Mathematics - 5 October 2006

How many horsepower is a 350 W lightbulb?
How many watts is a 120 hp car?

2006-10-05 17:07:43 · 3 answers · asked by E 1

Solve the system by addition or substitution.
3x – 4y = 8
6x – 2y = 10

2006-10-05 16:46:20 · 8 answers · asked by Anonymous

I've taught him the "nines with your fingers" trick, and of course he can do the 2's and 5's pretty well, but otherwise he really struggles. I don't know how to help him or make it any simpler because it comes so natural to me. I don't want to make him feel stupid, but sometimes I think he catches onto my frustration. If anyone has any advice on teaching him I would so appreciate it!!

2006-10-05 16:27:00 · 12 answers · asked by cakelady 3

round the result to the nearest hundredth.
4.17n + 3.29 = 2.74n

2006-10-05 16:23:48 · 4 answers · asked by NABEELiOS 1

Do all that in order that's just number one on my math problems.

2006-10-05 16:13:12 · 5 answers · asked by Circus 1

Can someone please help. I have litterally done everything that I can think of and there is nothing working. The only two symbols you cannot use though are e and Pi. And I was told that you can use one more number. Could the answer be 2^Log base 2 of 5?

2006-10-05 16:12:47 · 6 answers · asked by Anonymous

2006-10-05 16:09:41 · 14 answers · asked by bran o 1

I'm ot asking for answers but i need help. here is the problem:

Ramon rented a sprayer and a generator. On his first job, he used each piece of equipment for 6 hours at a total cost of $90. On his second job, he used the sprayer for 4 hours and the generator for 8 hours at a total cost of $100. What was the hourly cost of each piece of equipment?

PLEASE READ IT CAREFULLY!!!!! Thanx!

2006-10-05 16:06:31 · 4 answers · asked by Hopeicouldhelp 4

2006-10-05 16:01:10 · 7 answers · asked by judy k 1

don't give me the result, I need the procedure.. it gives me something like ( (-1)(4) )^-3 = 1/(-1^-3) * 1/(4^3) but the calcularor gives me -1/64 so where is my error???

2006-10-05 15:58:59 · 5 answers · asked by Anonymous

4/2 is the 4 the denominator or numerator?

2006-10-05 15:58:21 · 5 answers · asked by raiders1008 1

2006-10-05 15:47:47 · 3 answers · asked by Uncle Gus 1

I want to find the area under a curve described by parametric equations x = f(t) and y = g(t). I can show that the area is the integral of g(t)f'(t)dt (from t1 to t2), but does this work for a curve that fails the vertical line test? That is, can I use the formula to find the area of a circle desribed parametrically? (x=cost, y=sint) or some other function where x'(t) is not always positive? It doesn't always seem to work for me, but maybe I'm missing something.

2006-10-05 15:45:40 · 2 answers · asked by Anthony S 2

2006-10-05 15:44:17 · 12 answers · asked by Anonymous

f(xy)=(x^3,y^(2.5)), find the directional derivative at (4, 5) in the direction theta = (2*pi)/3

2006-10-05 15:37:21 · 1 answers · asked by topgun553 1

2006-10-05 15:33:07 · 3 answers · asked by Anonymous

If the problem is (x+7) - (-x-t) does it = x+7+x+t ??

2006-10-05 15:31:53 · 12 answers · asked by n4rumi 2

I don't know how to simplify ratical expressions. Will someone please explain it to me.

2006-10-05 15:31:20 · 3 answers · asked by Steph 4

2006-10-05 15:29:08 · 7 answers · asked by Magge R 1

I am trying to understand this example my book gives of partial derivatives of functions with more than two variables.

(please note, I'm using extra parantheses for clarity)

If f(x,y,z) = (x^3)(y^2)(z^4) + 2xy + z then

1. (df/dx) = 3(x^2)(y^2)(z^4)+ 2y
2. (df/dy)= 2(x^3)y(z^4) + 2x
3. (df/dz) = 4(x^3)(y^2)(z^3) + 1

My questions:

In #1, what happened to the last z term?

In #2, again, what happened to the last z-term?

In #3, what happened to the 2xy?

It appears that I don't know some particular rule about partial derivatives, so I don't understand why these derivatives are the way they are.

Thank you SO MUCH!

2006-10-05 15:20:17 · 4 answers · asked by 99 ways to smile 4

this year it is 3 ft shorter and 1 ft wider with same area. what is the length and width of last year's garden. please help. i am helping somebody too but i am stuck.

thanks

2006-10-05 15:16:43 · 5 answers · asked by ola 2

2006-10-05 15:09:30 · 5 answers · asked by Anonymous

There are a total of eighteen ghosts, witches, and scarecrows at the haunted house. The number of witches is 4 less than the number of ghosts. The number of scarecrows is 5 more than the number of witches, How many ghosts and witches are at the haunted house?

2006-10-05 15:03:53 · 11 answers · asked by Anonymous

(x+1)(x-2)(2x) divided by two

2006-10-05 14:57:19 · 9 answers · asked by bob s 2

2006-10-05 14:56:15 · 8 answers · asked by tommyjohn 1

2006-10-05 14:47:43 · 12 answers · asked by meow 2

It says "A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 3ft/sec.
a: Find a fuction r(t) for the radius in terms of t (If I am not wrong...it is t=y/3
b. Find the fuction A(t) for the area of the ripple in terms of the radius r (I am not sure about this one. Do I just take A=pi (r squared) and put it in terms of r?
c. Find A(r(t)). Explain the meaning of this function. (definetrly, I don't know what to do here)

thank you

2006-10-05 14:42:30 · 4 answers · asked by ABC 4

Can some one help me solve thiS:

f(x) = x squared - 1; f(x+h) - f (x) divided by h


please ppl~~

2006-10-05 14:41:08 · 3 answers · asked by Anonymous

How would u write this number in words???
1,214,679.1421

2006-10-05 14:37:48 · 11 answers · asked by yourbiggestfan:) 4

Can you please explain the reason, and also write the chart [Statement, Reason,] if possible.

2006-10-05 14:37:11 · 3 answers · asked by Anonymous