Mathematics - 20 October 2007

2x^4 + 11x^3 + x^2 – 10x - 4
-what are possible rational roots?
-Actual rational roots?
-Other real roots?
-Divide by (x-r) where r is a root. Repeat with as many roots as you know. Can you find the other roots?

2007-10-20 16:35:08 · 5 answers · asked by ? 3

im having trouble understanding this? sqrt 10 x sqrt 20
and like sqrt 63 can someone explain how you solve these step by step and explain more on sqrts...

2007-10-20 16:33:33 · 6 answers · asked by Anonymous

2007-10-20 16:32:56 · 22 answers · asked by atifali_77 2

For example: (999 / 9) - 9 = 102 (but you must get 100, not 102!!!)

2007-10-20 16:18:05 · 4 answers · asked by JhoodFlowz 1

then how large must n be to be certain that Pn(0.2) approximates e^0.2 accurate to 6 decimal places.
Thanks
Dave

2007-10-20 16:06:34 · 1 answers · asked by Anonymous

sq. rt. (8+6i)(6i-8)

2007-10-20 16:01:13 · 6 answers · asked by amy f 1

2007-10-20 15:49:36 · 3 answers · asked by Anonymous

Using the graph of y=x^2+4x-5,
1)what are the solutions to the equations x^2+4x-5=0?
and 2)equation of line of symmetry for this?

2007-10-20 15:49:05 · 2 answers · asked by Moe 1

i have to solve this and in the answers it says x=0 x=-4
how???

2007-10-20 15:23:19 · 8 answers · asked by Anonymous

2007-10-20 15:17:48 · 7 answers · asked by yanksrule4691 1

How do you find the length of the side of the square, when the square is inscribed in a right triangle. solve in terms of a, x and b . a and b are sides of the right triangle. x is the length of the side.

(it'd be better if i could draw a picture but i cant. :/)

2007-10-20 15:17:28 · 7 answers · asked by Anonymous

a over 3 + 2a over 5. Do I cross multiply? Please help me.

Thank you.

2007-10-20 15:14:49 · 6 answers · asked by Kevin G 2

Can someone please help me with this problem. Thank you.

2007-10-20 15:12:05 · 8 answers · asked by Kevin G 2

state answer as an ordered pair (x,y)

1. x+y=1
y=(2/3)x-4

2. Is this ordered pair (5.3, 1.2) a solution to the system?
x+2y=1
x-3y>=0
yes or no?

3. Fill in the blank with correct word
In systems of equations, solving one equation for a variable and plugging that expression into another equation is known as the what method?

4. Solve the following system of equations. WHat is the value of a?
3a-5b=10
a+7b=12
a)a=5
b)a=79/13
c)a=1
d) none of these

5.) Solve the following systems of equations. Describe the graph without graphing.
3x-2y=24
6x-4y=-6
a)two intersecting lines-solution in quadrant 1
b)two intersecting lines-solution in quadrant 3
c)two parallel lines-no solution
d)coincidental lines-many solutions

6. Describe the graph without graphing.
a+b=10
3a+2b=40
a)two intersecting lines-solution in quadrant 2
b)two intersecting lines-solution in quadrant 4
c)two parallel lines-no solution
d)coincidental lines-many solutions

2007-10-20 14:59:08 · 3 answers · asked by Anonymous

2007-10-20 14:56:28 · 5 answers · asked by Omair C 1

square route of 75 over square route of 3

2007-10-20 14:53:04 · 8 answers · asked by yanksrule4691 1

3y^2+ 4v-1=0

2007-10-20 14:29:35 · 6 answers · asked by mormar 1

I have 2 F's, 1 B, 2 A's, and 1 D.

And also, what would it be after i changed one of the F's to a C?

2007-10-20 14:08:50 · 7 answers · asked by Lovely 1

can u list step by step for me..thank-you

2007-10-20 13:57:04 · 3 answers · asked by itsallgood861 1

Prove: If A is a subset of B, then A union C is a subset of B union C.

My first inclination was to do a direct proof. But all I ended up doing was defining the initial subset.

Let x be any object.
Suppose A subset B.
Then x is an element of A implies x is an element of B.

Where should I go from there?

I also tried to work backward from the consequent, but got lost in the four different combinations of A U C subset B U C.

I don't think contradiction would work, either.

Please, I need suggestions or help getting on the right track.

Thanks

2007-10-20 13:54:19 · 2 answers · asked by Tati 2

If you could answer any of these that would be great..
A: If you spend a million dollers a day, how many years would it take to spend one mole of dollars?
B: How many moles of pencil marks can can you make in one minute?
C: If the surface area of the Pacific Ocean is 1.6576x10>8 sq. km and the average depth is 4,028 meters, how many moles of water are in the pacific? (Hint: 18cm>3 = 1mole water)
D: If the average penny is 2mm thick, how far toward the sun would a 1 mole stack of pennies reach?

2007-10-20 13:44:47 · 2 answers · asked by EM 2

I have a question that requires me to "write the inverse of matrix A as a product of 4 elementary matrices" How would I go about doing this? I have already written A as a product of elementary matrices does this help at all?

2007-10-20 13:43:25 · 3 answers · asked by Bikki 3

2007-10-20 13:39:19 · 13 answers · asked by wats2004 2

2007-10-20 13:32:50 · 9 answers · asked by Anonymous

t^2/3 + t^1/3 - 6 = 0

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:30:42 · 6 answers · asked by Anonymous

x^2 + 6x = 7

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:29:11 · 14 answers · asked by Anonymous

A rectangular class seats 72 students. If the seats were arranged with 3 more seats in each row, the class would have 2 fewer rows. Find the original number of seats in each row.

How many liters of water must be added to 20 L of a 24% salt solution to make an 8% salt solution?

Two planes leave simultaneously from the same airport, one flying due north and the other flying due east. The northbound plane is flying 50 mi/hr faster than the eastbound plane. After 3 hours, the planes are 2440 miles apart. Find the speed of each plane.

Before you yell at me to do my own homework, keep in mind that I already did attempted these problems. These are the only three problems I keep missing on my math homework. Any help would be appreciated. There is no need to give me the answers, but it'll be helpful if you point me in the right direction.

2007-10-20 13:29:01 · 3 answers · asked by xılǝɥ ⋆ 5

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:27:43 · 5 answers · asked by Anonymous

5 - i / -7 + 2i

I think the i's mean imaginary numbers or something.
Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:26:52 · 3 answers · asked by Anonymous

how long is 5 km/hr for 15 minutes?

the answer needs to be in kilometers. please show how you figured out your answer. thanks in advance :)

2007-10-20 13:21:38 · 7 answers · asked by skateme1 2