Mathematics - 4 November 2007

2007-11-04 09:55:33 · 6 answers · asked by tank 1

and these are quadratic equations and complex numbers.
2. x^2+3x+9
4. 4x^2+4=x
6. 4x=4x^2+7

2007-11-04 09:52:52 · 1 answers · asked by Diamond E 1

how do i work out what x and y are from this equation:

xa + yb = 7i + 6j - 11k

where a = 4i + 6j - 2k
and b = 2i - 6k

2007-11-04 09:51:04 · 1 answers · asked by fpa06mr 5

can you please help me solve and graph

2007-11-04 09:49:09 · 1 answers · asked by Anonymous

plz help. i asked someone but it was too confusing

2007-11-04 09:31:14 · 2 answers · asked by cocopuffs 2

an=sqrt(n+5)/(8n+5)
an=1/(4n+7)
an=(cosn)/(5^n)
an=(n-7)/(n+7)

2007-11-04 09:27:38 · 1 answers · asked by Cindy 1

a telephone plan is $35 for 400 minutes and $4.00 a mintue per extra minute. Mary uses 600 that month. Write a piecewise function.

thanks!

2007-11-04 09:22:28 · 6 answers · asked by name has been deleted 1

2007-11-04 09:21:02 · 7 answers · asked by Anonymous

explain if no and if yes is there a function that i could graph to prove it?

there is no specific interval in which this has to happen

2007-11-04 09:20:26 · 1 answers · asked by Anonymous

its a piecewise function

true or false and WHY?
IF...
f(x)= {3, x<0
{x^2, 0 {7, x>4

then f(3)=0,

i dont understand this. is it true or false. and i need an explanation, thanks!

2007-11-04 09:18:38 · 1 answers · asked by name has been deleted 1

2007-11-04 09:09:14 · 1 answers · asked by Anonymous

2007-11-04 09:07:39 · 1 answers · asked by Anonymous

For Example, take the anti derivative of (4x+1)^(1/2)

2007-11-04 09:06:28 · 8 answers · asked by Anonymous

plz help me

2007-11-04 09:03:22 · 2 answers · asked by cocopuffs 2

Sarah's new country home needs electricity. Her new house is in the woods eight miles straight back from the highway(along the road), and twelve miles from the nearest substation (which is next to the highway). It costs $400 per mile to extend existing lines along the highway, $550 per mile along the roads and $850 per mile to run them through the woods. If Sarah wants to minimize the cost of the new lines, find the best path to lay the lines. Be sure to check the cost of the two extremes: following the roads entirely, cutting through the woods entirely. Then use calculus to minimize the cost of following the road for a bit and then cutting through the woods. In your answer be sure to explain how far to follow the highway and what distance it will be through the woods?

2007-11-04 09:03:03 · 2 answers · asked by lilviet_devil 1

calculus

2007-11-04 09:02:27 · 1 answers · asked by Anonymous

What is the answer of -5 - x over 4x+1 = 10x+15 over 3x? I'm kinda lost...

2007-11-04 08:53:02 · 3 answers · asked by Anonymous

√(50x^6y^5)

2007-11-04 08:51:50 · 3 answers · asked by Anonymous

2007-11-04 08:48:18 · 1 answers · asked by Anonymous

Suppose that p/q is a rational number such that
137/2008 < p/q < 137/2007, and that p and q
are relatively prime positive integers.
a. What is the least possible value for q?
b. What is the 2007th smallest possible value for q?

I got as far as

0.06822...< x < 0.06826
like the title says this is like impossible to get!

2007-11-04 08:47:17 · 4 answers · asked by ? 2

2007-11-04 08:45:39 · 22 answers · asked by HaZiM 1

2007-11-04 08:42:54 · 6 answers · asked by Tesia G 1

The amount of rain we got last month was 2 inches more than what we got this month. we got 3.5 inches last month. how would i write this in an equation

2007-11-04 08:40:15 · 4 answers · asked by Yeboseyo? YAH Yeboseyo!? 2

Find dy/dx of:


xy^2 = ln (y) + xy^3

2007-11-04 08:29:27 · 4 answers · asked by aguardiente3 2

2007-11-04 08:28:33 · 1 answers · asked by arandjbar15 2

2007-11-04 08:15:59 · 2 answers · asked by Anonymous

1. the incenter, centroid, and orthocenter are always inside the triangle. T or F?

2. It is not possible for a trapezoid to have 3 congruent sides. T or F?

2007-11-04 08:15:16 · 6 answers · asked by Anonymous

if the hypotenuse of a right triangle is 12ft and a side is 6ft what is the length of the other side express your answer in radical form?

2007-11-04 08:12:54 · 6 answers · asked by Anonymous

Let f(x) = sqrt(225-x^2) Use differentials (linear approximation) to estimate f(12.1). Base your approximation at x = 12 . Give your answer to at least 4 significant figures or use fractions.

2007-11-04 08:09:47 · 2 answers · asked by bball10010 1

Ok this equation is -2log3 1?x + 1/3log3 sqrt x


For some reason I keep getting 1/2log3x but I have a strong feeling that this is not correct at all can someone help me get on the right track please?

2007-11-04 08:06:44 · 2 answers · asked by iknownothing17 1