Tutors Answer Your Questions about Signed-numbers (FREE)
Question 748333: Slove:
12x^2-6x=0
Answer by tommyt3rd(482)   (Show Source):
Question 613432: -3(-2 - 6 x 2) - [4(2 - 4) - 2]
Answer by tommyt3rd(482) (Show Source):
Question 651087: If somebody could please help me on a college algebra problem. I need to simplify this problem :
5/6*(2/3-1/6)+7/18
I started out by reducting it to
(4/6 - 1/6)
5/6*3/6+7/8 than somehow got
15/6+7/8
but than i got stuck.
So could somebody please help me and show me how to do this?
That'd be great. Thank you! :)
Answer by tommyt3rd(482) (Show Source):
Question 680402: D=36+5.8x
Answer by tommyt3rd(482) (Show Source):
Question 713565: How do i factorise the below
(a+2)(2a)+7a+14
and
64x^2+80xy+25y^2
Thanks.
Answer by tommyt3rd(482) (Show Source):
Question 716100: 3+3 x 3-3+3= ?
Answer by tommyt3rd(482) (Show Source):
Question 689586: 4x + 5y = ?
x=6,y=17
Answer by tommyt3rd(482) (Show Source):
Question 719079: 91,92,93,94,880,960,975,977, ----,----.???
Answer by tommyt3rd(482) (Show Source):
Question 639963: mr. bailey purchased some groceries that cost d dollars. he paid with a $50 bill. write an expression for the amount of the change he will receive
Answer by tommyt3rd(482) (Show Source):
Question 746310: If 2x+3y=24 and 2x-3y=12 then value of xy is_____________
Found 2 solutions by mananth, Cromlix:
Answer by mananth(12270)  (Show Source):
You can put this solution on YOUR website!2.00 x + 3.00 y = 24.00 .............1
Total value
2.00 x -3.00 y = 12.00 .............2
Eliminate y
multiply (1)by 1.00
Multiply (2) by 1.00
2.00 x 3.00 y = 24.00
2.00 x -3.00 y = 12.00
Add the two equations
4.00 x = 36.00
/ 4.00
x = 9.00
plug value of x in (1)
2.00 x + 3.00 y = 24.00
18.00 + 3.00 y = 24.00
3.00 y = 24.00 -18.00
3.00 y = 6.00
y = 2.00
xy=9*2=18
Answer by Cromlix(294)  (Show Source):
You can put this solution on YOUR website!2x + 3y = 24.....1
2x - 3y = 12.....2
Add 1 to 2
4x = 36
x = 9
Substitute x = 9
into 1
2(9) + 3y = 24
18 + 3y = 24
3y = 24 - 18
3y = 6
y = 2
Therefore value of xy = 9 x 2 = 18
Question 617695: Solve for b:
(1/b) - (b/(b-1)) = 2
Answer by tommyt3rd(482) (Show Source):
Question 730564: If tan θ= -3 and cos θ<0, then tan θ/2=?
Answer by tommyt3rd(482) (Show Source):
Question 675803: How I write a second inequality with the same meaning: x<5
Answer by tommyt3rd(482) (Show Source):
You can put this solution on YOUR website!The inequality x<5 is a statement about the size of x compared to 5
adding/subtracting...
x+1<5+1
x+2<5+2
x+a<5+a
multiples of both sides...
2x<10
2x<15
bx<5b
In fact many reversible things we do to the left (as well as the right side) are possible :)
Question 653590: How is (-2) squared different from -2 squared
Answer by tommyt3rd(482) (Show Source):
Question 704940: Evaluate each express for x=16 and y=4
3x-3y
Answer by tommyt3rd(482) (Show Source):
Question 715693: (-25) - (-21) = ?
Answer by tommyt3rd(482) (Show Source):
Question 740688: what is the answer to 53-[3(8+2)+5(9-5)]
Answer by tommyt3rd(482) (Show Source):
Question 744711: I am calculating angles and must figure out cosine to the power of -1.
I know what square root is etc., but how do you calculate to a minus power?
Answer by josgarithmetic(1495) (Show Source):
You can put this solution on YOUR website!According to context you are referring to inverse function of cosine. Let me use different notation than the "exponent negative 1".
let x be some angle or angle measurement.
cos(x) is some number between -1 and +1.
The inverse function of cosine, is "arcos()", read as "the arc whose cosine is...". The input is NOT an angle measurement, but is a cosine value.
Common value: 30 degrees is a commonly known or used angle value. DRAW a unit circle to visualize this.  .
Now, it may be asked, what is the arc which has a cosine of  ?
This is equivalent to asking, what is  ?
 .
Question 743682: I need to make the following equation true by adding 2 pairs of brackets
5+7*3-2*9=72
Answer by pfongk(1) (Show Source):
You can put this solution on YOUR website!I wasn't sure how to edit my question. The bulletin board for Uni has stated that it should be 108 not 72 for the answer, I had worked out that answer so I don't need this question answered anymore. Sorry.
Question 742454: Hello
I am just starting back to school and it has been a long time since I've had to do any math problems, let alone Pre-Algebra. I am learning to perform the Order of Operations. I am using the P,E,M,D,A,S method. My problem is...
(-36 / 6) - (4 / 4) so far I have this
-36 4____ But should'nt 4/4=1, -36/6=6 or = to 1
6 4
Answer by Alan3354(30993)  (Show Source):
Question 741501: -1+9(-7g-9)
Answer by jim_thompson5910(28536) (Show Source):
Question 736330: 2[3 - 5(3 - 1)²]
Answer by rfer(12654) (Show Source):
Question 736300: I am dealing with adding signed number. for example: -10+(-7) can u help me.
Answer by jim_thompson5910(28536) (Show Source):
You can put this solution on YOUR website!Both numbers are negative, so you add the numbers (ignore the negative signs) to get 10+7 = 17
Then you make the result negative since both numbers are negative to get the final answer to be -17
Real World Example: you are 10 dollars in debt (represented by the integer -10) and you go 7 more dollars in debt (-7). In total, you are 17 dollars in debt (-17)
Question 735915: (-4+6)[(-8)+(-7)-(-10)] I am not sure how to solve this problem.
Answer by rfer(12654) (Show Source):
Question 731341: help me perform indicated operations
-8[4+(-2+7)]
_______________
-3[4-(-9)]-3(-9)
thank you, Debbie
Espimom1@aol.com
Answer by josgarithmetic(1495) (Show Source):
You can put this solution on YOUR website!The rational expression contains no exponents.
Parentheses:
-8[4+(-2+7)]
_______________
-3[4-(-9)]-3(-9)
= 
Parentheses:
Multiplications:
Divisions? Not ready.
Additions? None as written.
Subtractions:
Divisions:
= 
Question 730116: find how long it takes a person to drive 135 miles if she drives on cruise control set at 60 mph.
Answer by Alan3354(30993) (Show Source):
Question 730029: i need to solve for X: x/a+x/b=1 it's x over a plus x over b = 1, someone just provided the answer and that does not help. i need to see how you actually arrived at the answer.
Answer by lynnlo(4155) (Show Source):
Question 730021: i need to solve for X: x/a+x/b=1 it's x over a plus x over b = 1
Answer by lynnlo(4155) (Show Source):
Question 728633: 1/14+18/x=? I need to know how to do a problem like this
Answer by josmiceli(9667)  (Show Source):
You can put this solution on YOUR website!
This is an expression, not an equation, so
the most you can do with it is express it
as a single fraction.
Multiply the 1st fraction by 
Multiply the 2nd fraction by 
This changes nothing, since you're multiplying
by  in both cases
Hope this helps
Question 726475: 21<6u
Answer by lenny460(764)  (Show Source):
Question 725766: How do I explain to my student: Michelle has 47 dollars, 11 more than Susan.
Is it 47 = s + 11
Answer by Alan3354(30993) (Show Source):
You can put this solution on YOUR website!How do I explain to my student: Michelle has 47 dollars, 11 more than Susan.
Is it 47 = s + 11
----------------
Just saying Michelle has 47 dollars, and it's 11 more than Susan explains that.
What else is there to know?
No other question was asked.
Question 722929: Is (8, -1) a solution of the system, 2x + 3y = 13 and x - y = 9?
Found 2 solutions by DrBeeee, jim_thompson5910:
Answer by DrBeeee(378) (Show Source):
You can put this solution on YOUR website!Put (x,y) = (8,-1) into the two equations and check.
Is (2*8+3*(-1) = 13)?
Is (16 - 3 = 13)?
Is (13 = 13)? Yes
Is (8 -(-1) = 9)?
Is (9 = 9)? Yes
Answer: Yes, (8,-1) is the solution (and only solution) to the given system of equations.
Answer by jim_thompson5910(28536) (Show Source):
You can put this solution on YOUR website!2x + 3y = 13
2(8) + 3(-1) = 13 ... plug in (8,1)
16 - 3 = 13
13 = 13
so (8,1) satisfies the first equation
-------------------------------------------------------
x - y = 9
8 - (-1) = 9 ... plug in (8,1)
8 + 1 = 9
9 = 9
and (8,1) satisfies the second equation
--------------------------------------------------------------
(8,1) satisfies BOTH equations at the same time, so it is the solution to the system of equations
Question 709560: 16x+6+20x-14
Answer by jerryguo41(162)  (Show Source):
Question 709270: y=-3x^2-9x-12 need help finding the vertex and axis
Answer by josgarithmetic(1495) (Show Source):
You can put this solution on YOUR website!EDIT: Fixed the sign mistake.
First, factor. Then complete the square.
The square to add and subtract is  .
The value of "h" is  and the value of "k" is  or  .
The vertex is ( ,  )
Question 709004: y=mx+b, for m
Answer by rfer(12654) (Show Source):
Question 708707: There exist pairs of integers, x and n, for which xn = (25)(4 to the 4th power)(8 to the 8/3 power )(16 to the 3/4 power). What is the greatest
possible value of n among these pairs?
Answer by KMST(1868)  (Show Source):
You can put this solution on YOUR website!Of all the pairs (x,n) whose product is the same  number, the greatest  will be paired with the least positive  .
Since  , the greatest integer that could be is 
So we have to find  =(25)*(4^4)*(8^(8/3))*(16^(3/4))
Either way, that expression is hard to type.
Luckily, it can be simplified, because
 --> 16^(3/4)= 
 --> 8^(8/3)= 
and, while we are at it,
 --> 
So substituting all that, we get a large number that can be calculated with a calculator,
 or with pencil and paper:
NOTE 1:
If it was specified that x, and n could not be 1,
then the least possible positive x would be 2,
and that would make  the greatest possible n.
NOTE 2:
Since  the positive factors are all of the form 
with  being any of the 20 integers from 0 to 19 including 0 and 19,
and  being 0, 1, or 2 (just 3 choices).
That makes the total number of positive factors  .
That makes 60 (x,n) ordered pairs, or 30 {x,n} sets of factors (if order does not matter).
Considering the negative factors doubles the possibilities.
Question 706063: there are 7 children with 1 set of twins. The youngest is 6 and the oldest is 16. the mean is 11, the median is 10 and the mode is 15. What are their ages?
Answer by stanbon(57285) (Show Source):
You can put this solution on YOUR website!there are 7 children with 1 set of twins. The youngest is 6 and the oldest is 16. the mean is 11, the median is 10 and the mode is 15. What are their ages?
---------
Ages from youngest to oldest: 6........10..........16
1st: 6
2nd: x
3rd: y
4th: 10
5th: 15
6th: 15
7th: 16
----
Equation:
Mean = (6+x+y+10+15+15+16)/7 = 11
-----
x+y + 52 = 77
----
x+y = 25
-----
Comment: x+y cannot be 25 if 10 is the median.
=============================
Cheers,
Stan H.
Question 704922: 3a+2=17
Answer by jim_thompson5910(28536) (Show Source):
You can put this solution on YOUR website! Start with the given equation.
 Subtract  from both sides.
 Combine like terms on the right side.
 Divide both sides by  to isolate .
 Reduce.
----------------------------------------------------------------------
Answer:
So the solution is
Question 702926: Can you explain this to me?
1/(x^2+x-2)- 2/(x+2)
Answer by checkley79(3050) (Show Source):
You can put this solution on YOUR website!1/(x^2+x-2)- 2/(x+2) FIND THE COMMON DENOMINATOR.
[(X+2)-2(X^2+X-2)]/(X^2+X-2)(X+2)
[X+2-2X^2-2X+4]/(X^2+X-2)(X+2)
[(-2X^2-X+6]/(X^2+X-2)(X+2)
[(-2X+3)(X+2)]/(X^2+X-2)(X+2) CANCEL OUT THE (X+2) TERMS.
(-2X+3)/(X^2+X-2) ANS.
Question 701696: Hi my name is Gabrielle McGlothen I am in the 6th grade and I was wondering if you could help me with Subtraction of signed numbers please could you i really need help with this i cant not solve wall these numbers and i really need a tutor
Answer by jim_thompson5910(28536) (Show Source):
Question 699139: 5+6+10=
4+9+8=
1+7+3=
9+9+10=
6+5+4=
Answer by checkley79(3050) (Show Source):
Question 698784: solve by using subsitution
4x+4y=-20
x-4y=15
Answer by Simnepi(204)  (Show Source):
You can put this solution on YOUR website!4x+4y=-20 Equation (1)
x-4y=15 Equation (2)
Rearranging (2) gives
x=15+4y Equation (3)
We can now substitute the value of x from (3) into (1)
4*(15+4y)+4y = -20
Multiplying out and simplifying we get
60+20y = -20
therefore 20y = -80
which gives y = -4
Now we can substitute this value of y into either (1), (2) or (3) to find the value of x
lets use (3)
x=15+4y
x=15+4*-4
so x= -1
Question 698785: solve the system algebraically.
Find the number of solutions for the system
-5x+3y=-15
-10x+6y=-30
A)No solution
B)one solution
C)infinite number of solutions
D)None of these
Answer by unlockmath(1599)  (Show Source):
You can put this solution on YOUR website!Hello,
With these:
-5x+3y=-15
-10x+6y=-30
Multiply the first equation by 2 to get:
-10x+6y=-30
Notice this equation is exactly like the second equation:
Therefore, they both lie on each other giving us:
Infinite solutions.
Make sense?
RJ
www.math-unlock.com
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