Tutors Answer Your Questions about Signed-numbers (FREE)
Question 568173: 48 is 8% of what number?
Answer by jim_thompson5910(21667)  (Show Source):
Question 568580: Multiply: -4.7 x (-8.1)
Found 2 solutions by nyc_function, jim_thompson5910:
Answer by nyc_function(2626)  (Show Source):
You can put this solution on YOUR website!Do you have a calculator?
Just multiply as you normally would any decimal number.
Keep in mind that a negative times a negative is a positive answer.
-4.7 x -8.1 = 38.07
NOTE: My advice for you is to seriously learn the rules for signed numbers. It will make your math journey a lot more pleasant.
Answer by jim_thompson5910(21667) (Show Source):
Question 565810: Perform the indicated operation and, if possible, simplify. Please show all of your work.
2/4 + (-3/7)
Answer by ad_alta(170)  (Show Source):
Question 565814: Perform the indicated operation and, if possible, simplify. Please show all of your work.
-7/10 - 1/5
Answer by ad_alta(170) (Show Source):
Question 565818: Perform the indicated operation and, if possible, simplify. Please show all of your work.
-27/32 * 14/15 *3
Answer by ad_alta(170) (Show Source):
Question 565831: 90/.8=
confused on the decimal point movement
Answer by solver91311(12114)  (Show Source):
You can put this solution on YOUR website!
Move the decimal point on the number with the most decimal places until it is a whole number. Then move the decimal point on the other number the same number of places in the same direction.
For your problem: .8 has 1 decimal place and 90 has 0 decimal places. Move the decimal point one place to the right on the .8 to make 8, a whole number. Then move the decimal point on the 90 (it is there even though you can't see it) one place to the right also, making 900. Now divide 900 by 8.
John
My calculator said it, I believe it, that settles it
Question 565350: I need to use the distributive property to show this:
-3x(x-3) This is what I got...
-3x*x - -3x*3
Am I doing this right? The two negative signs don't look right.?.
Answer by Theo(2967)  (Show Source):
You can put this solution on YOUR website!the problem is:
-3x * (x-3)
you distribute as follows:
(-3x * x) + (-3x * -3)
you then simplify this to:
(-3x^2) + (9x) which becomes:
-3x^2 + 9x
your answer is:
-3x*x - -3x*3
this simplifies to:
-3x^2 + 9x
looks good to me.
Question 559390: (-3.3)x[(2.1)-(12.8-(-0.4))]
I have to solve this using Basic order of operations but not sure where to start. The answer must be rounded to the nearest hundredth. Thanks in advance
Answer by silver13(1) (Show Source):
You can put this solution on YOUR website!First do the innermost parenthesis
(12.8-(-0.4))
Which becomes 12.8+0.4
=13.2
Next, (2.1-13.2)
=-11.1
Lastly, -3.3 x -11.1
=36.63
This answer is correct, I hope this helps
Question 556884: write the first six terms of the sequence
2. an=(n+1)^3
4. an=n/n+3
write the next term int he sequence. then write a formula for the nth term.
6.-3,6,-12,24
write the series with summation notation
8. 4+8+12+16
10. 0+3+6+9+12
find the sum of the series (the symbol is sigma)
12. on top of the sigma is 10, bottom is n=4, and on right is n(2n-1)
14. 30 on top, k=1 on bottom, 4 on right
write a rulen for the nth term of the arithmetic sequence
16. 4, 6, 8, 10, 12
18. d=5, a1=13
20. a4=20, a13=65
find the sum of the first n terms of the arithmetic series
22. (-6)+(-2)+2+6+....n=20
write a rule for the nth term of the geometric sequence
26. 6, 12, 24, 48
28. r=3, a1=6
30. a2=50, a6=.005
find the sum of the series (again the symbol is sigma)
32. on top is 10, bottom is i=1, right is 20(0.2)^i-1
34. on top is 8, bottomis i=1, on right is 2(3/5)^i-1
find the sum of the infinite geometric series (the symbol is sigma)
36. on top is symbol of infinity, bottom is n=1, right is 3(3/4)^n-1
38. on top is symbol of infinity, bottom is n=1, right is 4(-0.2)^n-1
find the common ratio of the infinte geoemtric series with the given sum and first term
40. s=2, a1=0.5
42. s=-5, a1=-2
44. s=6, a1=1/3
Answer by richard1234(4789)  (Show Source):
Question 556301: 3x=460-2i
Answer by jim_thompson5910(21667) (Show Source):
Question 554790: what does x equeal: x+9=-5
Answer by nyc_function(2626) (Show Source):
Question 553257: 12x+6=-10?
what does x equal
Answer by jim_thompson5910(21667) (Show Source):
Question 553046: I am currently tutoring a student at a local middle school. She had this pre-algebra problem from a test that I believe has a syntax error which makes it difficult to solve. However, I have forgotten the rules that would make this a syntax error for me to explain it to her. This is the equation as written:
(-2)-(-8)/(6+4x(-4)-(-6))=x
I have entered this equation on a spreadsheet program and it will not take the equation as written. It forces the parenthesis in this order:
(-2-(-8)/(6+4*(-4)-(-6)))=x
Why is the first equation incorrect and what are the steps to solve?
Respectfully,
Natalie Witte
Answer by solver91311(12114) (Show Source):
Question 552281: 2 + (-8)+ 7
Answer by jim_thompson5910(21667) (Show Source):
Question 551558: Simplify the following expression expression; express in terms of i. √ -108
Answer by mananth(10539)  (Show Source):
Question 551562: Short answer: Raise the quantity in parentheses to the indicated exponent, and simply the resulting express. Express answer with positive exponents.
(-16(x^-2)y^3)^2
-----------------
(80x^-2y^3)
Actually it is one parentheses around entire equation on both sides not two at the top not two at the bottom it just one parentheses around entire equation.
Answer by fcabanski(385) (Show Source):
You can put this solution on YOUR website!
If you need help understanding math so you can solve these problems yourself, then one on one online tutoring is the answer ($30/hr). If you need faster solutions with guaranteed detailed answers, then go with personal problem solving ($3.50-$5.50 per problem). Contact me at fcabanski@hotmail.com
Question 551556: simplify the following quotient of complex numbers into the form a+bi: ( -9+8i)/(1+2i)
Answer by ankor@dixie-net.com(12679)  (Show Source):
You can put this solution on YOUR website!
Multiply by the conjugate of the denominator over itself (same a multiplying by 1), FOIL
*  = 
combine like terms, i^2 = -1
 =  or  +  i
Question 550787: Direction: use one of the formulas for special series to find the sum of the series.
42
∑ 1
i=1
1. 42 is on top of the symbol, i=1 is on bottom and 1 on right side.
2. 5 on top, n on right, n=1 on bottom. the answer is 15 but how?
3. 18 on top, i=1 on bottom, i on right.
4. 20 on top, k on right, k=1 on bottom
5. 6 on top, n^2 on right, n=1 on bottom.
6. 10 on top, i^2 on right, i=1 on bottom
7. 12 on top, i^2 on right, i=1 on bottom
8. 35 on top, k^2 on right, k=1 on bottom
again all these problems are shown in this symbol: ∑
thanks for ur help and happy new year!
Answer by solver91311(12114) (Show Source):
Question 550309: perform the indicated operation, please show all of your work
3/a.b/8
Answer by JBarnum(1826)  (Show Source):
You can put this solution on YOUR website!um...
this is what i see:
(3/(a.b))/8) this a point b looks like 1.3
to me it reads 3 divided by a.b all divided by 8
with what i see there is no way to solve or simplify or anything, please check problem again and repost appropriatly
Question 550311: order the following from least to greatest. be sure to show all of your work
7/8
5/6
-6
-8
5
Answer by zoomkaboom4(49)  (Show Source):
Question 550310: perform the indicated operation. write your final answer exactly as a fraction in lowest terms. please show all of your work
7/10-1/2
Answer by TutorDelphia(189)  (Show Source):
Question 549927: write a rule for the nth term of the arithmetic sequence of the followings:
1. d=4, a14=46
2. d=5/3, a8=24
3. d=-6, a12=-4
4. a5=17, a15=77
5. a2=-28, a20=52
6. d=-4.1, a16=48.2
7. a7=34, a18=122
much help would be appreciated with full works please, not just the answer. thank you very much for ur help and happy new year as well as merry christmas!
Answer by prateekagrawal(47) (Show Source):
You can put this solution on YOUR website!Here the formula is
Tn= a+ (n-1)d
so, for nth term we need to know first term and d.
1. d=4, a14=46
here n=14, tn= 46 and d=4
so,
46 = a+(14-1)*4 = a+13*4
46= a+ 52
so, a= -6
so, nth term is Tn= -4 +(n-1)4
or,
Tn= -4+4n-4
Tn= 4n-8
or
an= 4n-8
Tn and an are notations for nth term only.
in the same way we can do other parts of this also.
Question 548840: Slimplify, using order of operations: 4(-6)-|-2-4(-2)|
Answer by KMST(576)  (Show Source):
You can put this solution on YOUR website!Since the absolute value is a grouping symbol, like parentheses, you have to calculate it first
 ,
but within the absolute value you multiply first to find the product of 4 times (-2), because multiplication has priority over addition and subtraction.
After this point, multiplying 4 times (-6) must be done before subtracting 6, so
If your teacher objects to having more than one equal sign on a line, just do it your teacher's way.
Question 547505: what is the value of the expression 2x2+3xy-4y2 when x=2 and y=-4?
Found 2 solutions by mananth, RiverBaggett:
Answer by mananth(10539) (Show Source):
Answer by RiverBaggett(1) (Show Source):
Question 534615: Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.
Answer by JBarnum(1826) (Show Source):
Question 541888: This operation is tough for me, I think I may know but it would help out greatly if I was shown how it works. Thank you
Also if you could show how it is checked
Thanks again.
Answer by JBarnum(1826) (Show Source):
Question 540351: It says simplify. 5(x-4) - 2(8+x)
Found 2 solutions by jim_thompson5910, stanbon:
Answer by jim_thompson5910(21667) (Show Source):
Answer by stanbon(48502) (Show Source):
Question 5962: HAVING DIFFICULTY WITH NEGATIVES
PROBLEM: W - (-43.7) = -4.342 WHAT IS W? 48.042 OR 39.358?
Answer by k16andrew(1) (Show Source):
Question 534544: Divid and simplify 7v -28/121 / v-4/55v
Answer by Maths68(1140)  (Show Source):
Question 531277: Hello, I am having problems solving this equation. Please assist me in learning. :)
7 - 8r + 3 = 6r - 12 + r
the lone r on the end, is that 1r and do I add 1r to 6r?
I'm confused what do do with that r thats alone
Thank you, Steve
Answer by stanbon(48502) (Show Source):
You can put this solution on YOUR website!7 - 8r + 3 = 6r - 12 + r
the lone r on the end, is that 1r and do I add 1r to 6r?
---
Yes; just think of "r" are cars.
Then you have
7 - 8cars + 3 = 6cars - 12 + 1car
-----
7 -8 cars + 3 = 7cars -12
---
10-8cars = 7cars -12
------
15cars = 22
cars = 22/15
----
r = 22/15
=============
Cheers,
Stan H.
Question 530666: Can you explain me binary operation in algebra ?
Answer by richard1234(4789) (Show Source):
You can put this solution on YOUR website!"Binary" means "two." A binary operation is simply an operation that requires two arguments, or "inputs." For example, the arithmetic operations you learn in elementary school (+, -, x, /) are binary operations. So are dot products, cross products, and other arbitrary operations.
Question 530357: what is +2 X (+4)=
what is -7 X (+14)=
what is -12 X (+12)=
Answer by jim_thompson5910(21667) (Show Source):
Question 530401: I am stuck on the answer to this, I know what it is, but how it was solved
How did it get to 33 over 12 (33/12)
26 = -7 + 12p
Answer by jim_thompson5910(21667) (Show Source):
Question 530055: when solving 3x + 6 = 18, why do you add -6 under the 6 which makes 0 and add -6 under the 18, which makes 12? then it turns out to be 3x = 12, and x = 4. The problem I am having is the signs, why do you use the negative 6?
Answer by rfer(10417) (Show Source):
You can put this solution on YOUR website!In order to remove the 6 from the left side it is necessary to do the opposite of what is there. In this case it is a +6 so you need to subtract to remove it.
In equations it is always necessay to do the same thing to both sides, thus 18-6=12.
Another thought, if you had 3x-6=18 you would add 6 to both sides to remove it from the left side. Always do the opposite to what is there.
Does that help?
Bob
Question 529697: 11(x-1)-2(x-1)
Answer by solver91311(12114) (Show Source):
You can put this solution on YOUR website!
11 rutabagas minus 2 rutabagas equals 9 rutabagas.
11 golf tees minus 2 golf tees equals 9 golf tees.
11 of anything, and that includes (x - 1)s, minus 2 of the same thing equals 9 of the same thing.
John
My calculator said it, I believe it, that settles it
Question 528085: Peter makes 2 dollars an hour more than Steve.
When Peter works a 7 hour shift and Steve works a 5 hour shift, Steve makes 26 dollars less than Peter.
How much do they each make an hour?
Answer by htmentor(580)  (Show Source):
You can put this solution on YOUR website!Peter makes 2 dollars an hour more than Steve.
When Peter works a 7 hour shift and Steve works a 5 hour shift, Steve makes 26 dollars less than Peter.
How much do they each make an hour?
================================
Let S = Steve's hourly wage
Then Peter's wage = S + 2
During his 7 hr shift, Peter makes (S+2)*7
During his 5 hr shift, Steve makes S*5
Since Steve made $26 less than Peter, we can write
5S = 7(S+2) - 26
Solve for S:
5S = 7S + 14 - 26
2S = 12
S = 6
So, Steve made $6 an hr and Peter made $8 an hr
Question 524327: Evaluate 7[32 - 2(1 + 2)] ÷ 7 + 52
Answer by lagbens(14)  (Show Source):
Question 524328: Evalute: when x = 3, y = 2, and z = 19
Answer by Earlsdon(6098) (Show Source):
Question 523000: I need help with this problem: 6-8x2÷4+5. This is what i get when i try it:
6-8x2÷4+5 turns into 6-16÷4+5 turns into 6-4+5 turns into 6-9 which is -3 but -3 isn't one of the answers on the worksheet.
Answer by oberobic(2302) (Show Source):
You can put this solution on YOUR website!You need to specify your problem completely. What you have provided is only an expression, which technically cannot be solved, it can only be simplified. You need an equation to solve.
.
Assuming your equation is:
.
.
.
.
.
.
.
To find the zeroes (roots), set y = 0.
.
.
.
.
.
.
x = -.866 or .866
Question 519527: Simplify
-5+(-8)
Answer by oberobic(2302) (Show Source):
Question 518888: place one set of parenthesis on the left side of the equation to make it true
32+4-12/2*8-5+12/3+7=13
thanks for any help this is driving me nuts
Answer by sudhanshu_kmr(1130)  (Show Source):
Question 514653: please evaluate each expression
(-3*4)-(2*5)
-2[(-3*-4)-6]
Answer by JuicYiRideSolo(1)  (Show Source):
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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
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