Questions on Algebra: Complex Numbers answered by real tutors!

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Question 52631: The additive inverse of the number 1 + 4i is:
a. -1 + 4i
b. 1/17 - 4/17 i
c. -1 - 4i
d. 1 - 4i
Click here to see answer by venugopalramana(3286)

Question 52633: The multiplicative inverse of 1 is:
a. It doesn't have a multiplicative inverse; it is the multiplicative identity.
b. -1
c. 0
d. 1
Click here to see answer by venugopalramana(3286)

Question 52751: Factor completely:
2x^2-50
Thanks for your help !
Click here to see answer by tutorcecilia(2152)

Question 52753: Factor Completly:
5x2+25x-180
Thanks for your help and time !
Click here to see answer by tutorcecilia(2152)

Question 52756: Solve for x:
x^2+5x=6(x+2)

Click here to see answer by tutorcecilia(2152)

Question 52752: Factor Completely:
6x^2-7xy-5y^2
Click here to see answer by AnlytcPhil(1276)

Question 52754: Solve for X:
6x^2-19x-7=0
Thanks for your help and time !
Click here to see answer by rchill(405)

Question 52818: this question has been driving me nuts for days!!
it says to prove that:
(1+z)/(1+conjugate z) = z
so i have tried all sorts of things, i think that i am meant to change it into polar form to get the answer from that but all i do is end up going round in big circles or else end up with huge long lines of numbers and letters that are impossible to simplify!
help please!
Click here to see answer by AnlytcPhil(1276)

Question 52810: When Sheila asked Margie to deliever camp supplies across the lake, they agreed to meet on the water. Shelia's boat can travel at 10km/h, while Margie's boat can do 12km/h. If the lake is 6.6 km wide and Sheila and Margie leave at the same time, how much time will it be before they meet?
Click here to see answer by funmath(2925)

Question 52759: Factor Completely:
10x^2-11x-6
Click here to see answer by rchill(405)

Question 52706: At 10:30 am two planes leave New York, one flying east at 560 km/h and the other flying west at 640 lm/h. At what time will they be 2100 km apart?
Click here to see answer by rchill(405)

Question 52893: Factor Completely:
y^4-16
Thanks !
Click here to see answer by tutorcecilia(2152)

Question 52892: Factor Completely:
x^2+16x+48
Thanks !
Click here to see answer by tutorcecilia(2152)

Question 52889: Factor Completely:
y^3-8
Thanks !
Click here to see answer by tutorcecilia(2152)

Question 52891: Factor Completely:
4x^2-28x+49
Thanks !
Click here to see answer by smartness(7)

Question 52963: what is the answer for
Square root of(-8)
Click here to see answer by mathchemprofessor(65)

Question 52963: what is the answer for
Square root of(-8)
Click here to see answer by funmath(2925)

Question 53087: the larger of 2 consecutive integers is 10 more than twice the smaller.find the integers?
Click here to see answer by funmath(2925)

Question 53387: Erin's three test scores were consecutive odd integers. If her next test score is 18 points more than the highest score of the three tests, her total number of points will be 328. Find Erin's test score.
Click here to see answer by stanbon(57282)

Question 53388: Julius wieghs twice as much as each of his twin brothers. If each of the twins gain 5lb and Julius gains twice that amount, the sum of the three brother's wieght will be 240lb. How much does each wiegh right now?
Click here to see answer by stanbon(57282)

Question 53194: The set of non-zero complex numbers is closed under which operation(s)?
Click here to see answer by venugopalramana(3286)

Question 53420: Erin's three test scores were consecutive odd integers. If her next test score is 18 points more than the highest score of the three tests, her total number of points will be 328. Find Erin's test scores.(not just the score on her last test.)There should be 4 answers.
Click here to see answer by stanbon(57282)

Question 53421: The width of a rectangle is 6cm less than the length. A second rectangle, with a perimter of 54 cm is 3cm wider and 2 cm shorter than the first. What are the dimensions for each triangle?
Click here to see answer by aaaaaaaa(138)

Question 53463: factor out 4xsquared + 9
Click here to see answer by Earlsdon(6287)

Question 53510: please perform the indicated opertion and write answer in standard form, thank you
5i+(-9-i)
Click here to see answer by mathchemprofessor(65)

Question 53509: please show work
-7i(6i-3)
Click here to see answer by mathchemprofessor(65)

Question 53508: perform operation and write answer in stand form please
(-6+i)(-6-i)
Click here to see answer by mathchemprofessor(65)

Question 53508: perform operation and write answer in stand form please
(-6+i)(-6-i)
Click here to see answer by bubblz190(11)

Question 53507: perform the indicated operation and write answer in standard form please
(3+9i)(3-9i)
Click here to see answer by mathchemprofessor(65)

Question 53520: What is the answer for (0+i^2)*(0+i^2)
Click here to see answer by tutorcecilia(2152)

Question 53613: The combined resistance of two resistors, R1 and R2in a parallel

circuit is given by the formula:
Rr = 1
------------
1 + 1
------------
R1 + R2
Simplify the formula? HELP
Click here to see answer by stanbon(57282)

Question 52626: Which of the following statements is not true?
a. Multiplication distributes over subtraction.
b. Multiplication distributes over addition.
c. Exponents distrubute over addition.
d. Exponents distribute over multiplication

Click here to see answer by stanbon(57282)

Question 53610: Simplify complex fractions
(1 - 2/r - 8/r^2)/ (1 - 1/r - 6/r^2)
Please show me how it's done. I have several more to do and can follow this example. Thanks
Click here to see answer by stanbon(57282)

Question 53637: Given: Z^2 = -6 - J7. Z^3 = 4 + j
Z^2 OVER Z^3 Answer in the for of a + jb
Click here to see answer by stanbon(57282)

Question 53755: Find a number whose product with 6 is the same as its sum with 45.
Click here to see answer by rchill(405)

Question 53760: A total of 720 people attended the school basketball game. Adult tickets cost $2.50 each and student tickets cost $1.50 each. If $1220 worth of tickets were sold how many students and how many adults attended?
Click here to see answer by checkley71(8403)

Question 53758: Aaron, Betsy,and Charita work part time at the public library. Betsy works 4hours more each week than Aaron, and together they work as many as Charita. How long does each person work if their total is 45h?
Click here to see answer by funmath(2925)

Question 53738: What values for x must be excluded in the following fractions.
(9x+2)/(x^2-9x+14)
Click here to see answer by aaaaaaaa(138)

Question 53865: consider the following function
{(300,2),(-300,2) (92,1), (-92,1),(15,0),(-15,0),(1,1),(-1,1)}
a. identify its domain
b. identify its range
my answer a. {x:-300 b. {y:-1 my answer was wrong what did I do wrong
Click here to see answer by Nate(3500)

Question 53866: the question is to solve the problem
3/4y-4/6=5/12y
my answer was -4y
what did i do wrong
Click here to see answer by Nate(3500)

Question 53874: solve for b2 in the formula 2A=h(b1+b2)
not sure how to solve

Click here to see answer by ankor@dixie-net.com(15645)

Question 54001: Martha has some nickels and dimes worth $6.25. She has three times as many nickels as dimes. How many nickels does she have?
Click here to see answer by checkley71(8403)

Question 54003: Rachel spent $16.18 for some cans of dog food costing $.79 each and cans of cat food costing $.69 each. She bought 2 more cat food than dog food. How many cans of dog and cat food did she buy?
Click here to see answer by checkley71(8403)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365