Mathematics - 9 September 2007

CRITICAL THINKING
Your friend states in a report that the average time to circle a 1.5-mi track was 65.414 s. This was measured by timing 7 laps using a clock with a precision of 0.1 s. How much confidence do you have in the results of the report? Explain.

2007-09-09 16:36:18 · 3 answers · asked by Venia c 1

csc x=-2; x in QIV; cot x=?
tan x=3; x in QIII; sin x=?


I think i know the answer to the first one. The Tan would be -1/sqrt3 (you dont have to rationalize) so the cot would be -sqrt3/1 correct?
Thanks!

2007-09-09 16:29:04 · 2 answers · asked by Kevin D 2

In each minute a pump draws 2.4m³ of water from a well 5m below ground, and issues it at ground level through a pipe of cross-sectional area 50cm². find:
a) The speed with which the water leaves the pipe
b) the rate at which the pump is working.
If in fact the pump is only 75% efficient (i.e. 25% of the power is lost in the running of the pump), find the rate at which it must work.

2007-09-09 16:23:46 · 1 answers · asked by A Freak Like Me 2

2007-09-09 16:14:46 · 10 answers · asked by knwjtw2004 2

Is there a website that could tell me how to imput exponents, square roots, and all those other mathy symbols that don't exist on the keyboard? I like being able to do this kind of thing without always copy-pasting, since I use an IME and type with symbols from other languages.

2007-09-09 16:14:37 · 2 answers · asked by Anonymous

Find a polynomial function with integer coefficients that have the given zeros: (1+squareroot of 3i), 2, 2, (-1-squareroot of 2)

2007-09-09 16:11:55 · 6 answers · asked by kat 2

find the coordinates of the centroid, where the medians are concurrent of a triangle with vertices at (0,0), (a,0), and (b,c).

Plz show work. thx

2007-09-09 16:08:38 · 2 answers · asked by NT 2

Diana’s favourite coin is a dime. She has a whole bunch of them – she does not know exactly
how many, but she is sure that she has fewer than 250. One day she was arranging them on her
desk in different ways. She found the following:
• When she put them in piles of three, there was 1 dime left over.
• When she put them in piles of four, there was 1 dime left over.
• When she put them in piles of five, there was none left over.
How many dimes does Diana have? Is there only one possible answer?

2007-09-09 15:59:52 · 3 answers · asked by Anonymous

be 16.09 x 10 (to the second)

2007-09-09 15:56:49 · 3 answers · asked by Anonymous

Calculate the future sum of $1,000, given that it will be held in the bank for 5 years and earn 10% compounded semiannually.

2007-09-09 15:53:06 · 3 answers · asked by BxBmr76 1

T^3 + 3T - 12T + 4
_______________
T^3 - 4T

The part is factored like (T-2)(T^2 + 5T -2), when multiplied back would give you T^3 + 3T - 12T + 4 (the numerator). Question is: WHY is it (T-2)? What's the logic behind choosing (T-2)?

2007-09-09 15:49:19 · 6 answers · asked by D 3

I'm supposed to take the cube root of negative eight; how do I do this without a calculator (or decimals?)

2007-09-09 15:44:18 · 12 answers · asked by Anonymous

pre cal

2007-09-09 15:39:44 · 1 answers · asked by icygurl555 1

Can someone help me understand how to find this limit.
The answer is actually 0.

Thank you.

2007-09-09 15:37:36 · 2 answers · asked by rivaldo 1

y=7x-5 and y =3/8x+5

2007-09-09 15:37:33 · 4 answers · asked by DJ BIGMAC 1

im not very good with math and im having trouble with this wrksht we got. its with fives. like you can only use the number five four times to get an answer.

we're supposed to put and operation where the blank is. I did like all of them except for a few. anyone got any clues to help me with these?


5 _ 5 _ 5 _ 5 = 9

5 _ 5 _ 5 _ 5 = 4

5 _ 5 _ 5 _ 5 = 3

5 _ 5 _ 5 _ 5 = 5

2007-09-09 15:37:20 · 4 answers · asked by Anonymous

11cg=___mg


how do i convert that?

2007-09-09 15:35:14 · 6 answers · asked by kjhk 1

2007-09-09 15:35:10 · 5 answers · asked by Richard C 1

please help

i have this graph with two lines. The first one is an open cirlce that is open that starts on (-1,-1) and goes forever down intececting (-3, -5).

the second line starts as a small closed dot at (-1,-3) and dips down to (0,-4)then goes up intercecting (2,0) and then intercecting (3,5) and going on forever.

the question that i have is what is the value of x at which g(x) is not continuous.

2007-09-09 15:28:19 · 2 answers · asked by fvsdf s 2

ok i'm expecting a check in the mail for october but it is prorated. i'm being paid from october 1st till october 22 nd. the normal total would be $550.00. What is the pro rated amount?

2007-09-09 15:25:53 · 4 answers · asked by Anonymous

Write a check to show that 2+5i and 2-5i are the two solutions to the equation x^2-3x+30 = x+1.

2007-09-09 15:20:32 · 2 answers · asked by gocubsgo18516 1

2007-09-09 15:16:09 · 6 answers · asked by wendy f 3

Question: Show that "f" is continuous on (-oo, oo)

f(x) = { sinx if x < pi/4 , cosx if x > or = pi/4 }

I'm really stuck. I don't know how I should work this problem.

Any help is appreciated. Thanks.

2007-09-09 15:15:46 · 6 answers · asked by shih rips 6

A wire is stretched from the ground to the top of an antenna tower. The wire is 20 ft. long. The height of the tower is 4 ft. greater than the distance d from the tower's base to the bottom of the wire. Find the distance d and the height of the tower.

2007-09-09 15:11:52 · 6 answers · asked by Brandon 1

a) A standard sheet of paper measures 8 1/2 by 10 inches.
The area of one such sheet of paper is 0.0549m^2

A second sheet of paper is three-quarters as long and three-quarters as wide as the one described in part (a). By what factor is its area less than the area found in part(a)?


I understand that all you have to do is (.75)(.75) to get the percentage but by what FACTOR would this be off by?

Thanks so much for your help! God Bless!! :)

2007-09-09 15:07:13 · 2 answers · asked by PaNaSoNiCeDgE 1

2007-09-09 15:06:21 · 7 answers · asked by jman146 2

Can someone show me how to do this.
Factor by grouping
x^5+4x^3-2x^2-8
thanks so much

2007-09-09 15:05:13 · 2 answers · asked by dtrain2419 1

2007-09-09 14:55:54 · 5 answers · asked by Kurt v 1

What is the formula to find the 21st term?

0, 1/6, 1/3, 1/2, .... Find the 21st term.

2007-09-09 14:51:42 · 4 answers · asked by Anonymous

Find the equation of the tangent line to the graph at t = pi/2

y=_____x + _______

Please explain b/c i thought the derivative would be
cos(12*pi/2) * 12 + 5 - sin(pi/2) = 16 but the 16 isnt the answer!

2007-09-09 14:41:07 · 5 answers · asked by zahras01 1