Questions on Algebra: Real numbers, Irrational numbers, etc answered by real tutors!

Tutors Answer Your Questions about real-numbers (FREE)

Question 258248: Solve for x, where x is a real number. sqrt(x-6)=6
Click here to see answer by stanbon(57226)

Question 258289: 7/9 is an example of a number that is both a rational number and an irrational number. Determine whether the statement is always true sometimes true or never true
Click here to see answer by Fombitz(13828)

Question 259049: What is the equation of the line that contains the points with (x,y) coordinates (–3,7) and (5,–1) ?
A. y = 3x – 2
B. y = x + 10
C. y = –x + 8
D. y = –x +
E. y = –x + 4
Click here to see answer by drk(1908)

Question 259057: What is the number of subsets of set B = {3, 6, 9, 12, 15, 18}?
Click here to see answer by drk(1908)

Question 259061: The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 28 said they had taken physics, 47 said they had taken chemistry and 13 said they had taken both. Twelve said they had taken neither. How many recent high school grads were surveyed?
Click here to see answer by richwmiller(9135)

Question 259284: Name all sets of numbers to which each real number belongs:
12,the square root of 25, negative 2 and 7/9, 8/4.
Click here to see answer by drk(1908)

Question 259783: Name the sets of numbers to which each number belongs.
192.005
-sqrt42
pi

Click here to see answer by Fombitz(13828)

Question 259783: Name the sets of numbers to which each number belongs.
192.005
-sqrt42
pi

Click here to see answer by Alan3354(30970)

Question 259805: for the set
A= { 2,4,6,8} , B= { 1,3,7,9,13,21} , C= { }, and D= { #, &, %, a square, * }

Determine n (D)

Click here to see answer by Fombitz(13828)

Question 259816: Express the set in set-builder notation
of:
Set B is the set of natural numbers greater than 42
Click here to see answer by drk(1908)

Question 259804: In Excercise 103-112 let U = { 0,1,2,4,5,...} A= { 1,2,3,4,...} , B= {
4,8,12,16,...} and
C= { 2,4,6,8,,,}

#106 B U C

Click here to see answer by Fombitz(13828)

Question 259928: Why is every irrational number a real number but not every real number is am irrational number?
Click here to see answer by jim_thompson5910(28476)

Question 260199: Is -3 is a Rational and a Real Number?
Click here to see answer by edjones(7569)

Question 260384: how do i find the rational number between -3.205 and -3.114
Click here to see answer by drk(1908)

Question 260384: how do i find the rational number between -3.205 and -3.114
Click here to see answer by richwmiller(9135)

Question 260781: Determine if the argument is valid or invalid. Give a reason to justify answer.
If you read, then you will have a high score.
You do not read.
You will not have a high score.
(
Valid by the law of detachment
Valid by the law of contraposition
Invalid by fallacy of the converse
Invalid by fallacy of the inverse
Valid by the law of syllogism
Valid by disjunctive syllogism

Click here to see answer by drk(1908)

Question 260818: please, what is the history of π.
Click here to see answer by Theo(3458)

Question 260818: please, what is the history of π.
Click here to see answer by richwmiller(9135)

Question 260885: what is the lowest integer?
Click here to see answer by richwmiller(9135)

Question 260898: 2,4,6,8
Click here to see answer by richwmiller(9135)

Question 261202: Is the square root of -4 a rational or irrational number? If neither wat is it?
Click here to see answer by jsmallt9(3296)

Question 261578: Find (a) a rational, and (b) an irrational number between each given pair.
Sq. root of 6 and Sq. root of 7

Please and thank you!
Click here to see answer by solver91311(16868)

Question 262524: Suppose a is a whole number and b us an irrational number. Is it possible for the product of ab to be a rational number? Explain why or why not?
Click here to see answer by richwmiller(9135)

Question 262574: How do you show that a number is rational, by writing it as a quotient of two integers?
Such as -4
Click here to see answer by dabanfield(803)

Question 263370: Find all solutions of the equation and express them in the form (a+bi)
z + 4 + 12/z = 0
Thanks :)
Click here to see answer by drk(1908)

Question 263370: Find all solutions of the equation and express them in the form (a+bi)
z + 4 + 12/z = 0
Thanks :)
Click here to see answer by richwmiller(9135)

Question 263369: Cant seem to figure this one out :/
Find all solutions of the equation and express them in the form (a+bi)
2x^2 - 2x + 3 = 0
Click here to see answer by drk(1908)

Question 263485: How can you tell the difference between rational and illrational numbers?
Click here to see answer by oberobic(2304)

Question 263734: I am having troubles with a couple problems:
solve the linear equation p/3-3p/8=3
I do not know why I can't get this. Thanks in advance!!
Click here to see answer by mananth(12270)

Question 263876: The sum of three consecutive even integers is 20 more than twice the second integer. Find all three integers.
I just started in geometry and we have algebra review and I know this stuff, I just can't remember or find it in my notes.
Thanks
Click here to see answer by richwmiller(9135)

Question 264832: Hi - I could use some help trying to solve the following problem.
Evaluate the polynomial for x = 1
3x^2 - 5x + 7
Click here to see answer by JBarnum(2044)

Question 264829: Hi - I need to solve the following problem:
Convert to a decimal notation
8.91*10^7
Click here to see answer by Theo(3458)

Question 265230: what is the least common multiple of 18 and 72?
Click here to see answer by drk(1908)

Question 265287: Find the product of 32 and 46. Now reverse the digits and find the product of 23 and 64. The products are the same. Does this happen with any pair of two-digit numbers? Find two other pairs of two-digit numbers (with different digits) that have this property. Note: You cannot use the same answers another student has already posted. Explain your thinking in solving this problem and also include any mathematical work.
Click here to see answer by Edwin McCravy(8880)

Question 265802: For the following equation, state the value of the discriminant and then describe the nature of the solutions.
-4x^2+4x+7=0
What is the value of the discriminant?
Click here to see answer by Alan3354(30970)

Question 265862: 1 over 3
Click here to see answer by JBarnum(2044)

Question 265996: Solve (x + 1 < 5) ∩ (x - 4 > -3).
Click here to see answer by stanbon(57226)

Question 266255: whether ((2^16)+1) prime or composite ?
Click here to see answer by asuar010(324)

Question 266503: dear sir
i have already send a Q .
the Q is "whether ((2^16)+1) prime or composite ?"
i want to see the solution
but the link is not working.
plz help.
thaks and regards
ashish
Click here to see answer by Edwin McCravy(8880)

Question 266609: The variables height and weight could reasonably be expected to have a positive linear correlation, since taller people tend to be heavier, on average, than shorter people. Give an example of a pair of variables which you would expect to have negative linear correlation and explain why. Then give an example of a pair of variables which are likely to have no correlation.
Thank you for all of your help.....I can always count on help from anyone here!!!
Click here to see answer by stanbon(57226)

Question 266776: A couple has a 2/3 probability of passing on brown eyes to their children. If they have four children, what is the probability that none of the children will have brown eyes?
Thank you :)
Click here to see answer by drk(1908)

Question 266865: if 12 men can build a wall in 8 days, in how many days will 16 men build the same wall at the same rate?
Click here to see answer by josmiceli(9654)

Question 267287: 3 over 2x - 5 over 6 equals 2 over 3x
Click here to see answer by stanbon(57226)

Question 267287: 3 over 2x - 5 over 6 equals 2 over 3x
Click here to see answer by palanisamy(496)

Question 268066: xcubed-xsquared+4x-4 find the real number solutions
Click here to see answer by stanbon(57226)

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