Mathematics - 13 August 2007

Alright, so, I'm a freshman in college this year, and I'm majoring in math, but I have a question. What applications to real life does an imaginary number have? I've always found reasons for all of the other types of math, even if I don't use them, but imaginary numbers just seem useless and bizzare. Can anyone give me a situation, or even a story problem that can give a possible (even if not likely) situation in which you would need to use an imaginary number?

2007-08-13 13:17:57 · 7 answers · asked by Anonymous

Okay, the problem is:

Stefan polled 113 student about the number of siblings they have. Use the table to compare the probability that a student has no siblings to the probability that a student has three siblings.

The table shows that the number of students that had 0 siblings is 14 and the number of students that had 3 siblings is 15. So, what I'm doing is dividing 14 by 29 and 15 by 29, to find out the probability for each and they come up with really large decimals. Am I doing something wrong?

2007-08-13 13:02:17 · 8 answers · asked by Anonymous

Why are logarithmic scales used when measuring sound intensity, pH levels, and earthquakes?

2007-08-13 12:56:56 · 1 answers · asked by Anonymous

Solve the equation 7a^2 + 12a - 11 = 0, giving your answer to two decimal places.

2007-08-13 12:54:11 · 3 answers · asked by Anonymous

Referring to the figure, simplify the expression if possible and write your answer as a power (using exponents).
1.(6 x 7)^2
2.(4xy^2)^2
Referring to the figure, evaluate the expression when b=2.
3.b^3 x b^4
evaluate the expression when a=1.
4.(a^2)^3

2007-08-13 12:53:16 · 7 answers · asked by Berry A 2

1) LM = 3x+8
MN= 2x-5
LN= 23

2) LM= 7y+9
MN- 3y+4
LN=143

3) LM= 1/2z +2
MN= 3z + 3/2
LN = 5z +2

2007-08-13 12:43:53 · 3 answers · asked by Anonymous

An artillery shell is launched on a flat, horizontal field at an angle of α = 33.8° with respect to the horizontal and with an initial speed of v0 = 256 m/s. What is the horizontal distance covered by the shell after 5.10 s of flight?
1.08×103 m (in m) answer
What is the height of the shell at this moment?
5.99×102 m (in m) answer

i know the answer but could someone show me how to work this out...need to study for final...thanks

2007-08-13 12:42:37 · 2 answers · asked by Anonymous

if a single die (number cube) is rolled 300 times, how many times is a number greater than 3 expected to come up?

2007-08-13 12:42:10 · 10 answers · asked by Megan 3

2007-08-13 12:33:39 · 1 answers · asked by bigennice5 1

if you can help me more is it the same as antilog!

2007-08-13 12:30:21 · 2 answers · asked by kilin_jok 3

x^2 +xy + y^2 = 27

I did this and got.. (-(2x + y))/(x+2y)

but i saw this same question on yahoo answers.. and the person said it's positive..
(2x+y)/(x+2y)
soo which is right?

Thanks!

2007-08-13 12:26:48 · 4 answers · asked by Anonymous

2007-08-13 12:19:04 · 5 answers · asked by melissa 1

How do u calculate this one???
2^0,33

and how do u calculate negative numbers like this one

2^-3 or 2^-33

Can u show me how u did it??

Thank you very much

2007-08-13 12:17:28 · 2 answers · asked by Anonymous

K, i need help simplifying this expression...

4x - (2-3x) + 5

what method do i use and how?

2007-08-13 12:08:47 · 13 answers · asked by Anonymous

2007-08-13 12:07:57 · 5 answers · asked by rachel z 1

4 / 6x-1/=29

the / means absolute value

2007-08-13 11:56:08 · 6 answers · asked by Anonymous

a)Evaluate y at x = -2, -1, 0 , 1, 2, 3, 4

b) according to that curve`s equation. What are the solutions to the following equations:

X^2 – 2x – 3 = 0
X^2 – 2x – 3 = x
X^3 – 2x – 3 = -2



c) what is the minimum value of x^2 – 2x – 3 ?

2007-08-13 11:37:29 · 7 answers · asked by Anonymous

Ax +By = C

what do they stand for??????????

2007-08-13 11:34:26 · 4 answers · asked by mikey t 2

2007-08-13 11:33:05 · 9 answers · asked by Anonymous

2007-08-13 11:12:00 · 13 answers · asked by R D 2

Find RS. Find QS. Find TS. Find TV

2007-08-13 11:10:01 · 2 answers · asked by Anonymous

1) 2x^2 / x^3

2) sqaure root (then inside that) x^4

3) 2x + 4 / 2

2007-08-13 11:06:58 · 7 answers · asked by Anonymous

1.Find the first quartile of the data: 6, 10, 1, 8, 3, 1, 4
2.Find the second quartile of the data: 6, 10, 1, 8, 3, 1, 4
3.Find the third quartile of the data: 5, 10, 1, 8, 3, 1, 4

2007-08-13 11:05:01 · 1 answers · asked by Berry A 2

Can someone help me with these problems because im like lost.

1.) 4(x +5)=6(2x -1)

2.) 2x + 3 = x -7

3.) 2/5 x + 7=13

2007-08-13 10:56:20 · 7 answers · asked by fizzphattygurl34 1

graph and find the inverse function and its graph
for precalcaulus

2007-08-13 10:50:30 · 2 answers · asked by Anonymous

what do you call a math problem that uses things like x+5-2(8-4).stuff like that

2007-08-13 10:40:01 · 13 answers · asked by livelifelikealibra 3

2007-08-13 10:37:36 · 4 answers · asked by Alexander 6

2007-08-13 10:35:26 · 4 answers · asked by mockin 1

write an equation for the line that is parallel to -7x -3y = 3 and that passes through the point (9,-7)

2007-08-13 10:17:17 · 7 answers · asked by Anonymous

answer should be x=1

2007-08-13 10:08:59 · 7 answers · asked by G S 1