml. If the density of copper is 8.96 g/ml, and the density of zinc is 7.14, what percent of the penny is copper? What percent is zinc?

2007-09-11 17:40:39 · 2 answers · asked by lirael1019 1

Vector m has a magnitude of 5 m directed east
Vector p has a magnitude of 4 m directed 35 degrees west of due north.
1)What are the magnitude and direction of vector m + vector n
2)What are the magnitude and direction of vector n - vector m

I don't get how to draw the diagram to set up my problem, what exactly is 35 degrees west of due north? is the angle still going to be 35? (its in the 2nd quadrant isn't it)?
Also how would I find the magnitude and direction...thanks

2007-09-11 17:36:45 · 4 answers · asked by superman 4

Can some one show me how to solve the equation, 4^x + 4^-x = 5/2, algebraically?
I also need help finding the inverse fuction of sqrt(3-x), which I think is x^2 - 3, with domain restrictions. Any help is appreciated. Thanks.

2007-09-11 17:35:57 · 2 answers · asked by Chomp 2

2007-09-11 17:29:44 · 12 answers · asked by texan3715 1

2007-09-11 17:27:39 · 6 answers · asked by ryannnnn 1

tasty treats finds that its profit from the sale of ice cream increeases by 5% per week during the 15-week summer season, Suppose the profit for the first week is $30. Determine the profit for the season.

2007-09-11 17:23:26 · 4 answers · asked by Anonymous

the measure of an angle is 10 less than 4 times the measure of its complement....find the measure of the angle

2007-09-11 17:22:22 · 6 answers · asked by JOGOO 2

2007-09-11 17:19:15 · 12 answers · asked by peterkarsai59 1

2007-09-11 17:18:42 · 3 answers · asked by peterkarsai59 1

Hey everybody...I'm still stuck on trig sub integrals.

I have integral sqrt (x^2-9)/ x^3 dx

and I've gotten down to

1/3 integral 1 - cos 2 theta .... but I'm stuck after that...
I know that theta is inverse sec (x/3). but I'm clueless of how to end this problem. If possible, please show me the steps of how you proceed through the problem.

Thank you.

2007-09-11 17:18:12 · 1 answers · asked by J.W. 2

One urn contains 7 white balls and 3 black balls, and a second urn contains 4 white balls and 2 black balls. A ball is selected from each urn, and is placed in a bag containing 5 white and 6 black balls. What is the probability of drawing of drawing a white ball from the bag?

2007-09-11 17:17:58 · 3 answers · asked by sky_blue 1