Mathematics - 23 September 2006

hi i need help on how to find the y-intercept of a line. i used to know how to do this but forgot.
one of the problem question is: find y-intercept of line with points : (-5,2) and (8,2)
i have this so far:
y= -5/13 x + b
if you can re-teach me that would be great.

2006-09-23 16:13:54 · 9 answers · asked by krawnikfasho 1

2006-09-23 16:01:20 · 7 answers · asked by Anonymous

2006-09-23 15:56:25 · 9 answers · asked by vaishnavi 1

I am trying to help a 5th grader with her homework and I am having trouble with number patterns.

2006-09-23 15:53:04 · 12 answers · asked by bobbie b 1

This indefinite integral comes from the differential equation
x*y'' = y' + [y']^3. The problem is that my professor told me a way of solving it, but there is a problem with his method though.

OK, now: The first thing is the reduction of order in the differential equation.

If you make the following changes: y' = p AND y'' = (dp/dx)p, what you obtain is x*p(dp/dx) = p +(p^3). If you separate variables, solve for p, then revert the changes and solve for y, you derive my question. BUT, according to the book of Simmons, the answer is C1^2 = x^2 + [y - C2^2]^2, but I do not believe that solving the antiderivative I'll manage to get that!!!

The funny thing is that you DO solve the equation and get the answer if you make the changes: y' = p AND y'' = dp/dx... hahahaha, oh damn!, sorry I have already figured out my mistake, I applied another method. But I would really appreciate if someone could solve the initial question please (the antiderivative).

Thanx!!

2006-09-23 15:46:10 · 2 answers · asked by Anonymous

If the numbers after the decimals don't stop anywhere (like the square root of 2), than its not exact is it?

2006-09-23 15:42:23 · 8 answers · asked by Bob 3

Roberta went to spend her tickets at the local arcade the other day, she wanted to start a collection of small plastic animals. The plastic animals cost 28 tickets each.

However, she got it in her head that, for good luck, the total amount of tickets she must spend must be a number where all of the digits are the same.

With that in mind, what is the minimum number of ANIMALS she must buy?



*hint* Find out how many tickets she must spend, then divide it by 28. The amount of tickets will be high. *hint*

I will be suprised to see how many people can figure this out.

2006-09-23 15:19:08 · 15 answers · asked by Ari 2

that would help me with my geometry homework. i suck at it so bad i need some sort of online tutoring site! please help!

2006-09-23 14:50:20 · 3 answers · asked by alexa 1

Maybe my brain is just fried but:

7: You have 480 feet of fencing to enclose a rectangular garden. You want the length of the garden to be 30 feet greater than the width. Find the length and width of the garden if you use all the fencing.
a.) 50 ft x 80 ft
b.) 40ft x 80 ft
c.) 135 ft x 105 ft
d.) not enough information given

I think it's D because the width isn't provided. What do you think?

2006-09-23 14:47:56 · 22 answers · asked by Ryan 1

there are 10 numbers, 1-10. how many combinations of four can be derived from these ten numbers. the numbers can be repeated, i.e 0000, 1111. how many such combinations can be created by using numbers 1-10?

I'll appreciate it if someone can help for reals. if i am not wrong there is a formula, but i can't recall the formula.
thnx to all b4 hand!

2006-09-23 14:44:11 · 7 answers · asked by Anonymous

x^(1/2 -3) equals x^-5/2. How? I don't see how 1/2 times -3 equals -5/2. Reciprocals? Help.

2006-09-23 14:42:34 · 7 answers · asked by vintagex50s 2

For example I worked this out on my own. Can someone tell me if this is correct, preferably refer me to a web site that has a concise description of where it came from.

f(x)=x^2
d f(x) = d(x^2) dx
d f(x) / dx = d(x^2)

were d means the derivative
Is this right?

2006-09-23 14:07:39 · 3 answers · asked by lanceec 1

Can sum1 please post the derivation for the formulae for
1. volume of a cone and
2. both circular and squared based frustrums

Please keep it simple, thanks

2006-09-23 14:00:35 · 2 answers · asked by benabean87 2

2006-09-23 13:48:19 · 15 answers · asked by Anonymous

A ball is shot from the ground into the air. At a height of 9.1m, its velocity is (7.6i+6.1j)m/s. (i horizontal and j upward)
a) to what max. height does the ball rise?
b) what horizontal distance does the ball travel
(X-Xo=(Vo.COSangle)t right?)
c) what are the magitude and d) angle (below the horizontal) of the ball's velocity just before it hits the ground?


I did figure some parts out; since i is horiz. and j is upward the ball is still climbing. The magnitude of v is sq root of (7.6^2)+(6.1^2)=9.75 m/s and the angle at that moment is arctan(6.1/7.6) = 38.75degr.

I thought by calculating the horizontal range R I would get somewhere but I'm stuck again.
I think with the instantaneous velocity after 9.1m I must be able to calculate the t and the Vo and go from there but how?
Who can help me?

2006-09-23 13:09:19 · 4 answers · asked by dutchess 2

I have to volume and I need to get the radius.

here is the question a sphere has a volume of 3053.63m*3. What is the radius?
and if you could give a step by step anwser?

2006-09-23 12:52:19 · 4 answers · asked by dylanklassen 2

2006-09-23 12:50:43 · 14 answers · asked by Mattie123 1

Rewrite the equation y = print_coeff(m,1)x print_const(b) as a function of x.

2006-09-23 12:45:13 · 5 answers · asked by lawanda p 1

These two tanagrams are just impossible to me! Use the seven shapes of tanagrams to help me solve them. Thank you.

2006-09-23 12:27:39 · 5 answers · asked by dancing queen 2

I already know the solution, (1 - 1/(n+1)) so if you could explain how this is found it would be appreciated. I see this as having some harmonic series in it.

2006-09-23 12:20:56 · 5 answers · asked by rmtzlr 2

I think that I could become great at it if I just gave alot of hardwork and dedication though and what better to do to get better at math than major in it? So I was wondering what do you all think I should do?

2006-09-23 12:14:07 · 14 answers · asked by E-con 1

2006-09-23 12:12:46 · 14 answers · asked by bglenevans 1

integration help

integral of: 2xe^(10x)dx

2006-09-23 12:05:53 · 5 answers · asked by DoughboyFresh 2

Thanks for any help!

2006-09-23 12:04:37 · 7 answers · asked by Gypsophila 3

why must we complete square in order to solve a quadratic equation?
i know how the quadratic formula derived, but in order to get that formula, we have to complete the square. why? how did they know that completeing the square would give the right formula?

i hope u got what i mean*-*

thanks

2006-09-23 11:47:13 · 6 answers · asked by Ganbatteru 3

2006-09-23 11:46:54 · 6 answers · asked by cstoa10 5

calculus question, : express using interval notation. can someone explain wat it means. and answer the question -5____________2?
thx

2006-09-23 11:07:25 · 3 answers · asked by speeds3mu 1

It is possible to calculate the energy of an ocean wave in terms of total energy per unit area of wave ,Ew , using the following equation.

Ew = 1/8 (pgh2)


Where P is the density of water, g is the acceleration due to gravity, and h is the wave height.

Calculate Ew using the appropriate SI units and the following values of p,g and h.

Show all your working and express your answer in scientific notation.

p = 1.03 x 103 kg m-3

g = 9.8 m s -2 Meters per second

H = 145 cm

2006-09-23 11:04:03 · 5 answers · asked by Anonymous

how many months in 900 years?

2006-09-23 11:01:44 · 17 answers · asked by la 1

In the following question find the SI unit of A.

A = square root of hc / G

and where the SI unit of h is Js

The SI unit of c is Ms-1

The SI unit of G is J m Kg -2

2006-09-23 10:56:26 · 4 answers · asked by Anonymous