Mathematics - 12 September 2007

I need multiplication shortcuts on two-digit numbers. Examples are multiplying two digit multipliers to three digit multiplicand. Please help me with this!

2007-09-12 23:49:20 · 7 answers · asked by Anonymous

i need to transform 3\4 into percentage...
help

2007-09-12 23:49:15 · 11 answers · asked by avia b 2

Find the x, y and z intercepts of the plane -2y+z-1=0

2007-09-12 22:24:44 · 3 answers · asked by nadanilnone 1

prove
1-sin2x
------------- = tan^2[pi/4 -x]
1+sin2x


2. if A & B be the two distinct two real numbers satisfying the equation acosx +bsinx = c then prove that
1. sin(A + B) = 2ab
---------
a^2 + B^2

2. tan (A+ B) = 2ab
-----------
a^2 - b^2



if A+B+C =pi then prove that


cosA + cos B + cosC
------------ ---------- ---------- = 2
sinBsinC sinCsinA sinAsinB
& also prove that

cos4A + cos4B + cos4C = -1+4cos2Acos2Bcos2C

2007-09-12 20:42:56 · 2 answers · asked by Anonymous

<0,0,0,1><0,0,2,1><0,3,2,1><0,1,-1,1> I know these vector are linearly dependent but I cannot find the solution to
w=0 2z+w=0 3y+2z+w=0 y-w+z=0 other than w=x=y=z=0.

2007-09-12 20:23:55 · 2 answers · asked by Hungton L 1

2007-09-12 20:21:50 · 4 answers · asked by ? 3

2007-09-12 19:57:21 · 10 answers · asked by Anonymous

What are some things you can measure? What units (labels) would you use for each?

2007-09-12 19:14:38 · 10 answers · asked by Sarah S 3

2007-09-12 18:54:33 · 7 answers · asked by Bill W 【ツ】 6

if u v and w are vectors that are linearly independent will u-v v-w and u-w be linearly independent?

2007-09-12 18:18:12 · 5 answers · asked by Hungton L 1

This is a math question. (blank) represents the missing answer

2007-09-12 18:07:56 · 5 answers · asked by VCA 1

25 cm 2

Need immediate help, please.

A person that gives the best answer will get 10 points. :)

2007-09-12 18:07:18 · 2 answers · asked by madeinczech 5

A particle moving along a straight line has position x meters at time t >0 seconds given by the formula: x=t^2-3t-1/t

Correct me if I'm wrong
v(t)= t^(-2) + 3t - 3
a(t)= -2t^(-3) + 2

My logic is that a particle will have maximum velocity when acceleration is 0 (So, the particle will not get faster). So, you set a(t)=0 and input the values of t into v(t) and the highest number is the maximum velocity. Is this logic correct?

2007-09-12 17:38:41 · 3 answers · asked by Jeff K 2

it says that you have to group...


b^2-9b-b+9=0...

2007-09-12 17:31:37 · 4 answers · asked by Jay-j 2

I have to write a formula representing the least number of moves possible to move the disks in the Tower of Hanoi to the proper position. With 2 disks, 3 moves are required, 3 disks require 7 moves, 4 disks require 15 moves and 5 disks require 31 moves. How do I go about writing a formula where "n" equals the number of disks and come up with the number of moves required?

2007-09-12 17:29:57 · 3 answers · asked by moira77 4

A fire is sighted from two ranger stations that are 5000m apart. The angles of observation to the fire measure 52 degrees from one station and 41 degrees from the other station. Find the distance along the line of sight to the fire from the closer of the two stations?

I tried doing this problem more than 5 times but I can't seem to get the right answer

2007-09-12 17:20:24 · 5 answers · asked by Anonymous

For the life of me I can't remember how to solve this all the way. I remember doing it but I can't think of it now. If someone would be so kind as to help me with these 2 problems and maybe explain how they did it, I would be very thankful!

Solve for x:

6x - 4/3 = 3/4x + 1/3

and

5(x+1) = 7x+3

2007-09-12 17:12:42 · 12 answers · asked by Vicki 3

its says...

-Graph each linear equation.

1.) y = 2x + 1

2.) y = 5 - 2x

3.) y = -x - 2

4.) y = 1/3x - 5

how do i graph theses and can someone show me how to do theses step by step -.-''

5.)Find the slope of the line containing the points (-2,4) & (8,-3)

6.)Use the slope and y-intercept to graph the equation 1/2x + y = 4

7.)Write down the equation in slope-intercept form for the line with the indicated slope, m , and y-intercept, b.
m = 2 , b = 0.75

8.)Write down the equation in slope-intercept form for the line with the indicated slope, m , and y-intercept, b.
m = -5 , b = 0

9.)Find the slope of the line containing the indicating points.
(0,0) and (3,30)

10.)Find the slope of the line containing the indicating points.
(1,-3) and (3,-5)


please tell me how to do theses things and show your work if you can, because i really need to know how to do theses things to past high school im in 10 th grade -.-''

thanks in advance!!

2007-09-12 17:00:09 · 5 answers · asked by xucx2103x 2

Here are the two if them

1. A = (1/2) (b+B)h ; solve for B

2. S = rT + (1/2)aT^2; solve for a

Please help me

2007-09-12 16:57:37 · 11 answers · asked by Pentax 1

Two cranes are lifting identical steel beams at the same time. One crane is putting twice as much power out as the other. Assuming frictions are negligible, what can you conclude is happening to explain this difference?

2007-09-12 16:56:36 · 3 answers · asked by corvetteracing 1

Show that the system

x1 + x2 + x3 = y1
2*x1 + 3*x2 + x3 = y2
3*x1 + 5*x2 + x3 = y3

has an infinite number of solutions, provided that (y1, y2, y3) lies on the plane whose equation is y1 - 2*y2 + y3 =0.

2007-09-12 16:53:40 · 2 answers · asked by nevrforget787 1

Find the equation of the tangent line to the curve f(x)=(4/x)-x at the point where x=1

2007-09-12 16:45:12 · 4 answers · asked by whoo_kidd1 1

i have a math problem and i can't figure it out



im a integer the difference between me and 10 is the same difference between me and 6 what am i

2007-09-12 16:35:25 · 4 answers · asked by jjtakia66 2

I want to be shown step by step.

2007-09-12 16:29:43 · 5 answers · asked by Anonymous

Factor each polynomial by grouping the first two terms and the last two terms. x^3-4x^2+2x-8

2007-09-12 16:16:55 · 4 answers · asked by Anonymous

2007-09-12 16:14:45 · 12 answers · asked by Anonymous

2007-09-12 16:14:36 · 4 answers · asked by Anonymous

2007-09-12 16:09:35 · 2 answers · asked by Anonymous

How do i use the definition of the derivititve to find f(x)= x + sqrt (x)

2007-09-12 16:05:50 · 3 answers · asked by Christine N 1

Express 74.26' in degrees, minutes, and seconds to the nearest second

The answer is 74 degrees, 15 minutes, 36 seconds but I don't know how to get to there

2007-09-12 16:02:25 · 5 answers · asked by Anonymous