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

Tutors Answer Your Questions about real-numbers (FREE)

Question 249427: For what values of x is the expression sqrt(4x-x^2) defined as a real number.
Click here to see answer by checkley77(12844)

Question 249742: How is you do theis?
Click here to see answer by College Student(505)

Question 250103: the cost to produce a custom designed t-shirt is five dollars per shirt plus a 40 dollar design fee. what linear equation fits this situation?
Click here to see answer by stanbon(75887)

Question 250527: name the sets numbers to which 457 belongs
Click here to see answer by richwmiller(17219)

Question 251237: find the real roots of the equation: {{81-9x^2=0}}
Click here to see answer by edjones(8007)

Question 251237: find the real roots of the equation: {{81-9x^2=0}}
Click here to see answer by vksarvepalli(154)

Question 251534: 2/3t=18
Click here to see answer by richwmiller(17219)

Question 251915: In the equation D = r * t, to solve for "r" what should I do.
Click here to see answer by solver91311(24713)

Question 251916: a+b+c
A =_____
3
To solve for b in this formula, the first step is to:
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Question 251913: Population of Mexico. In 2006 the population of
Mexico was 107.4 million. If Mexico�s population continues
to grow at an annual rate of 1.43%, then the population
in 2028 will be 107.4(1.0143)= 14 million.
a) Find the predicted population in 2020 to the nearest
tenth of a million people.
b) Use the result of Exercise 129 to determine whether
the United States or Mexico will have the greater
increase in population between 2006 and 2020.
Click here to see answer by stanbon(75887)

Question 251989: 1) If n is a real number, then 2n would never be part of which number set?
A) a real number (B) an irrational number(C) a rational number (D) an imaginary number (E) an integer
2) If 2n^2 is an even integer, what is true about n + 1?
(A) It is an even integer.(B) It is an odd integer.(C) It can be an odd or even integer.(D) It is a prime number. (E) It is a perfect square.
can you give me explanations please

Click here to see answer by Theo(13342)

Question 252244: If x and y are natural numbers, then how many solutions does the equation
x + y = 12 have?
Click here to see answer by Theo(13342)

Question 252194: 1.prove that √3 is irrational
2.prove that if 0 < b < a and n is a positive integer,then
a. bⁿ < aⁿ
b. n√b < n√a where n√ is the positive nth term
c.1/bⁿ>1/aⁿ

Click here to see answer by Edwin McCravy(20054)

Question 251396: {, 40, 36, 34.46}
{3.6, 40, 34.46, 36}
{3.6, 45, 2, 34.46}
{52, 3.6, 6, 40}
which is not arrational #s 1 2 3 or 4
Click here to see answer by Edwin McCravy(20054)

Question 252936: how do you wright n-5 in words?

Click here to see answer by drk(1908)

Question 252942: if 2y x 4x + 40 = 180 then what is the value of 2x + y ... thanks
Click here to see answer by drk(1908)

Question 253313: under which operations is the set(1,2,3,....) closed?
Click here to see answer by Edwin McCravy(20054)

Question 253713: y=x+1
-x+y=3
solve the linear equations
Click here to see answer by richwmiller(17219)

Question 253718: if x an y are any positive real numbers then (/12x^2y^3)(/8xy)=

Where the / is the division sign in front of the number.
Click here to see answer by richwmiller(17219)

Question 253966: if 4/2x-2=1/x+1, then x=
i don't understand how to get the solution, the solution is -3. I just don't understand how to work this equation out.
Click here to see answer by jim_thompson5910(35256)

Question 254068: Show that only one of the numbers n, n+2, n+4 is divisible by 3.
Click here to see answer by solver91311(24713)

Question 255128: Is 3 over pie an irrational number?
Click here to see answer by drk(1908)

Question 255413: Solve the following equation by using the quadratic formula: p^2+8p+16=0
Click here to see answer by checkley77(12844)

Question 255451: what and how do you come up with density of a penny
Click here to see answer by Alan3354(69443)

Question 255467: the greater of 2 consecutive even integers is 20 more than twice the smaller. find the integers
Click here to see answer by richwmiller(17219)

Question 255465: 4 times a number, increased by 25, is 13 less than six times the number. find the number
Click here to see answer by richwmiller(17219)

Question 255471: Solve the following equation by using the quadratic formula: g^2+8g+16=0
Click here to see answer by jim_thompson5910(35256)

Question 255471: Solve the following equation by using the quadratic formula: g^2+8g+16=0
Click here to see answer by richwmiller(17219)

Question 255464: find a number that is 38 lessthan oposite
Click here to see answer by ankor@dixie-net.com(22740)

Question 255416: Solve the following equation by using the quadratic formula: g^2+8g+16=0
Click here to see answer by Fombitz(32388)

Question 256067: Determine those real numbers a for which the opposite of a is the same as the reciprocal of a.
Since a can be any number, wouldnt a- be the only real number? I'm confused. Please help.
Click here to see answer by solver91311(24713)

Question 255972:
5x2 = 39x + 8

Click here to see answer by checkley77(12844)

Question 256349: HELP PLEASE!!
Give an example of two irrational numbers whose product is an irrational number. AND Give an example of two irrational numbers whose product is a rational number.
Click here to see answer by palanisamy(496)

Question 256826: Show Work please....Totally confused
Question: Of a possible quotients of the numbers 10, -1/2, -5, and 1/5, which two produce the largest quotient and which two produce the lowest quotient?

Click here to see answer by richwmiller(17219)

Question 256829: I need to simplify this equation.
x-{x-1-[x-2-(x-3-{x-4-[x-5-(x-6)]})]}
reduces to x-3
start as far in as possible with x-5-(x-6) which becomes x-x-5+6=1
then move out to the next group x-4-(our result 1)

Click here to see answer by richwmiller(17219)

Question 256831: state the property of real number being used in 2x(3+y)=(3+y)2x
Click here to see answer by richwmiller(17219)

Question 256854: What is the "U" symbols and sideways "E" looking symbol in pre algebra?
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Question 257075: The product of two consecutive positive integers is 210. Find them.
Click here to see answer by Alan3354(69443)

Question 257365: Name the property of real numbers illustrated by the equation: (-2)(3+π)=(-2)(π+3)
Click here to see answer by drk(1908)

Question 257495: Which set of numbers is not closed under multiplication? odd integers, even integers, prime numbers, or rational numbers.
Click here to see answer by drk(1908)

Question 258099: Informal proof that the real numbers are closed with respect to subtraction.
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Question 258248: Solve for x, where x is a real number. sqrt(x-6)=6
Click here to see answer by stanbon(75887)

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(32388)

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)

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, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590