Mathematics - 26 August 2007

2007-08-26 23:47:06 · 6 answers · asked by Anonymous

If possible please show necessary working, thankyou much so!

2007-08-26 23:36:40 · 9 answers · asked by ♥Xenia♥ 5

it is about math

2007-08-26 23:27:09 · 15 answers · asked by urim m 1

Two cyclists started to ride at 8am: one from A to B, the other from B to A. Each of them rode at a constant speed along the same road and when each arrived at the terminal point, immediately turned back. They met for the first time at 11 am and each of them turned exactly once before they met for the second time. Find the time of their second meeting.

Thanks, a best answer will be voted for!!

2007-08-26 22:24:24 · 4 answers · asked by Ginga-Ninja 1

and the upper and lower limits are θ = pi/3, -pi/3. I try to solve as follows..:

1/2∫ (4 + 4cosθ)^2 - (6)^2 dθ

1/2∫ (16 + 32cosθ + 16cos^2θ - 36 dθ <--Expand

1/2∫ -20 + 32cosθ + 16 1/2 (1 + cos2θ) dθ <--Trig identity

1/2∫ -20 + 32cosθ + 8 (1 + cos2θ) dθ <--cancel 16 and 1/2

1/2 [ -20θ + 32sinθ + 8θ + 4sin2θ]

1/2[-12θ + 32sinθ + 4sin2θ], then I'd replace the θ with the upper and lower limits, however, I get the wrong answer. Where is my mistake? Thanks!

2007-08-26 21:53:42 · 4 answers · asked by Jorm 3

lim x --> 1 2x^1/2 - x - 1/(x-1)^2

2007-08-26 21:51:27 · 1 answers · asked by t m 3

Solve each of the following right triangles. In each case, C = 90 deg. If the angle info is given in deg and min, give the answers in the same way. If given in decimal deg, do likewise in your answers. When two sides are given, give answers in degrees and minutes.

A = 61 deg 00'; b = 39.2cm

Could someone explain this a little to me? I'm a little confused on where to start. (Of course angle B is 29 deg 00'.)

2007-08-26 21:40:06 · 2 answers · asked by Anonymous

1. Urn I contains three red chips and one white chip. Urn II contains two red chips and two white chips. One chip is drawn from each urn and transferred to the other urn. What is the probability that the chip ultimately drawn from Urn I is red?

2. John takes a 20-question multiple choice exam where each question has five answers. Some of the answers he knows, while others he gets right just by making lucky guesses. Suppose that the conditional probability of his knowing the answer given that he got it right is 0.92. How many of the 20 questions was he prepared of?

3. An insurance company has three clients - one in Manila, one in Davao and one in Cebu - whose estimated chances of living to the year 2010 is, 0.7, 0.9 and 0.3, respectively. What is the probability that by the end of 2009, the company will have had to pay death benefits to exactly one of the three?

Thanks! :)

2007-08-26 21:39:35 · 3 answers · asked by infinitelimits 2

For any prime p greater than or equal to 3, prove that the number of non-zero squares in Z (subscript p) = {0, 1, 2, ...p-1} is (p-1)/2

Thanks

Don

2007-08-26 20:30:20 · 3 answers · asked by Anonymous

solve

2007-08-26 20:14:39 · 25 answers · asked by Anonymous

geometry ... the surface area of a right circular cylindar whose radius is 5 inches and height is 12 inches is givien approximatly by 2 * 3.1416 * 5 squared * 12. evaluate this expression rounded to two decimal places

2007-08-26 19:47:20 · 5 answers · asked by Stephani K 1

x^2 + y^2 + z^2 + 4x - 2y + 4z + 5 = 0 and x^2 + y^2 + z^2 = 4. Can anyone help me determine the equation for the intersection of these 2 spheres??

2007-08-26 19:09:03 · 2 answers · asked by Robert W 1

simplify:

2-a^-1-6a^-2
_____________
2-7a^-1-15a^-2

2007-08-26 18:54:22 · 2 answers · asked by Anonymous

I'm stuck on this one section on my Algebra II/Trig summer assignment; the directions say "Write the fraction as a sum of terms." What does THAT mean? I tried searching the web for "sum of terms" but I get all these websites with confusing explanations. Can someone help me, please?

Example problem:

x^2 - 4x + 2 (fraction bar) x

^2 = second power/exponent 2

2007-08-26 18:42:21 · 3 answers · asked by alwaysconfused 2

I have to show that, along the plane curve x=x_1(t)e_1 + x_2(t)e_2, that the curvature is

k = | x_1' x_2'' - x_2'x_1''| / [|(x_1')^2 + (x_2')^2|^(3/2) ]

The formula I've got for curvature is

||T’(t)|| / ||r’(t)||

But how do I get T(t) and r(t) with just x(t)?

2007-08-26 18:27:09 · 2 answers · asked by Albus 2

14-sqrtx/sqrtx

2007-08-26 18:21:09 · 5 answers · asked by Splendidy 1

find the equation of the parabola with its axis of symetry parrallel to the x-axis and which passes throught the points (3,3), (6,5) and (6,-3)

help?

2007-08-26 18:15:26 · 4 answers · asked by Anonymous

2007-08-26 18:06:38 · 5 answers · asked by Anonymous

A small plane can fly 2400 kilometers in 10 hours flying into the wind. With the wind behind it,the plane can fly 3200 kilometers in 10 hours. What is the speed of the wind and the speed of the plane?

2007-08-26 18:00:33 · 6 answers · asked by N/A 4

A helicopter is flying over a lake and sights a boat at an angle of depression of 35 degrees. The water-surface distance from the helicopter to the boat is 2300 feet. Find the altitude of the helicopter to the nearest foot.





1610ft, 3285, 1319ft, 4010ft

2007-08-26 17:54:05 · 3 answers · asked by xlhollisterboi 1

Completing the square help?

how do i complete the square for the following? I can't figure any of these out, please show me all the steps!
1. (9x^2)+(25y^2) = 225
2. (9x^2)-(2y^2)+18 = 0
3. (y^2)-(6y)+(16x)+25 = 0
4. (2x^2)+(2y^2)-(10x)-18y = 1

2007-08-26 17:40:46 · 2 answers · asked by Anonymous

please help!

as clearly as possible.

thank you!

2007-08-26 17:27:05 · 6 answers · asked by Answer 2

for each a, there exist a unique real number 1/a.
*explain why this is not true.

2007-08-26 17:13:54 · 3 answers · asked by j;lkj;lkj;lkj;lkj 2

I have this last problem for homework and I can't figure it out.

Consider a unit circle with an inscribed equilateral triangle. A chord is selected at random. What is the probability that the chord is longer than a side of the triangle?

Wouldn't it be very hard to measure how each chord that could be drawn to make sure it is longer than a side but less than the diameter.

2007-08-26 17:07:13 · 5 answers · asked by Anonymous

I've already asked an algebra question just about five minutes ago, but i've encountered yet another difficult problem..so helP?

the problem is about simplifying algebraic fractions:
[(2) / (x-3)] * [(2x-6) / (8(x+4))]


Thanks

2007-08-26 17:03:35 · 3 answers · asked by Faye 1

2007-08-26 16:55:09 · 2 answers · asked by jumba 1

Okay here it goes:
The sum of three consecutive integers is 90.
a.) Find the three numbers by letting x represent the first integer.
b.) Find the three numbers by letting x represent teh second integer.

2007-08-26 16:31:25 · 8 answers · asked by Danyizzle 4

The amounts of money requested on home loan applications at Down River Federal Savings
follow the normal distribution, with a mean of $70,000 and a standard deviation of
$20,000. A loan application is received this morning. What is the probability:
a. The amount requested is $80,000 or more?
b. The amount requested is between $65,000 and $80,000?
c. The amount requested is $65,000 or more?

2007-08-26 16:30:16 · 6 answers · asked by sweetnsinful33 1

between the raftors in the attic. If the roof is 7m from peak to eave and the attic space is 3 m high at the peak, how long does each of the pieces of insulation need to be?

2007-08-26 16:25:55 · 1 answers · asked by rbot 2

12

2007-08-26 16:15:54 · 6 answers · asked by Kevin P 1