Mathematics - 24 September 2007

2007-09-24 21:27:47 · 5 answers · asked by Anonymous

Line l goes throught the point (2,–4) and is perpendicular to the line through (–6, 5) and (–3, –2). Find the slope of l. Match your result to the correct answer below.
A) 37
B) 73
C) -73
D) 0

Which of the following equations represents a line l that goes through (2,1) and has slope –3?
A) y = –3x + 6
B) y = –3x + 3
C) y = 3x – 7
D) y = –3x + 7

. Find the equation (in standard form) of the line through (5, –5) and (8, 1). Match your result to the correct answer below.
A) 2x + y = 15
B) x – 2y = 30
C) 2x – y = 15
D) 230xy−=215

2007-09-24 21:27:27 · 2 answers · asked by Lady E 1

2007-09-24 21:26:24 · 3 answers · asked by Anonymous

2007-09-24 21:24:53 · 2 answers · asked by Anonymous

I have a sphere that weighs 56.7 grams. Also, I know that the sphere has a density of 11.352 grams per cubic centimetre.

Is it possible for me to find the radius of the sphere. I was thinking of perhaps trying to use the sphere volume formula which is:

4/3 * pi * radius cubed

Perhaps I could get the radius isolated but I'm kinda struggling. Is it possible to find the radius using only the mass and density? I know the answer is like 21.208 or something but I don't know how to get it.

Please help! Any answers or help are appreciated. Thankyou!

2007-09-24 21:08:22 · 9 answers · asked by รզlεսռց ☆ 6

a. (64/27)^-1/3 X 125^2/3


b. if 6x=5^1000 , find x

2007-09-24 21:08:15 · 7 answers · asked by Anonymous

a. let y = 0.4 when x=2.5. Find y when x=4

b. The number of hours, h that it takes m men to assemble x machines varies directly as the numbers of machines and inversely as the number of men. If fore men can assemble 12 machines in four hours, how many men are needed to assemble 36 machines in eight hours.

2007-09-24 21:05:18 · 4 answers · asked by Anonymous

a. 2+3/24(x/4-1)=1/3 solve the x


b. evaluate 2^2 + (2x)^2/log₂ 32

2007-09-24 20:56:52 · 3 answers · asked by Anonymous

a . log₂ 5 + 3 log₃ x=3

b. If x=2y-4 and y = 7s + 1, express s in term of x

2007-09-24 20:51:37 · 3 answers · asked by Anonymous

1. The price of a 2-hour plumbing repair job is $130 and the price of a 5-hour job is $250. Find the slope of the line. Match your result to the correct answer below.
A) $50/hr B) $180/hr C) $40/hr D) $120/hr

2.The price of a 2-hour plumbing repair job is $130 and the price of a 5-hour job is $250. Write an equation for the cost of a t-hour repair job and use the equation to find the cost of a repair job lasting 6 hours.
A) C = 50t + 40; $340
B) C = 40t + 50; $290
C) C = 40t; $240
D) C = 40t + 40; $280

Thank you for any help that you can give.

2007-09-24 20:48:12 · 4 answers · asked by Lady E 1

i tried finding the derivative of x^3 +2x2+2. i try it on the calculator and it gives me the derivative at a certain point. so it gives me a numerical value.

i know that the derivative of x^3 +2x2+2 is. i know that its 3x^2+4x. i just want to find out how to find it in this format instead of a numerical value on the calculator.

thanks.

2007-09-24 20:45:06 · 1 answers · asked by diehard4ever319 1

The pilot of a small boat measures and determines that the angle of elevation of the the top of a lighthouse is 19°. The Lighthouse reaches 21m above sea level. Find the distance between the boat and the lighthouse.

I don't know which function to use because when I draw the right angle the problem doesn't tell you which is x and which is y.

2007-09-24 19:58:29 · 5 answers · asked by SUPERMAN 2

What is the probability that you would give someone your last dollar?

What is the probability that you would give your last dollar to someone selfish enough to take your very last dollar?

2007-09-24 19:56:28 · 3 answers · asked by Tasm 6

f(x) = 9x + 9 ;
g(x) = 32x+3 ;
h(x) = 27 (9x) ;
define the same function.

2007-09-24 19:41:53 · 1 answers · asked by Anonymous

Find the volume of the solid obtained by ro-
tating the region A about the line x + 4 = 0 :

2007-09-24 19:40:45 · 1 answers · asked by Anonymous

Does the integral from 4 to infinity of (3+sinx)/x diverge?
I need to use a direct comparsion test to figure this out but I dont know what to comapre it to.
any help is much appreciated

2007-09-24 19:25:35 · 3 answers · asked by starz8 2

lim x --> -2 f(x)/x^2=1
find :
a. lim x--> -2 f(x)/x = ...??
b. lim x--> -2 f(x) = ...??

Can somebody help me to solve this question
I cant solve this question..
thx in advanced..

2007-09-24 19:15:54 · 1 answers · asked by xXx 1

i need it right away because this h/w is due tomorrow the equasion is


1.what is the volume of a box that is 2 cm. wide, 3 cm. thick, and ten cm. long

how do you figure out volume by multipling adding subtarcting what is done please help me an give me the answer i'd appreciate it and in return i will CHOOOSE A BEST ANSWER if it helps me out the best one by tonight wilol be chosen by me its already 11:07 pm and i need help by midnight


thanks

signed

----** -me-**----

2007-09-24 19:14:35 · 13 answers · asked by Eminuhh☮ 4

& 56°17' (angle measure) to degree.

Another trig ?:

When you solve right angles how do you know which side is x and y. How do you know which function to use such as tan, sin, cos? THANKS!

2007-09-24 19:12:01 · 7 answers · asked by SUPERMAN 2

I just thought about this. Stupid question some would say; a brain killer to others.

The graph of x/x should be similar to the graph of 1, but since there's a variable in the denominator, then the domain for x/x is all real numbers except x=0.

Therefore, there is a 'hole' at x=0 on the graph of x/x, whereas the graph of 1 is continuous everywhere. Now, it is said that anything divided by itself is equal to one, but how about the case of x/x?

If you simplify x/x, it would be equal to one, but by leaving it as is, it isn't quite the same.

Anyhow, just a matter I thought would be interesting to point out.

And no, I'm not on crack, thank you.

2007-09-24 19:06:01 · 6 answers · asked by J. Morrissey 2

3/4(x+2)=27/8 {Given replacement for X....1/2, 1, 1.5, 2, 2.5}
can anyone solve this?

2007-09-24 19:00:00 · 1 answers · asked by Seung7 1

wel..again i face anther project for math..
which is calculus...any application in this topic..
i knw u guys will suggest to find volume and area using anti derivative..but i dont want it..others application??but i dun have idea..someone help to figure out what project should i do..and hope it is with the answers because easy for me to refer back....thanx

2007-09-24 18:48:58 · 4 answers · asked by Anonymous

2007-09-24 18:47:15 · 3 answers · asked by horse 2

f(x)={ 2x+9 for x<(or equal to)3
-4x+c for x>3

2007-09-24 18:42:31 · 2 answers · asked by lexi p 1

http://i20.tinypic.com/juvdsg.jpg

http://i20.tinypic.com/15ouxyc

http://i22.tinypic.com/mjwg49.jpg

can you help me complete the black ones, and check the ones that are already filled in? thank you!

2007-09-24 18:37:28 · 1 answers · asked by Anonymous

The operations manager at a light bulb factory wants to determine whether there is a difference in the average life expectancy of bulbs manufactured on two different types of machines. The process standard deviation of Machine I is 110 hours and of Machine II is 125 hours. A random sample of 25 lights bulbs obtained from Machine I indicates a sample mean of 375 hours &a similar sample of 25 from Machine II indicates a sample mean of 362 hours. Using the 0.05 level of significance, which of the following statements offers the most accurate and appropriate measure that there is not enough evidence to conclude that there is a difference in the average life of bulbs produced by the two types of machines?
A. Z = 0.3904 and is between the critical bounds of plus or minus 1.96
B. t = 0.0117 and is between the critical bounds of plus or minus 2.01
C. t = 1.3829 and is between the critical bounds of plus or minus 2.01
D. Z = 0.424 and is between the critical bounds of plus or minus 1.96

2007-09-24 18:16:02 · 1 answers · asked by jane 1

3y-7y=28

2007-09-24 18:13:25 · 7 answers · asked by Mariana O Moustro 1

use a power series to find a power series representation of the given function. then determine the radius of convergence of the resulting series.

f(x)= x / (9-x^2)

PLEASE HELP!

2007-09-24 18:08:44 · 3 answers · asked by chris s 1

A pile starts with n sticks, with n>=2. The pile is split into two piles, and the product of the sizes of the piles is calculated. One of these new piles is then split into two piles, with the product of the sizes of these two new piles calculated and added to (the sum of) the previous product(s). This process continues until we have n piles with 1 stick in each.
For example, starting with 5 sticks, we could split 2, 3 (giving 6), then 2, 2, 1 (giving 6 + 2), then 1, 1, 2, 1 (giving 6 + 2 + 1), then 1, 1, 1, 1, 1 (giving 6 + 2 + 1 + 1 = 10).
Prove using strong induction that, no matter how the pile is split, the total at the end is always 1/2(n^2 -n).

Help?

2007-09-24 18:03:37 · 2 answers · asked by Anonymous

express the answer in terms of intervals if possible. may need inf and cup symbols.

2007-09-24 18:03:19 · 2 answers · asked by icygurl555 1