# Questions on Algebra: Complex Numbers answered by real tutors!

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 Algebra: Complex Numbers Solvers Lessons Answers archive Quiz In Depth

 Question 486108: What is the answer to the square root of negative 60 ? I've gotten this much so far, but I don't know what else to do . : Square root of negative 60 = square root of positive ten TIMES square root of positive six TIMES square root of negative one = Click here to see answer by richard1234(5390)

 Question 486215: Can you please help me? Can you give me answers to those problems and explain how to solve them? Thanks a lot!!!! 1. The inverse of a modulo 39 is b. What is the inverse of 4a modulo 39 in terms of b? 2. Let x and y be integers satisfying 41x + 53y = 12. Find the residue of x modulo 53. 3. John and Ling start their new jobs on the same day. John's schedule is 4 workdays followed by 1 day off . Ling's schedule is 7 workdays followed by 2 days off . On how many days during their first year of work (365 days) do John and Ling have the same day off ? Thank you very much!!! Click here to see answer by chessace(471)

 Question 486499: 1Find the vertex and focus of the parabola whose equation is 4y = x2 + 4. aV(0, 4), F(0, 3) bV(0, 1), F(0, 2) cV(4, 0), F(3, 0) dV(1, 0), F(2, 0) 2Find the center and radius of the circle whose equation is x2 + 10x + y2 = 75. aC(–10, 0), r = 100 bC(–10, 0), r = 10 cC(–5, 0), r = 100 dC(–5, 0), r = 10 3Find the foci of the ellipse with the following equation. ((x-1)ˆ2÷9)+((Y+2)ˆ2÷25)=1 aF1(5, –2), F2(–3, –2) bF1(1, 2), F2(1, –6) cF1(4, –2), F2(–2, –2) dF1(1, 1), F2(1, –5) 4Find the slopes of the asymptotes of a hyperbola with the following equation. (Yˆ2÷81)-(xˆ2÷64)=1 a8/9 b9/8 c8/9, –8/9 d9/8, –9/8 Click here to see answer by lwsshak3(6494)

 Question 486598: A line passes through the point (4,3) and intersects the x-axis at x=10. Where does the line intersect the y-axis? choose the answer and explain the reason to choose your response y=4.5 y=7.7 y=6 y=5 Click here to see answer by MathLover1(6627)

 Question 486604: In a regular pentagon, lines are drawn so that every possible pair of vertices are connected. How many triangles are in the resulting figure? choose the answer and explain the reason to choose your response 25 35 20 30 In this question, I believe that the answer is either 35 or 30. I am afraid I am counting the same triangles 5 extra times. Click here to see answer by MathLover1(6627)

 Question 486603: If x^2+x-1=0, what is x^3 + 2x^2 + 2011 closest to? choose the answer and explain the reason to choose your response 2011 2010 2013 2012 Click here to see answer by richard1234(5390)
 Question 486603: If x^2+x-1=0, what is x^3 + 2x^2 + 2011 closest to? choose the answer and explain the reason to choose your response 2011 2010 2013 2012 Click here to see answer by chessace(471)

 Question 486698: Find E, the voltage of a circuit, if I = (2-3i) amperes and R = (3+5i) ohms. Click here to see answer by mervh1967(6)

 Question 486703: Evaluate x squared + 19 divided by 2-x for x =3i Click here to see answer by Tatiana_Stebko(1326)

 Question 486868: What is the GCF and LCM of the monomials and Click here to see answer by checkley79(3050)

 Question 487018: This one that I am sooo stuck on. Please help me. 4x squared + 20x I'm suppose to factor and check by multiplying but, I am stuck. Click here to see answer by jim_thompson5910(28593)

 Question 487031: I am stuck with this one.I am suppose to factor this one. c squared + 6x + 9 Click here to see answer by Theo(3460)

 Question 487237: Hello, I am stuck on this one. This is college algebra. I am suppose to complete the square. x squared + 7x -4 =0 Click here to see answer by MathLover1(6627)

 Question 487353: Solve the equation. (y-3)^2=-49 I have gotten to y^2-3^2=-49. Click here to see answer by MathLover1(6627)

 Question 487766: 1.Evaluate this expression i^-34 2.Evaluate this expression i^-52 Click here to see answer by solver91311(16877)

 Question 489811: Solve in standard form (a + bi) (2+i)/i I first multiplied by i/i to get the following: 2i + i^2 = 2i - 1 = -1 + 2i which is standard form so I thought I was correct. However, the student solution manual that I have shows to multiply by -i/-i instead of i/i which is what I did. When doing so they get opposite answer that I do of 1 - 2i. I'm wondering why that manual suggests the answer is 1 - 2i and why they used the negative i over i versus positive. I really just need to know or understand how they arrived at using the negative. Click here to see answer by MathLover1(6627)
 Question 489811: Solve in standard form (a + bi) (2+i)/i I first multiplied by i/i to get the following: 2i + i^2 = 2i - 1 = -1 + 2i which is standard form so I thought I was correct. However, the student solution manual that I have shows to multiply by -i/-i instead of i/i which is what I did. When doing so they get opposite answer that I do of 1 - 2i. I'm wondering why that manual suggests the answer is 1 - 2i and why they used the negative i over i versus positive. I really just need to know or understand how they arrived at using the negative. Click here to see answer by Edwin McCravy(8908)

 Question 490162: An ocean liner, traveling at 30 km/h leaves port at 7:00am. At 10:00 am, a helicopter leaves the same port and travels the same route at 66 km//h. At what time will the helicopter overtake the liner? Click here to see answer by josmiceli(9671)

 Question 490353: |2x - 6| = 11. How is the solution x -5/2 or 17/2? Click here to see answer by josmiceli(9671)

 Question 491850: please show me the steps on how to solve the following problem (3 + 2i) + (9 - 3i) Click here to see answer by stanbon(57323)

 Question 491852: i dont understand how to find x in 3x/4 - x/3 + 1 = 4x/5 - 3/20 Click here to see answer by stanbon(57323)

 Question 491856: I have no idea if this is a complex number problem or not (it deals with imaginary numbers) but I can't figure out how to solve 4+7i/5+5i. This problem is a fraction Click here to see answer by Alan3354(30993)

 Question 492224: Is (4+9) + 3 = 4 + (9+3) part of the distributive property. commutative property of addition, commutative property of multiplication, associative property of addition, associative property of multiplication, identity property of addition, identity property of multiplication, inverse property of addition, inverse property of multiplication, or transitive property? Click here to see answer by chessace(471)

 Question 492241: Is 4x+12y = 4(x+3y) part of the distributive property. commutative property of addition, commutative property of multiplication, associative property of addition, associative property of multiplication, identity property of addition, identity property of multiplication, inverse property of addition, inverse property of multiplication, or transitive property? Click here to see answer by richard1234(5390)

 Question 492644: write the expression in standard form a+bi. (5+8i)-(6-8i) Click here to see answer by jim_thompson5910(28593)

 Question 493427: what is the real concept of finding minimum and maximum value of modulus z Click here to see answer by richard1234(5390)

 Question 493475: i represents the square root of what number? Click here to see answer by richard1234(5390)

 Question 494977: What is the smallest number that has 8 distinct prime factors? choose the answer and explain the reason to choose your response 510510 270270 9699690 256 Click here to see answer by bucky(2189)

 Question 494983: how would you find x and y x-y=6 2x/3+y/3=1 Click here to see answer by Alan3354(30993)

 Question 494976: Let n!!! denote the product n*(n-3)*(n-6)*...*x where x is either 1, 2, or 3, if n is 1, 2, or 0 more than a multiple of 3, respectively. For example, 10!!! is 10*7*4*1 = 280. Let k be the largest positive integer with the property that 2011!!! is a multiple of 10^k. What is k? choose the answer and explain the reason to choose your response 166 134 167 168 Click here to see answer by richard1234(5390)

 Question 495037: x^4= 16 using complex numbers solve for x. couldn't find any examples like this in the book. i get the same answer every time : 2, -2 yet the back of the book has -2i and 2i also. Click here to see answer by Alan3354(30993)