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Algebra: Complex Numbers

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Question 94394: How do I get this formula to read with the r on the left hand side reading r = ???????
V = 1/3 3.142 r2 h
I really would love some help. Thank you oh so much.
Click here to see answer by ankor@dixie-net.com(6692)

Question 94446: Solve by writing an inequality. Please help me find the lesser of two consecutive integers with a sum greater than 16.
Click here to see answer by ankor@dixie-net.com(6692)

Question 94510: I am desperate to know if I am doing this correctly. Would you please let me know how I am going? Thank you so much.
a=2, b=3, c=-4, d=-1, e=0
–
–
(2/3) (2/3) - (-4/-1) (-4/-1) (-4/-1)
2/3*2/3 – 4*4*4
(2*3) (3*2)/3*3 – 64
6*6/9 – 64
36/9 - 64
4 – 64
= - 60

Click here to see answer by Earlsdon(4898)

Question 94445: Solve by writing an inequality. The length of a picture frame is 3 in. greater than the width. The perimeter is less than 52 in. Please help me describe the dimensions of the frame.
Click here to see answer by checkley71(8405)

Question 94393: Please help if a=2, b=3, c=-4, d=-1 and e=0
(a/b)^2 - (c/d)^3
As I have no idea how to use fractions and exponents.
Thank you so very much
Click here to see answer by checkley71(8405)

Question 94817: I have a worded problem that is giving me trouble and I would really appreciate if someone could assist me in making sense of it all. It goes like this.
Four brothers are born in successive intervals of three years. The eldest is twice the age of the youngest. What is the age of their father, who is eighteen years older than the eldest son?
I have given this a go, but all I am able to come up with is this
B1= Brother 1 =9
B2= Brother 2 =12
B3=Brother 3 =15
B4=Brother 4 =18
F=Father =36
B1+B2+3+B3+6B4+9
4B=+18
F=2B4+9
My problem is even though I think I can get an answer to this problem in my head. I am unable to sort it into an algebraic equation, which is what I desperately need. Any help would be greatly appreciated. Thank you so much.
Click here to see answer by ankor@dixie-net.com(6692)

Question 95103: Hi can you help me with the following problem?
Write the answer in standard form of scientific notation correctly rounded to 2 figures.
(5.46 x 10^-8) ( 9.77 x 10^-8)
______________________________
(4.07 x 10^3) ( 8.37 x 10^3)
Thanks.
:)
Click here to see answer by checkley71(8405)

Question 95093: Hi. i WAS WONDEIRNG IF YOU COULD HELP ME WITH THE PROBLEM:
Write the answer in standard form of scientific notation correctly rounded to two figures.
(8.69 x 10^-9) (5.20 x 10^6)
____________________________
(9.54 x 10^1) (3.87 x 10^-1)
Thanks.

Click here to see answer by stanbon(26259)

Question 95304: Hi can you help me with the following problem?
Write the answer in standard form of scientific notation correctly rounded to 2 figures.
(9.79 x 10^2) ( 4.06 x 10^-7)
______________________________
(8.33 x 10^-7) ( 2.59 x 10^4)
Thanks.
:).

Click here to see answer by checkley71(8405)

Question 94892: A student claims that the equation 5x = 4x is a contradiction, since dividing both sides by x leads to 5 = 4, a false statement. Explain why the student is incorrect.
Click here to see answer by bucky(1732)

Question 95502: Solve the equation in the complex number system.
x^3-8=0
This one is stumping me. It doesn't appear that it can be factored out so I tried to use (x-1)=(x^2+X+8). I still can not come up with an answer. Any help would be greatly appreciated.
Click here to see answer by stanbon(26259)

Question 95483: Please help me with this problem.
Find a quadratic function with solutions -5+2i and -5-2i and a leading coefficient of 1.
Click here to see answer by scott8148(3382)

Question 95588: I'm sorry! Can you help me this problems. I have been study about Complex Numbers i just studying at hight scholl .But i can't find this problem so i want you help me in this 2+3i, 4+3i,in form r(cosQ^+isinQ^).Thank you.
Click here to see answer by stanbon(26259)

Question 96351: how many newspaper does quang delliver in 4 days if he delivers4'200 in three week period[21days]
Click here to see answer by checkley71(8405)

Question 96475This question is from textbook College Algebra

: The problem is i to the -10th power. I don't even know how to begin to start. The example in the book of i to the -3rd=i to the -4 x i and I don't understand why. Can you give me another example that might work like this one?This question is from textbook College Algebra

Click here to see answer by longjonsilver(2297)

Question 96495: I have a problem that asks me to find the one real zero and two complex zeros. I just do not know where to even begin and our book has no examples of it. Here is the problem: 2x^3+17x^2+120x+225 Thank you so much!
Click here to see answer by jim_thompson5910(13787)

Question 96685This question is from textbook glen coe

: y=-3x+4This question is from textbook glen coe

Click here to see answer by checkley71(8405)

Question 96726: Hi! I have no clue as to how to solve, . Could you please help me?
Click here to see answer by scott8148(3382)

Question 97238This question is from textbook College Math

: ^4 square root 5x-4=2This question is from textbook College Math

Click here to see answer by Nate(3495)

Question 97300This question is from textbook College Math

: Square root 15-2x=xThis question is from textbook College Math

Click here to see answer by stanbon(26259)

Question 97303This question is from textbook College Math

: square root 2x+3 - square root x+1 =1This question is from textbook College Math

Click here to see answer by mathslover(126)

Question 97314: I need help with complex numbers. The problems are 5+6/2+i, x^2-8x+28=0. Thank you because my professor is a real bag!
Click here to see answer by jim_thompson5910(13787)

Question 97665This question is from textbook Algebra 2 An Incremental Development
: -2^3-1/-2^-2(x+2)-3x=-2^0(-2x^0-4)
This is how I worked it out at one point but I cant get to seem to get to the answer of 6 (which is in the back of the book) Im confused, I though I understood these.
-8-4x-8-3x=1+4
-16-7x=5
+16 +16
___ ___
0 21
-7x=21
This question is from textbook Algebra 2 An Incremental Development

Click here to see answer by stanbon(26259)

Question 98149: i square root negative 175
Click here to see answer by mathslover(126)

Question 98338This question is from textbook college algebra
: How do I solve: (square root -6) - (square root -2)?This question is from textbook college algebra

Click here to see answer by stanbon(26259)

Question 98341This question is from textbook college algebra
: How do I use the quadratic formula to solve: 1.4x^2-2x-10=0 This question is from textbook college algebra

Click here to see answer by checkley71(8405)

Question 98340This question is from textbook college algebra
: How do I solve: 3/2x^2-6x+9=0This question is from textbook college algebra

Click here to see answer by checkley71(8405)

Question 98339This question is from textbook college algebra
: How do I solve: (3+square root -5)(7-square root -10)?This question is from textbook college algebra

Click here to see answer by checkley71(8405)

Question 98337This question is from textbook college algebra
: How do I solve (square root 14+square root 10i)(square root 14-square root 10i)?This question is from textbook college algebra

Click here to see answer by checkley71(8405)

Question 98546: the two longest sides of a pentagon are each three times as long as the shortest side. the other sides are each 8 meters longer than the shortest side. find the length of each side if the perimeter is 79 meters.
Click here to see answer by stanbon(26259)

Question 98663: Differentiate with respect to θ
f(θ) = sin(5θ – 2)
Click here to see answer by stanbon(26259)

Question 98665: Differentiate with respect to theta
f(θ) = 7sin^2(1 - 5θ)
Click here to see answer by Edwin McCravy(2920)

Question 98770: how would I solve"
1/2x+2
x=2
Click here to see answer by elima(1433)

Question 99082: Obtain derivative of f(t) = In(5 – 2/3t)
Click here to see answer by Adam(63)

Question 99092: How can I answer this question? Please help me.
3: True or False? Explain your answer.
2 - √-6 = 2 - 6i

Click here to see answer by stanbon(26259)

Question 99092: How can I answer this question? Please help me.
3: True or False? Explain your answer.
2 - √-6 = 2 - 6i

Click here to see answer by Adam(63)

Question 99744: Hello, I have a few problems on complex numbers that I don't understand how to solve them. Could you please help me on these problems? Thank you very much.
problem 1: 3/sqrt2-5i (i is for imaginary number)
problem 2: divide (1+i) by (2-i). Write the result in standard form. (i is for imaginary number)
problem 3: perform the operation and write the result in standard form: (5-sqrt4)^2

Thank you again,
Kumi
Click here to see answer by stanbon(26259)

Question 99855: Hello I was wondering if you could help me on this problem?
Simplify. (i is for imaginary number.)
(3-6i)/(-4i)
Thank you,
Kumi
Click here to see answer by stanbon(26259)

Question 100060: given the following two complex numbers, a=3+7i and b=-2-2i,calculate the following
a+b
a-b
a*b
a/b
Click here to see answer by edjones(3292)

Question 100060: given the following two complex numbers, a=3+7i and b=-2-2i,calculate the following
a+b
a-b
a*b
a/b
Click here to see answer by timmy1729(23)

Question 100681This question is from textbook algebra and trigonometry Larson hostetler
: -2(x^2 - 3)^-3(2x)(x + 1)^3 - 3(x + 1)^2(x^2 - 3)^-2
______________________________________________________
[(x + 1)^3]^2
how do i simplify this expression?
so far, i got:

(x^2 - 3)^-3[(x^2 - 3)^1 - 2(2x)(x + 1)^2]
___________________________________________
[(x + 1)^3]^2

(x^2 - 3)^-3[(x^2 - 3) - 4x]
______________________________
(x + 1)^3

This question is from textbook algebra and trigonometry Larson hostetler

Click here to see answer by stanbon(26259)

Question 100897: The problem is .2 (x-5)=x+5. What I did below I'm not sure if it's correct.
.2(x-5)=x +5
.2x-1=x+5
.2x=x+6
x=6
Click here to see answer by diamonddarby2(3)

Question 100973: Please help me solve.
i+i2+i3+i4+i5= ?
Click here to see answer by edjones(3292)

Question 100898: 2/5 (x-2)=X+4
I got 2x/5-4/5=x+4 and I'm not sure what to do next because of the fractions

Click here to see answer by scott8148(3382)

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