Mathematics - 29 August 2007

2007-08-29 11:42:08 · 2 answers · asked by blessed 1

here are a couple of the problems I am facing.

f(x) = 5x^2 + 2x - 1


f(x) = 3y / x + 5

2007-08-29 11:38:17 · 3 answers · asked by Big Bob 2

The sides are 2mm x 2km x 7mm

What do I do with the km?

28 mm2 km? Hmmmm???

2007-08-29 11:36:11 · 7 answers · asked by Me 4

Look at the graph and comment on the sign of D or the discriminant. Form the quadratic equation based on the information provided and find its solution. The points are (-1,0), (0.67,0), and (-0.16,2) which is the vertex.

2007-08-29 11:27:23 · 2 answers · asked by Anonymous

I think its the stars is that right?

2007-08-29 11:22:44 · 5 answers · asked by Jdotski Z 1

Two 6-sided number cubes are rolled 270 times. The sum of 5 comes up 42 times. To the nearest hundredth, what is the experimental probability of rolling a sum of five? What is the theoretical probability of rolling a 5? Compare the 2 results.

2007-08-29 11:20:58 · 5 answers · asked by Anonymous

For instance what is:

256
x 23

or

256
x123

Please show working out? I have forgotten how to work out long multiplication by hand. I need to know in preparartion for a job interview tomorrow that is going to involve a few numeracy and written tests.

Thanks

2007-08-29 11:18:52 · 16 answers · asked by Anonymous

Prove that (1/9) is less than or equal to SQRT(66) -8 which is less than or equal to (1/8)

(without computing SQRT66 to 2 decimal places!)

Hint: Recall the Mean Value Theorem.

Can someone please show me how to do this problem without using "integral" or integration... just using elementary calculus i guess....


thank you!

2007-08-29 11:13:45 · 2 answers · asked by DSS 1

what is the domain of the following...?

s(y)=3y/ y=5


f(t)= ^3 square root of t + 4



h(x) = 10 / x^2 -2x



f(s)= suare root of s-1 / s-4



~thank you so much

2007-08-29 11:11:48 · 2 answers · asked by Jasmeen 3

Suppose that 25% of all wise people are nice and half of all nice people are wise. Suppose further that 25% of all people are neither wise nor nice. What percent of all people are both wise and nice?

2007-08-29 10:57:08 · 3 answers · asked by Anonymous

Suppose f:R-->R is differentiable at a. Let u and v be real valued functions defined on a neighborhood I of a such that u - v doesn't vanish on I - {a} and such that u(x) --> 0 and v(x) --> 0 as x --> a. Then, is it true that

lim ( x -->a) [f(a + u(x)) - f(a + v(x))]/(u(x) - v(x)) = f'(a)?

2007-08-29 10:54:38 · 1 answers · asked by Steiner 7

2007-08-29 10:54:19 · 3 answers · asked by blessed 1

use mathematical induction to prove that 21 divides 4^n+1 + 5^2n-1 for n=1,2,3......
Use headings base case and induction?

So letting p(n) be the proposition that 21 divides 4^n+1 + 5^2n-1
I can prove the base case is true, that is p(1), where n=1 is true since 4^2 + 5^1= 21 and clearly 21 divides 21
I am struggling with induction, that is, assuming p(k) is true, where p(k)=4^k+1 + 5^2k-1, and proving from that p(k+1)???

2007-08-29 10:25:38 · 2 answers · asked by Anonymous

Given the function defined by y = x + sin x for all x such that
[-pi/2, 3pi/2] for x.

(a) Find the coordinates of all maximum and minimum points on the interval. Justify your answers.

(b) Find the coordinates of all points of in
ection on the given interval. Justify your answers.

(c) Sketch the graph of the function, labeling all the points you found in (a) and (b).
i guess i can just do part c wod b easier after parts a and b

please explain
thank you!!

2007-08-29 10:21:22 · 5 answers · asked by DSS 1

2007-08-29 10:11:33 · 21 answers · asked by notmygame 6

2007-08-29 09:53:57 · 7 answers · asked by notmygame 6

If they are the four corners of a rectangle, and why?

2007-08-29 09:53:44 · 3 answers · asked by Anonymous

WHAT iS 63+2X-7-4X

2007-08-29 09:52:26 · 7 answers · asked by PRiNCESS 1

For example:
1.45 * 10^0 = 1.45
and
1.45 * 10^3 = 1450.

Just need to make sure im doing my chemistry homework correct. (Significant numbers)

2007-08-29 09:50:31 · 7 answers · asked by Anonymous

f(x)=(x^2 +16x +164 +6400x^-2 +1600x^-1)^(1/2)

2007-08-29 09:46:59 · 2 answers · asked by DSS 1

So heres the math problem..

Theres a farmer and he wants to get some cattle to increase his monthly profit. The trouble is, is that he has no room to put them. So he goes out and buys 2000 ft. of fence. He has a barn which is 80 ft wide and 160 ft long, however it is completely full of machinary and NO cattle can go in the barn. The question is, what way can he put the fence to get the MOST square feet , so he can put the most cattle in , and make the most money. Remember the cattle must fit in the fencing and they cant go in the barn however you could use 160 ft of the side of the barn as fencing. You can put the fencing in any shape but I think it is going to have to go into a square. thanxs :)

2007-08-29 09:43:30 · 5 answers · asked by brewer37 1

I know I should know this, but it slipped my mind
When I add or subtract polynomials, how do I know which sign to use?
Example problem: (I don't know how to do the squared and cubed, so I'll just write it)
(12c squared + 3cd-5d squared) + (6cd+2d squared)
I can simplify it, until I get down to figuring out what sign to use.
please help lol

2007-08-29 09:34:49 · 4 answers · asked by Ina 2

Simplify expression.

(x+h)^-3 -x^-3
__________
h


x^-1+y-1
_______
(x+y)^ -1



This one is hard
1+___1_____
1+ 1/ 1+ x


and this one

http://i51.photobucket.com/albums/f399/Raymondxv12/math.jpg

2007-08-29 09:30:13 · 2 answers · asked by Cowman 1

1. (F-32) 5 over 9 =C
If F equals 50 what does C equal?

2. There is a math sign that is a ">" over "_" and one that is "<" over "_". what does it mean?

3. x I 0.5 I 1 I 2 I 4 I 5 I 10 I
y I 2 I 1 I 0.5 I 0.25 I ? I ? I
what is the rule? and what does 5 and 10 equal?
^^Sorry about the "graph" I can't make it any better...

thanks. also, please provide an explanation with your answer!

2007-08-29 09:23:21 · 3 answers · asked by NinjaX 2

answer is (2+ln(x))/(2x^(1/2))

no idea how to arrive there. thanks

2007-08-29 09:11:00 · 5 answers · asked by Anonymous

2007-08-29 09:06:59 · 4 answers · asked by whisper2ya 2

Okay, I really need help with these problems on my Algebra homework.

Directions: Solve Each Formula for the indicated variable.
V=pi/3 r^2h, for h

Directions: Solver for x. State any restrictions on the variables.
a(x + c) = b(x - c)

I have another problem that goes under the first set of directions that I am stuck on.

S = (cursive L)w + wh + (cursive L)h, for w.

Any help would be appreciated. I would really appreciate if you add how to do the problems also.

2007-08-29 09:02:37 · 1 answers · asked by Anonymous

EXPLAIN??

2007-08-29 08:59:32 · 5 answers · asked by Girl 1

2007-08-29 08:57:20 · 13 answers · asked by xjohnson_2011x 1

A machine is used to fill each of several bags with 16 ounces of sugar. After the bags are filled, another machine weighs them. If the bag weighs .3 ounces more or less than the desired weight, the bag is rejected. Write this equation to find the heaviest and lightest bag the machine will approve

I know the answer is 15.7, and 16.3, but the equation?

2007-08-29 08:50:40 · 5 answers · asked by Anonymous