Mathematics - 31 December 2007

If I get one wrong can you tell me the right answer and maybe the steps you took to get there, thank you.

GIVE EACH ABSOLUTE VALUE

i= imaginary number
I...I absolute value brackets

1.
I 8 - 6i I
A: square root of 28

2.
I -1 I
A: 1

3. I -12 + 22.5i I
A: square root of 362.25

4.
I 19i I
A: 19

ADD EACH PAIR OF COMPLEX NUMBERS

5. ( 2 + i ) + (-3 + 2i)
A: -1 + 3i

6.
( -5 + 4i ) + 3
A: -2 + 4i

7.
( 6 - 3i ) + ( -4 - 2i )
A: 2 + 5i

GIVE EACH ABSOLUTE VALUE

8.
I 15 + 7i I
A: square root of 274

9.
I -2 - 6i I
A: 2i times the square root of 10

10.
I square root of 8 - i times the square root of 4 I
A: Can you show me the steps on how you got this one, thx

11.
I 0.2 + 0.8i I
A: square root of .68

12.
I -14 I
A: 14

13.
I -3.6i I
A: 3.6

14.
I 20 + 21i I
A: 29

15. I -30 - 5.5i I
A: 30.5

ADD EACH PAIR OF COMPLEX NUMBERS

16.
( 3i ) + ( 8 )
A: 3i + 8

17.
( -4 - 3i ) + ( 2 - 2i )
A: -2 - 5i

18.
( 3 + 3i ) + ( 3 - 3i)
A: 6

19.
( 2 + 3i ) + ( 3 + 2i )
A: 5 + 5i

2007-12-31 06:38:00 · 3 answers · asked by Anonymous

X = 2, 3i, -3i

I don't know what I'm susposed to do.

2007-12-31 06:25:57 · 6 answers · asked by Anonymous

1. Replace the ? with a polynomial to make a true statement:
2x^-2 +x^-1 -3 =x^-2 (?)


2. Write in decimal form: 10 ^-4

a) 1,000
b) 100
c)0.00001
d) 0.0001

With question no.2 is there something wrong with the no. of zeros in the multiple choice or is it just me?


Thank you for your help.

2007-12-31 06:13:26 · 3 answers · asked by Noname 2

The idea of numbers being in a loop has always interested me. I first began thinking about this when trying to understand tan90 as when it appraches from the left it tends towards positive infinity and as it approoaches from the right it tends towards negative infinity. I know my hypothesis is totally abstract but then again is infinity itself and mathematics in general abstract. This notion first began when reading about a closed universe and thought that if it is theoretical for a universe to be closed why not the number system that defines it. I imagine the numbers zero and positive/negative infinity as being different poles on a sphere. where positive infinity and negative infinity are a whole circumference apart from each other but are also at the same point.

2007-12-31 05:54:03 · 13 answers · asked by Anonymous

what kind of number am i?
clue 1- i am a real number whose value is less than 1
clue 2- i do not end
clue 3- my digits do not repeat

2007-12-31 05:48:56 · 8 answers · asked by avatar 1

explain, is this best described by a linear function or a non-linear function. Explain your reasoning.

a. The time it takes you to get to work as a function the speed at which you drive

b. The probability of getting into a car accident as a function of the speed at which you drive

c. A person's height as a function of the person's age (from age 0 to 100)

2007-12-31 05:43:08 · 4 answers · asked by John J B 1

write an equation for f (x) from the table below

x -2 -1 0 1 2
f(x) -5 -2 1 4 7

2007-12-31 05:36:49 · 7 answers · asked by John J B 1

If a certain six digit number is split into two parts, one constituting the first three digits and the other the last three digits, and the two parts are added and the resulting sum squared, it is found that the product is the original six-digit number. What is the number?

2007-12-31 05:26:22 · 5 answers · asked by Anonymous

tell me how you got the answer. show work

2007-12-31 05:21:40 · 30 answers · asked by avatar 1

2007-12-31 04:59:55 · 15 answers · asked by Will S 1

Given two vectors and an angle between them greater than 25deg, find the vector between them that is at a 25 degree angle from the first given vector.

Cheers.

2007-12-31 04:58:34 · 1 answers · asked by Torontonian1978 2

I'm trying to print out all 1000 combos of 3 digits so I can open my briefcase lock. Can someone show me the excel formula to do so?

Thanks!

2007-12-31 04:31:34 · 6 answers · asked by Anonymous

A.10 TO THE POWER OF -4=10,000
B.10 TO THE POWER OF -4= -0.0001
C.10 TO THE POWER OF -4= 0.0001
D.10 TO THE POWER OF -4= -10,000

2007-12-31 04:30:56 · 12 answers · asked by Anonymous

I want to find out how much money it will cost [in gas ] to drive 20.22 miles exactly. That is going one way, so I need to know how much it will cost both ways, with the gas price being ( at the highest ) $ 3.35.

So gas price: $ 3.35
Distance: 20.22 Miles One Way
Distance: 40.44 Miles Both Ways


How much will it cost to go to this place in all?

I really don't know how to do this and it has nothing to do with math homework. I need to find the price to volunteer at an animal shelter every weekend to see if I can afford to pay the person driving me.

2007-12-31 04:29:08 · 6 answers · asked by Anonymous

The question ask me to convert 35.78° into radian. But I don't know how to convert it. Can i just round the number into 36° and solve it??? Please help!!!

2007-12-31 04:26:08 · 7 answers · asked by Anonymous

70% of the students in the class do homewok three or more nights each week. Of the students who do homework three or more nights each week, half do homework five nights each week.

A. What fraction of the students in the class do homework five nights each week? Explain you reasoning.

B. What percantage of students in the class do homework. three or four nights a week? Explain your reasoning.

C. From the information provided, can you tell how many students are in the class? Explain why or why not.

2007-12-31 04:23:27 · 2 answers · asked by Anonymous

the formula x(t)=lnt + (t^2/18) + 1 gives the position of an object moving along the x-axis during the time interval 1 ≤t ≤ 5. At the instant when the acceleration of the object is zero, the velocity is
a)0
b)1/3
c)2/3
d)1
e)undefined

2007-12-31 04:19:49 · 9 answers · asked by affy 2

Help? I know its a double angle equation, but none of the formulas seem to get the correct answer. The only instructions are to find the exact solutions of the equation in the interval [0,2pi)

2007-12-31 04:13:47 · 6 answers · asked by em.four 2

2007-12-31 04:10:19 · 12 answers · asked by Anonymous

How do you solve for X in matrixes?

For example please explain how ([-2x 11] - ([-13 -12]) + [ 0 17] = [23 28 ]


Please explain and give answer and you'll get best answer!

2007-12-31 04:07:38 · 2 answers · asked by Jaz 'ma' Taz 2

Today I answered a simple problem of trigonometry and was the first to solve it. But someone had just posted the question only as an answer before me and edited it with the answer after seeing my answer. Now it appears that he was the first to solve. What should be done to discourage such an unethical practice?

2007-12-31 04:06:32 · 7 answers · asked by Madhukar 7

A.x=3
B.x= -75
C.x= -13
D.x= 35

2007-12-31 04:05:25 · 8 answers · asked by Anonymous

A.x= -144
B.x= -336
C.x= -7/3
D.x= -1

2007-12-31 03:49:49 · 12 answers · asked by Anonymous

I've tried substituting secA for 1/cosA but not really getting anywhere. Answer is supposed to be 17.5, but I have no idea how to get there! Any help would be much appreciated.

2007-12-31 03:45:54 · 5 answers · asked by Anonymous

you must use all four numbers. For example, the numbers 5, 5, 8, 8 can equal 24 as follows: 5*5-8/8
also, reversed order only counts as one
I already have one. (3/7+3)*7
can anyone think of any others

2007-12-31 03:41:13 · 3 answers · asked by Anonymous

2007-12-31 03:29:15 · 6 answers · asked by Wallace 2

math WAS my best subject in school. but i am really drawing a blank here. what is one-half of two-thirds? and could you please explain how you get the answer?!! thanks

2007-12-31 03:28:21 · 11 answers · asked by stevies_mom 3

If you could list a website as a reference that would be nice.

2007-12-31 03:09:03 · 7 answers · asked by ? 2

Another way to formulate the same question is: is there any technical name for what only numbers 1, 4, 27, 256, 3125 etc. are?

2007-12-31 03:05:04 · 5 answers · asked by Nh4ClO4 2

Outta curiousity, asymptotes are values that a curve approaches, but never meet the curve at those lines, but in curves like

f(x) = 1 + (x / x^2 +1)


they cross the asymptote heaps of times xD, why's that?

The horizontal asymptote is y= 1, and yet thats its axis intercept...

Is there a special case with horizontal asymptotes?

And can a curve cross its verticle asymptotes?

I guarentee there is some retarded curve out there xD But why can it cross, they aint meant to touch each! =S

2007-12-31 03:00:43 · 4 answers · asked by Suki 4