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

Tutors Answer Your Questions about real-numbers (FREE)

Question 96527: The problem is: (x+3)(3x-2)=0
So far, I have done: x+3=0 3x-2=0
x=-3 3x=2
x=2/3
Only -3 fits the domain, but 2/3 doesn't. So do I put empty set?
Could you explain please?
Thank you very much!
Click here to see answer by psbhowmick(529)

Question 96564: We have to classificate each number as either a natural number, whole number, integers,rational number, terminating decimal or irrational number.
The ones I have trouble in are the ones that are square roots. For example what would the square root of 49 be? am I classificating the number 7, or am I supposed to classificate it as a square root? I'm so confused
Thank you for your time
Click here to see answer by stanbon(57967)

Question 96831: how do you get these numbers to equal one and three 2,4,9,14,17 i am aloud to use + - * and / and i have to use all the numbers but only one time. it is two different problems.
Click here to see answer by jim_thompson5910(28715)

Question 96638: are intergers natrual numbers?
Click here to see answer by coyote(32)

Question 96886: The problem is (3-8)-(-15+19). I know that when you see something like -(-6), it turns that negative six to positive, but since the operation is in parenthesis, how do I work this problem? And what do I do first?
Click here to see answer by stanbon(57967)

Question 97197: Please explain why every irrational number is a real number but not every real number is an irrational number?
Click here to see answer by edjones(7569)

Question 97373: Translate the phrase into a variable expression
"the sum of 3 and a number"
Click here to see answer by mathslover(135)

Question 97332: If you subtract a negative number from a positive number, the result is always a positive number? Is this true or false? Your supposed to support the answer with a subtraction rule or a number line. Please help, I'm really stuck on this one!!! Thank you
Click here to see answer by longjonsilver(2297)

Question 97529: What is the sum of the first 500 counting numbers.
Click here to see answer by mathslover(135)

Question 97529: What is the sum of the first 500 counting numbers.
Click here to see answer by checkley71(8403)

Question 97591: 10/3 - 2/3*4+5
Click here to see answer by checkley71(8403)

Question 97463: 9-2m=19
7
I can't get the 7 under the 2m but it should read 2m over 7
Click here to see answer by Msgenes(10)

Question 97885: Give an example of a number that is a real number but not an irrational number
Click here to see answer by stanbon(57967)

Question 97890: please help with this
1. solve for x in 6x+12(10-x)=84
2. solve for d in -1/5(10d-5)=9
3.write an algebraic expression
"the product of a number and three is one half of five time the number decreased by one"
Click here to see answer by anjali_yamini(27)

Question 98050: I need help on the following question. I don't understand it. (5-y)
+(6-y)-(5-y)=0
Help

Click here to see answer by checkley71(8403)

Question 98140: Find two numbers whose sum is 92 if the first is four more than seven times the second.
Click here to see answer by edjones(7569)

Question 98272: what is the domain of y =x+1 over x+2
Click here to see answer by Nate(3500)

Question 98413: jOHN and David are running the 1-mile race. David enters the final quarter first and is running at a rate of 18ft./sec. John enters the final quarter 3 seconds later but is running at a rate of 20 ft.sec. Who will win the race?
5280ft.= 1 mile
Click here to see answer by checkley71(8403)

Question 98412: On a number line from -2 to positive 6, what is 3/4 of the way between them?
Click here to see answer by checkley71(8403)

Question 98448: 2. a bag of lawn fertilizer claims that it will cover 5,000 square feet of grass. If your yard is 27,500 square feet, how many bags of fertilizer will you need?
Click here to see answer by mathslover(135)

Question 98488: josh is 72 inches tall. Ruben is 9/10 as tall as Josh. John is 11/12 as tall as Ruben.
a. what is rubens height in inches?
b.what fractional part of joshes height is john?
Click here to see answer by checkley71(8403)

Question 98726: How many ordered pairs (x,y) of
integers satisfy…
(1/X)+(1/Y)=(1/2)
Click here to see answer by Nate(3500)

Question 99007: 2 4/8- 6/8
Click here to see answer by stanbon(57967)

Question 99446: I am trying to classify each set the number belongs to.
the number is 84/12. i have no clue if it could be an integer, rational, or irrational. Can you explain what the terms mean with an example for each???
Click here to see answer by scottnascar(12)

Question 99564: Give an example of a number:
a) that is an integer but not a whole number.
b) that is a real number but not a rational number.

Click here to see answer by Edwin McCravy(8999)

Question 99845: Is the square root of 70 rational or irrational and why? Thank you
Click here to see answer by stanbon(57967)

Question 100036: what are the rules governing operations on real numbers?
Click here to see answer by tutorcecilia(2152)

Question 100106: Determine if sqrt 77 and sqrt(-)are irrational or rational.
I said that 77 was because it could be 77/1, however that would only be 77, so now I have changed my mind. I say sqrt77 is irrational.
Sqrt(-)is not a real number, so haw can it be rational, So I say it is also irrational. Am I correct or no?
I completely do not understand the irrational and rational problems. I have read all that has been answered on here trying to comprehend the rules of them. This is not a problem out of my book, however I have enclosed the book I have been working from.
Click here to see answer by stanbon(57967)

Question 100624: 42y divided by 1/7
Click here to see answer by tutorcecilia(2152)

Question 97312: Write each number in the form a/b using integers to show that this a rational number. The numbers are 0.2, 21.3 and -4.
Click here to see answer by edjones(7569)

Question 101165: Determine whether sqrt(-) is rational or irrational
Click here to see answer by edjones(7569)

Question 101346: 5(7x-5)+(-16)/-1
Click here to see answer by ckaeser(6)

Question 101358: 5(7x-5)+(-16)/(-1)
Click here to see answer by jim_thompson5910(28715)

Question 101856: How do you multiply and divide positive and negative numbers?
Click here to see answer by elima(1433)

Question 102003: 28-4x2 divided by one half

Click here to see answer by edjones(7569)

Question 102233: Hello. I was wondering if you could please assist me with this math problem. I've been having a lot of trouble with it. By the way, the / symbol means that the two numbers on each side the numerator and denominator.
-5a-(-1/2b)+31/2a-1/2b= ?
Thank you very much.

Click here to see answer by stanbon(57967)

Question 102231: is seven an irrational number?
Click here to see answer by stanbon(57967)

Question 102231: is seven an irrational number?
Click here to see answer by Edwin McCravy(8999)

Question 102227: -5a-(-1/2b)+31/2a-1/2b
Click here to see answer by edjones(7569)

Question 102483: I need to present a project that wants 12 examples of 4 different types of irrational numbers. I know they presented as square roots, and fractions. Can you please help me understand what the other two could be?
Click here to see answer by stanbon(57967)

Question 102807: Find two consecutive odd integers whose sum is 56. How do I do this?
--Thanks
Click here to see answer by jim_thompson5910(28715)

Question 102905: My teacher gave us a problem not in our textbook.
For a repeating number 3.181818..., what is the way to find it's ratio if x equals .1818...
I've tried dividing 18 by 100 and simplyfying it to 9/50, but can't get to the answer which is
35/11. Thank you very much!!
Click here to see answer by mathemanic(13)

Question 102954: (3x-2)^2-9(3x-2)+18=0 Find real solutions of the equation.
Click here to see answer by Fombitz(13828)

Question 102959: i stands for iota which equals -1
is it real and rational, real and irrational, or complex?
I'm thinking it is real and rational.-1 is on the number line. I'm thrown off by the word real. Is i classified as a real number, even though it is imaginary?

Click here to see answer by MathLover1(6812)

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