Questions on Algebra: Complex Numbers answered by real tutors!

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Question 110454: I am absolutely speechless with this problem. I have asked everyone I know and looked for help and nothing. Please help me.
The problem is:
V=(pi)R^2h-(pi)r^2h Solve for r^2
Click here to see answer by stanbon(57224)

Question 110586: Someone invested $24,00 at 8% and the rest at 7.2%. How much did they invest at each same rate if their income from 8% is 2/3 that of 7.2%
Click here to see answer by josmiceli(9650)

Question 110653: Graph the system and solve: y=2^(x-4) +1
and y=2sqrt(x)
i graphed the system but i do not know how to solve it.

Click here to see answer by josmiceli(9650)

Question 110652: Graph the system and solve: y=2^(x-4) +1
and y=2sqrt(x)
i graphed the system but i do not know how to solve it.

Click here to see answer by stanbon(57224)

Question 110761: Can you figure this out for me!
1. Factor
-9w+9u-tw-+ut
2. Factor
6b^4/5c^4d^2/3ab^3/15c^2d
3. x sqrt.80xw^2+5wsqrt.5x^3
Click here to see answer by stanbon(57224)

Question 110871: Simplify and write your answer in the standard complex form:
3 + 4i + 1 / 3 + 4i
A little stumpled here as the instructor really hasn't presented this in a way I can understand. Appreciate any assistance/guidance you can provide.

Click here to see answer by MathLover1(6614)

Question 111092: please find : absolute z+4z*
Click here to see answer by Fombitz(13828)

Question 111394: would you please solve the following equation :
xi/1-yi=3x+4i/3x+4y , where x & y are real .
thank you in advance
Click here to see answer by MathLover1(6614)

Question 111943: divide
8+2i/3+4i
Click here to see answer by jim_thompson5910(28476)

Question 112257: given that 1+3i is a zero of f(x)= x^4-2x^3+5x^2+10x-50 find all zeros and write a linear factorization
Click here to see answer by scott8148(6628)

Question 112595: Perform the indatcated operations. Write answer in the form a + bi
4 + 3i over 2 + 3i
Click here to see answer by jim_thompson5910(28476)

Question 113001: Evaluate the quadratic function y=x^2-2x+2 at x=1+i
Click here to see answer by jim_thompson5910(28476)

Question 113127: how would you work 3 - i over 2 - i
Click here to see answer by stanbon(57224)

Question 113126: help!
how would you work out 2- 4i over 1+ 3i
Click here to see answer by stanbon(57224)

Question 113450: Solve by completeting the square:

3x (squared) - 18x + 24 = 18 (not sure how to get it to type the squared
Click here to see answer by jim_thompson5910(28476)

Question 113450: Solve by completeting the square:

3x (squared) - 18x + 24 = 18 (not sure how to get it to type the squared
Click here to see answer by josmiceli(9650)

Question 113449: I need help with my sons Algebra II, it has been many years...
Solve the inequality algebraically

x 2 -3x-4 < 0 (that is x squared)
Click here to see answer by MathLover1(6614)

Question 113449: I need help with my sons Algebra II, it has been many years...
Solve the inequality algebraically

x 2 -3x-4 < 0 (that is x squared)
Click here to see answer by josmiceli(9650)

Question 113681: Subtract the complex numbers: (3 + 5i) - (1-7i).
Click here to see answer by Adam(64)

Question 113858: Perform the operation and simplify, expressing answer with a positive exonent in lowest terms: (x^2/3)(x^1/5).
Click here to see answer by edjones(7569)

Question 113906: Can I take average of a complex number and a real number?
i.e. [(a+bi)+c]/2=?
Click here to see answer by jim_thompson5910(28476)

Question 113857: Factor completely: x^2 - 8x + 16.
Click here to see answer by jim_thompson5910(28476)

Question 113856: Factor: 12a^2 + 5a - 2.
Click here to see answer by jim_thompson5910(28476)

Question 113855: Combine the complex numbers: (7-i) + (-3 + 4i).
Click here to see answer by jim_thompson5910(28476)

Question 114760: (11x-5)^2=70
Click here to see answer by jim_thompson5910(28476)

Question 113859: Solve the following: x^3 + 2x^2 = -5x
Click here to see answer by jim_thompson5910(28476)

Question 113860: Solve the equation: 2x^2 - 3x = 0
Click here to see answer by jim_thompson5910(28476)

Question 114974: Please help me with this:
Write an answer in the a = bi form
(3 + i) (2+ 3i)
Click here to see answer by HyperBrain(694)

Question 115108: Find the y-intercept,the equation of the axis of symmetry, and the x-coordinate of the vertex for f(x)=3x^2-12x+4. Then graph the function by making a table of values.
Click here to see answer by MathLover1(6614)

Question 114325: x^2+3=-24
Click here to see answer by solver91311(16868)

Question 115197: find the greatest common factor of the given numbers-
66, 144, 42
Click here to see answer by beccadancerr(1)

Question 115166: how do you solve by completing the square if your problem is: xsq-14x+1=0 ?
Click here to see answer by jim_thompson5910(28476)

Question 115215: I have been having difficulty understanding Imaginary Numbers... I was wondering if someone could explain to me the principles of Imaginary Numbers?
What is an Imaginary Number?
How do I use an Imaginary Number in an equation?
Thanks,
Erin Humphries
Click here to see answer by stanbon(57224)

Question 115354: What is the function which would intersect the y-axis 2 positions up (vertical) from the function f(x)=x^2?
Click here to see answer by stanbon(57224)

Question 115582: The volume of a sphere is given by 4/3πr^3, find the volume of a hemisphere when the diameter is 48m.
If anyone could help me with this i would be very grateful as i have been having problems with it.
Thanks
Click here to see answer by stanbon(57224)

Question 115583: The volume of a cylindrical bar is given by πr^2h find the height if the volume is 883600mm^3 and the radius is 37.5mm.
This is another complex numbers question that i have been finding difficult.
Thanks
Click here to see answer by stanbon(57224)

Question 115602: This is a worksheet that i recieved that has about six sets of 3 questions on it and i do not know how to start. Do you use the quadratic formula on them all?
A geyser sends a blast of boiling water high into the air. During the eruption, the height h (in feet) of the water t seconds after being forced our from the ground could be modeled by h= -16t^2 + 150t.
1. What is the initial velocity of the boiling water?
2. What is the maximum height of the boiling water?
3. How long is the boiling water in the air?
Please Help!
Click here to see answer by stanbon(57224)

Question 115600: I have been asked to make f the subject from the following equation: v=u+ft/m. This is the final problem that i have and would be a life saver if someone could help as my lecture has not described it correctly. Thanks
Click here to see answer by stanbon(57224)

Question 115599: I have been asked to carry out the following arithmetic operation for the following: (4-j3)(2-j4). Thanks
Click here to see answer by stanbon(57224)

Question 115613: I have been asked to carry out the arithmetic opertaion to subtract the following complex numbers:
(9+j7)-(12-j)
Would appriciate some help, thanks.
Click here to see answer by stanbon(57224)

Question 115636: I am unable to work out the following:
Find the arithmetic operation for adding the following complex numbers (4+j6)+(7-j3)+(7-j8) thanks for any help.

Click here to see answer by stanbon(57224)

Question 115790: (30-i)-(18+6i)+30i
Click here to see answer by edjones(7569)

Question 115588: Make f the subject from the following equation v=u+ft/m. If someone could help I would be grateful. thanks
Click here to see answer by ankor@dixie-net.com(15624)

Question 116121: 2x squared + 10x = -1
Click here to see answer by bucky(2189)

Question 116121: 2x squared + 10x = -1
Click here to see answer by jim_thompson5910(28476)

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