Mathematics - 3 October 2006

Consider the matrix B =
1; -2; 1
3; 4; 1
6; -2; 4
(a) Find out if the columns of B are independent.
(b) Are the rows of B dependent?
(c) Suppose that Bu = Bv. Does it follow that u = v? Why or why not?

2006-10-03 14:45:35 · 3 answers · asked by Amir E 1

2006-10-03 14:39:37 · 28 answers · asked by hdrinko1@sbcglobal.net 1

A serving tray made of brass weighs 21 ounces. This brass is an alloy of 70% copper and 30% tin. What is the weight of the copper tray?

2006-10-03 14:32:45 · 8 answers · asked by Nerds Rule! 6

...three equilateral triangles inside an octagon?

2006-10-03 14:28:24 · 5 answers · asked by Heckel 3

Say whether each of the following statements is true or false, and give a brief reason in each case.
(a) Every system of 3 linear equations in 5 unknowns has many solutions.
(b) If a system Cx = b has a solution x, then the columns of C are dependent.
(c) If two matrices D and E reduce to the same echelon form then D = E.

2006-10-03 14:25:20 · 3 answers · asked by Amir E 1

By September a major league baseball team had won 77 games and had lost 63 games. What was its percentage of games won?

Thank-you to the people who answer!

2006-10-03 14:15:40 · 11 answers · asked by Nerds Rule! 6

geometry

2006-10-03 14:12:37 · 5 answers · asked by Anonymous

2006-10-03 14:10:43 · 9 answers · asked by Anonymous

find two numbers which have a difference of 7 and a product that is a minimum

how do you solve this ? what does it mean when it says a product that is a minimum?

2006-10-03 13:59:01 · 4 answers · asked by ♥ 2

2006-10-03 13:57:59 · 3 answers · asked by jwillsurvive05 1

what is the sum of the first 100 even numbers
what is the sum of the first 100 odd numbers

if you have a 6 gallon and 10 gallon jug
and u need to make 8 gallons and there are not lables sayin how much is what, " so you cant pour out 2 gallons from the jug with 10 gallons"

2006-10-03 13:51:57 · 6 answers · asked by bestpader_07 2

Find the equation of the tangent line to the given function at the given point. Show all work.

2006-10-03 13:51:04 · 5 answers · asked by Anonymous

2006-10-03 13:47:31 · 11 answers · asked by kpapadop007 2

Any formulas?

2006-10-03 13:46:53 · 12 answers · asked by Anonymous

I need you to tell me how to get it. you can give the answer too for me to check, but mostly i need to know how to get the problem.

ok....
The directions are
First draw a diagram. Then answer the question.

43) If sin angle A = 3/5 and cos angle A = 4/5 what is the tan of angle A?

Thank you

remeber. tell me how to get the answer. Thankx

2006-10-03 13:45:55 · 6 answers · asked by Horse Lover 2

In Geometry Postulates don't have to proven, but theorems do. Theorems can be proven by other theorems, defined terms, and undefined terms. This is exactly like evolutionism and Creationism, isn't it? Evolutionism is a postulate, there is no proof for it. Creationism has tons of proof backing it up, making it a theorem. Why do people agree with something that has no proof instead of something that has 6,000 years behind it to back it up.

2006-10-03 13:41:02 · 3 answers · asked by charity 2

permutation mapping problem:


Two permutations a and b are said to be disjoint, if a(i) not equal to i implies that b(i) = i, and, b(j) not equal to j implies that a(j) = j. prove that disjoint permutations commute with one another.

thank you.

2006-10-03 13:39:32 · 3 answers · asked by David F 2

2006-10-03 13:30:53 · 11 answers · asked by Cantbestopped91 2

2006-10-03 13:27:24 · 5 answers · asked by hockeyhunny2 2

2006-10-03 13:17:23 · 7 answers · asked by Cantbestopped91 2

2006-10-03 13:16:56 · 1 answers · asked by kqandrich 1

For anyone good at math, lets see who can figure this out.

^- denotes to the power of.

X^n+Y^n=Z^n

Good luck!

2006-10-03 13:16:52 · 10 answers · asked by Anonymous

2006-10-03 13:11:42 · 7 answers · asked by chuckster 2

2006-10-03 13:11:04 · 5 answers · asked by nap-prod@sbcglobal.net 1

mandy gets her hair cut every 4 weeks and eric gets his hair cut every 5 weeks and nick gets his every 7 weeks. If they all got their hair cut on the same day, when will they get their har cut on the same day again (in weeks)?

2006-10-03 13:07:17 · 11 answers · asked by killy 2

explain too please.

2006-10-03 13:07:07 · 2 answers · asked by Anonymous

Rational self-interest implies that ?

a) individuals make choices that provide them with the greatest satisfaction.

b) individuals are selfish.

c) individuals consider themselves better off when they take actions that make others worse off.


D)
individuals have studied economics.
all other variables are held constant.

2006-10-03 13:05:38 · 2 answers · asked by Olivia 4

the answer should be woth formulas

2006-10-03 12:50:17 · 3 answers · asked by sania s 1

and (3a+b)+2c=2c+(3a+b)

2006-10-03 12:49:52 · 3 answers · asked by hjkhkkh l 1

I don't know how to explain this but I'll try.

The sides of a triangle are 4 ft (left side), 6.4 ft (right side) and 5.6 ft (bottom). And then on the inside the angles are 82, 60, and 38. The question asks what is wrong with the "labels" on the kitchen triangle (because the problem is a "kitchen triangle" located in where else but a kitchen.... dur.)

I could be wrong, but I think the answer is the triangle is wrong because perimiter of a triangle is supposed to add up to 180 but in this problem it adds up to 160. Am I right? Someone please help me!

2006-10-03 12:45:01 · 4 answers · asked by Sarah . 1