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April 19, 2015

Posts by Helper


Total # Posts: 1,735

Algebra 2
L = no. of liters of 80% solution .80L = value of 80% solution 10 - L = no. of liters of 40% solution .40(10 - L) = value of 40% solution .48(10) = value of mixture .80L + .40(10 - L) = .48(10) Solve for L L = no. of liters of 80% solution 10 - L = no. of liters of 40% solution
January 24, 2011

geometry
Ratio of sides is 6:15 = 6/15 = 2/5 Ratio of perimeter is 22:x 2:5 = 22:x 2/5 = 22/x cross multiply and solve for x
January 24, 2011

algebra
w = width 7w = length P = 2w + 2L P = 2w + 2(7w) I leave it to you to simplify.
January 24, 2011

Math
7a - 4 + 2a = 3a - 2 9a - 4 = 3a - 2 6a = 2 a = ?
January 24, 2011

algebra
n = number 2n = 28 n = 14
January 24, 2011

algebra
see above post
January 24, 2011

math
10 = 5(t - 10) - 2t 10 = 5t - 50 - 2t 10 = 3t - 50 Can you finish?
January 24, 2011

math
see your other post
January 24, 2011

Math
The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list.
January 24, 2011

diameter
x = diameter of 1 circle x + 8 = diameter of 2nd circle x + x + 8 = 28 2x + 8 = 28 Solve for x
January 24, 2011

Geometry
AB = 4, CD = 7 2*AB = 8 1*CD = 7 2*AB - CD = 1 2*(4) - 7 = 1 8 - 7 = 1
January 24, 2011

Trigonometry
1025 * pi/180 = 1025pi/180 = 205pi/36
January 24, 2011

algebra
12^-2 = 1/12^2 = 1/144
January 24, 2011

GEOMETRY
see your earlier post
January 24, 2011

Pre Algebra
length = L width = w Ratio = L:w = 10:7 = L:70 10:7 = L:70 10/7 = L/70 cross multiply 700 = 7L L = 100 L = 100, w = 70 P = 2w + 2L P = ?
January 24, 2011

Physics
See the third link below under Related Questions. This almost exact problem was solved.
January 24, 2011

Physics
See the first two links below under Related Questions. This almost exact problem was solved.
January 24, 2011

Physics
See link 2 below under Related Questions. This almost exact problem was solved.
January 24, 2011

Physics? Help Needed
FYI-If you want help, it is important that you put the school subject name in the 'School Subject' box. I changed it for you.
January 24, 2011

Math Urgent
(sqrt(5)) + (sqrt (20)) Breakdown (sqrt(20)) (sqrt(5)) + (sqrt(4))(sqrt(5)) (sqrt(5)) + 2(sqrt(5)) Can you add them now?
January 24, 2011

math
"I tried several combinations using -3,2,and -1 in place of m but still not coming out right." Are you missing part of this problem? There is no 'm' anywhere in your posted problem to replace?
January 24, 2011

Geometry
you're welcome
January 24, 2011

Geometry
I got angle NMO = 61 same method as above, but correction for LMO = x + 32 Therefore, angle LMO = angle NMO angle NMO = angle LMN - angle LMO angle NMO = 5x - 23 - (x + 32) angle NMO = 5x - 23 - x - 32 angle NMO = 4x - 55 angle LMO = angle NMO x + 32 = 4x - 55 3x = 87 x = 29 ...
January 24, 2011

Geometry
Thank you. That's much better. If I am understanding your description, A line that bisects an angle divides it into two congruent parts. Therefore, angle LMO = angle NMO angle NMO = angle LMN - angle LMO angle NMO = 5x - 23 - (x + 3) angle NMO = 5x - 23 - x - 3 angle NMO...
January 24, 2011

Geometry
What is LMN? For example, is this a line segment, triangle, or ? How did you get 45.75? You need to post a better explanation. Think of it like this. If you knew absolutely nothing about this problem could you solve it with just the info you posted?
January 24, 2011

Math Please Help
by the formula v = (-53 � √3349)/30 √3349 = 57.87 Calculate v using 57.87 as the exact value for √3349.
January 24, 2011

math/ CIRCUMFERENCE of a circle
- find out how many feet are in 1 yard - divide 5280 feet by 2 (which would equal half a mile) - take that number and divide by how many feet the circumference of the wheel is
January 24, 2011

6th grade math
5 / 1/3 5 x 3 = 15 1/3 x 3 = 3/3 = 1 15/1 Then find the quotient, 15/1 = 15 IF you did have to divide 5 by 3/9 you would multiple 5 by the reciprocal of 3/9, so 5 / 3/9 = 5 x 9/3 = 45/3 Yes, you were correct IF you had to divide by 3/9.
January 24, 2011

algebra
I answered your post below with this same question. Please check to see if your post was answered before re-posting. I pasted the answer here for you. x = liters of 3% solution 3 - x = liters of 10% solution .03x = value 3% solution .10(3 - x) = value 10% solution 3 = liters ...
January 23, 2011

Math
log2(log4x)=1 Rewrite as (log((log(x))/(log(4))))/(log(2)) = 1 Divide both sides by 1/(log(2)): log((log(x))/(log(4))) = log(2) Cancel logarithms by taking exp of both sides: (log(x))/(log(4)) = 2 Divide both sides by 1/(log(4)): log(x) = 2 log(4) Cancel logarithms by taking ...
January 23, 2011

financial analysis
I am pretty sure it is a current asset. A current asset has a life of one year or less (e.g., inventory) while a noncurrent asset has a life in excess of one year (e.g., machinery).
January 23, 2011

Math
Answered in a later post.
January 23, 2011

algebra
x = liters of 3% solution 3 - x = liters of 10% solution .03x = value 3% solution .10(3 - x) = value 10% solution 3 = liters of 7.9% mixture .079(3) = 0.237 = value 7.9% mixture .03x + .10(3 - x) = 0.237 Solve for x, which is number of liters of 3% solution. (3 - x) = number ...
January 23, 2011

math
(1/2)^x = 1152 rewrite as, 2^(-x) = 1152 Take the logarithm to the base 2 of both sides: -x log 2 = log 1152 -x = (log(1152))/(log(2)) Divide both sides by -1: x = -(log(1152))/(log(2)) x = - 3.061452/0.3010299 x = -10.1699
January 23, 2011

algebra 2
See links below under Related Questions. This exact question was answered.
January 23, 2011

geometry
Triangle has 180 degrees 22.5 + 101 = 123.5 180 - 123.5 = 56.5 A. 56.5 Obtuse triangle: An obtuse triangle is a triangle having an obtuse angle. Obtuse angle: An obtuse angle is an angle whose measure is more than 90 degrees and less than 180 degrees. B. Obtuse triangle
January 23, 2011

ela
FYI, you might be helped faster if you followed directions and put the name of your school subject in the box instead of whatever 'ela' is. This way, a tutor that is familiar with your subject can answer.
January 23, 2011

algebra
I don't think this problem is correct or that it can be solved. Either that, or the problem is poorly worded (to me). If they are each saving to buy the same CD's and Juan is only short $3.00, how can it be that when they combine their money they still do not have ...
January 23, 2011

Math
What do you mean by 'condense'? Is that what your problem directions say?
January 23, 2011

college math 209
You need to use parentheses in this problem. What are the ? for or mean? Square root of 48 or 48yv^2 or ? Same for the other square root. Please use parentheses and retype your problem here in a reply post.
January 23, 2011

Pre-Calc
sqrt(x-6)+sqrt(x+10) = 8 sqrt(x-6) = 8 - sqrt(x+10) Square both sides x - 6 = (8 - sqrt(x + 10))^2 Expand out terms on the right hand side x - 6 = x - 16sqrt(x + 10) + 74 16sqrt(x + 10) = 80 Divide both sides by 16 sqrt(x + 10) = 5 Square both sides x + 10 = 25 x = 15
January 23, 2011

Math
3p^2 + 4p^2 = 63 7 p^2 = 63 Divide both sides by 7: p^2 = 9 Take the square root of both sides: p = -3 or p = 3
January 23, 2011

Math
See your post above.
January 23, 2011

algebra
RT = D (rate * time = distance) 4.1 = Emma's rate 3.7 = Mason's rate T = Emma's time T + .08 = Mason's time (48/60 = 0.8h) 4.1T = Emma's distance 3.7(T + 0.8) = Mason's distance Distances are equal to each other 3.7(T + 0.8) = 4.1T 3.7T + 2.96 = 4.1T 0....
January 23, 2011

math
A = Lw P = 2L + 2w Lw = 25 2L + 2w = 25 Solve these two equations simultaneously for your answer.
January 23, 2011

MATH
Changed subject
January 23, 2011

MATH
x^4 - x^2 - 6 (x^2 - 3)(x^2 + 2)
January 23, 2011

Calc
See the links below under Related Questions. Similar problems have been posted before and some of the info in those posts maybe be helpful.
January 23, 2011

algebra 2
yes, make one up
January 22, 2011

algebra 2
Plug a value for x (price of the suit) in each equation and then solve each equation. This way you can see if one results in a lower price. Explain why or why not, one equation results in a lower price.
January 22, 2011

Algebra 1
3y + 6x + 3 = 9 + 6x Subtract 6x from both sides 3y + 6x - 6x + 3 = 9 + 6x - 6x 3y + 3 = 9 Subtract 3 from both sides 3y + 3 - 3 = 9 - 3 3y = 6 Divide both sides by 3 3y/3 = 6/3 y = 2
January 22, 2011

Algabra
Time = Distance/Rate x = Javier's rate x + 5 = Kathy's rate 57/x = Javier's time 72/(x+5) = Kathy's time Since their time is equal, 57/x = 72/(x + 5) 72x = 57(x + 5) Solve for x
January 22, 2011

Calculus
1/(sqrt3)arctan(5/(29(sqrt3))= 0.0572826 Check you values for 1/a and x/a maybe that's where you got hung up | dx/(a^2 + x^2) (3/4 + w^2) a^2 = 3/4 a = (sqrt3)/2 x^2 = w^2 x = w So, you should have got, 1/2(1/(sqrt3/2)arctan (w/(sqrt3/2)) which simplified is, 1/2(2/(sqrt3)...
January 22, 2011

Calculus
1/2[2/(sqrt3)arctan(2(x^2+1/2)/(sqrt3) I distributed the 1/2, but backed it out for my above answer...I don't think I made any errors backing it out. Here is the answer, with the 1/2 distributed. I know this answer is right because I double check it with an online ...
January 22, 2011

Calculus
integrate x/(x^4+x^2+1) | = integrate symbol u = x^2 du = 2x dx 1/2 du = x dx 1/2 | du/(u^2 + u + 1) Complete the square u^2 + u = -1 u^2 + u + 1/4 = -1 + 1/4 (u + 1/2)^2 + 3/4 1/2 | du/((u + 1/2)^2 + 3/4) w = u + 1/2 dw = du 1/2 | dw/(w^2 + 3/4) 1/2 | dw/(3/4 + w^2) And, ...
January 22, 2011

beginning algebra
u^2 - u - 30 = 0 Using the quadratic formula, x =(-b +- (sqrt(b^2 - 4ac))/2a a = 1, b = -1, c = -30 x = 1 +- (sqrt(-1^2 - 4(1)(-30))/2 x = (1 +- (sqrt(1 + 120))/2 x = (1 +- (sqrt(121))/2 x = (1 +- 11)/2 x = (1 + 11)/2 = 6 x = (1 - 11)/2 = -5
January 22, 2011

beginning algebra
This was answered the first time you posted it. I pasted the answer below. (u - 1)^2 = 2u^2 - 3u - 29 u^2 - 2u + 1 = 2u^2 - 3u - 29 u^2 - u - 30 = 0 This does not factor. Solve by using the quadratic formula or the method of completing the square. Post your answer and someone ...
January 22, 2011

College Algebra
You're welcome and good luck :).
January 22, 2011

College Algebra
I'll try, but the formatting here doesn't allow for easy alignment of columns. xxxxxxxxxxxxx-3x^2 - 9x - 9 -2x^2+3x-3 |6x^4 + 9x^3 + 0x^2 + 0x +9 ------------6x^4 - 9x^3 + 9x^2 subtraction-------18x^3 - 9x^2 ------------------18x^3 - 27x^2 + 27x subtraction...
January 22, 2011

College Algebra
First rearrange and simplify the numerator to: 6x^4 + 9x^3 + 9 Just divide as your would with any long division problem. If you post your answer I can tell you if you are correct. Is there something in particular you do not understand?
January 22, 2011

Calculus
You are correct!! Good job :)
January 22, 2011

Math Need an explanation
thanks REINY. After seeing your post, the problem, as I typed without parentheses, is apparent. I don't know why I didn't see that! Parentheses are nice though.
January 22, 2011

Math Need an explanation
You need to use parentheses in your problem 5^2/3x25^2/3=25 I have no idea what this means? Is this your problem? 5^2/3 x 25^2/3 = 25 This does not equal 25.
January 22, 2011

MATH EMERGENCY
In this form Ax + By + C = 0 Slope m = -A/B y-intercept b = -C/B You are looking for, a negative slope Slope m = -A/B And, a positive y-intercept C/B So, Ax + By - C = 0 Can you answer now?
January 22, 2011

Precalculus Someone help please
((3^-3 * 3^5)/3^-2)^-1/2 ((1/3^3 * 243)/(1/3^2))^-1/2 ((1/27 * 243)/(1/9))^-1/2 ((243/27)/(1/9))^-1/2 (9/(1/9))^-1/2 81^-1/2 1/(sqrt81) = 1/9
January 22, 2011

Algebra
x = 1st angle 2x = 2nd angle x + 2x = 180 Solve for x
January 22, 2011

Math
[(-1/2)^-2]^3 (1/(-1/2)^2)^3 = 1/(1/4)^3 = 1/(1/64)=64
January 22, 2011

Math
8^(-4/3)= (cube rt 8)^-4 8^(-4/3)= 2^-4 = 1/(2^4) = 1/16 Do you understand?
January 22, 2011

COLLEGE ALGEBRA
(2r + 8)/4 = (3r - 6)/3 Yes, you are correct, r = 8.
January 22, 2011

COLLEGE ALGEBRA
Not correct Post your work and someone can explain what you are doing wrong. First simplify 8/4 and 6/3 and then combine like terms.
January 22, 2011

Algebra
Please see your 1st post for response.
January 22, 2011

Algebra
C = 6000/(200 - 2x) C = 6000/(200 - 2(75)) C = 6000/(200 - 150) C = 6000/50 C = 120 mil 120,000,000 million or, is it C = 6000/(200 - 2(.75)) C = 6000/(200 - 1.5) C = 6000/198.5 C = 30.2267 mil 30,226,700 million I think it's the first, but I am not a tutor
January 22, 2011

Algebra
Re-check your problem. I think you are missing a part here. pollution in a lake modeled by ?
January 22, 2011

algebra
I don't think this problem is correct or that it can be solved. Either that, or the problem is poorly worded (to me). If they are each saving to buy the same CD's and Juan is only short $3.00, how can it be that when they combine their money they still do not have ...
January 22, 2011

Math
FIFO-first in, first out 300 @ 11.00 150 @ 10.50 200 @ 10.75 175 @ 10.00 100 @ 12.00 Beginning Inventory Total = 925 Ending Total = 300 Difference = sold = 625 FIFO-first in, first out Items sold are assumed to be subtracted from the first ones purchased. Go down from the top ...
January 22, 2011

algebra
x = lbs of cheaper coffee 10x = value of cheaper coffee 4 = lbs of better coffee 4 * 20 = 80 = value of better coffee 20 + x = lbs of mixture 5(20 + x) = value of mixture 10x + 80 = 5(20 + x) Solve for x
January 22, 2011

Math
Simplify 7sqrt(3/6) Breakdown the radicals 7 (sqrt3)/(sqrt6) 7 (sqrt3)/(sqrt3)(sqrt2) 7/(sqrt2) Rationalize the denominator 7/(sqrt2)*(sqrt2)/(sqrt2) 7/2 (sqrt2) or 7(sqrt2)/2
January 22, 2011

chemistry
Have you attempted to do any of the problems you have posted? Post your work and explain where you are stuck and someone will help you. Tutors do not do your homework for you.
January 22, 2011

Algebra
f(x)=8x2+4*4x you need to use parentheses do you mean? 8x^2 + 4*4x or? f(x)=(8x^2 + 4)*4x
January 22, 2011

College Algebra
What in particular do you need help with? Use long division as you would with any other long division problem. If you post your answer I can check it for you.
January 22, 2011

beginning algebra
(u - 1)^2 = 2u^2 - 3u - 29 u^2 - 2u + 1 = 2u^2 - 3u - 29 u^2 - u - 30 = 0 This does not factor. Solve by using the quadratic formula or the method of completing the square. Post your answer and someone will check it for you.
January 22, 2011

beginning algebra
15v^4w^8 and 9vw^5x^4 You need to find the least common factors that these two expressions have in common. LCM = 3vw^5
January 22, 2011

beginning algebra
2 + 7/y = 3/5 Get rid of the denominators Multiply both sides by y 2y + 7 = 3/5 y Multiply both sides by 5 10y + 35 = 3y Subtract 10y from both sides 35 = -7y Divide both sides by -7 -5 = y y = -5
January 22, 2011

Algebra 1B
incomplete problem. are you sure you are not missing part of the problem? your problem cannot be solved as stated.
January 22, 2011

computers
see the first two links below under related questions. this exact question was posted and answered below. also, you might want to look at some of the links supplied within these posts.
January 22, 2011

algebra
reread your post, not enough info is given and it doesn't make sense. copy the problem exactly from your book.
January 21, 2011

algebra1
yes, that is correct
January 21, 2011

xacc280
post the subject in the 'school subject' box' along with your specific question. What is "week 2, day 7 assignment"?
January 21, 2011

phy
see 1st link below under related questions. a very similar question was answered.
January 21, 2011

Geometry
sorry, I didn't know that. you should have said that in your 1st post above. the tutors would see that this question was answered and refer you to the original answer.
January 21, 2011

Geometry
This was answered by DrRuss on 1/21 at 6:39 am. I can't link so I pasted his answer below. I would start with a drawing as I do for most problems. Draw a reactangle 4x one side and b the other. The perimeter is then 4x+b+4x+b=11 8x+2b=11 if this is folded to a tube then ...
January 21, 2011

biology
see 1st link below under related questions. this exact question was posted recently. a link is provided with info that you might find useful.
January 21, 2011

geometry
and? please recheck your problem. not enough info.
January 21, 2011

Physics
see link 1 below under related questions. a very similar problem was answered.
January 21, 2011

algerbra
not enough info, please re-check your problem.
January 21, 2011

ALGEBRA
see your first post below, I solved it for you and explained
January 21, 2011

maths
P = a + b + c add the three sides P = 8x - 7w + 3x + 9y + 3y + 5w combine like terms
January 21, 2011

math
by the cofunction property cos B = sin A so, if angle B = 33 angle A = ?
January 21, 2011

precalc
Sine is an odd function, sin(-θ)= -sin θ
January 21, 2011

precalculus
2 rads to converts radian to degrees, multiply by 180/pi 2 * 180/pi = (2 * 180)/3.14 = ?
January 21, 2011

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