# Posts by helper

Total # Posts: 1,943

1. ### Calculus

sin^3 x/cosx dx | = integral sign |sin^2 x tan x dx |(1 - cos^2 x)tan x dx |tan x - cos^2 x tan x dx |tan x - cos^2 x (sin x/cos x) dx |tan x - sin x cos x dx |tan x dx - |sin x cos x dx ln (sec x) - |sin x cos x dx u = cos x du = sin x dx ln (sec x) - |u du ln |sec x| - 1/2 u...
2. ### math

If I understand your poorly worded problem. w = width w + 3 = length P > 24 P = 2w + 2L 2w + 2(w + 3) > 24 Solve for w, the width
3. ### algebra

3(4x+6)+7x Distribute the 3 12x + 18 + 7x 19x + 18 19x = -18 x = ?
4. ### Math

RT = D (rate x time = distance) 800 = rate of 2nd jet T = time of 2nd jet 800T = distance of 2nd jet 600 = rate of 1st jet T + .75 = time of 1st jet (3/4h = .75h) 600(T + .75) = distance of 1st jet Distances are equal 600(T + .75) = 800T Solve for T
5. ### Math

y = x + 3 Pick values for x, solve for y Example, x = 0 y = x + 3 y = 0 + 3 y = 3 (0, 3) x = -1 y = x + 3 y = -1 + 3 y = 2 (-1,2) x = 1 y = x + 3 y = 1 + 3 y = 4 (1,4) Picks more values for x as needed. Use these points to graph.
6. ### 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
7. ### 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
8. ### algebra

w = width 7w = length P = 2w + 2L P = 2w + 2(7w) I leave it to you to simplify.
9. ### Math

7a - 4 + 2a = 3a - 2 9a - 4 = 3a - 2 6a = 2 a = ?
10. ### algebra

n = number 2n = 28 n = 14
11. ### algebra

see above post
12. ### math

10 = 5(t - 10) - 2t 10 = 5t - 50 - 2t 10 = 3t - 50 Can you finish?

14. ### Math

The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list.
15. ### diameter

x = diameter of 1 circle x + 8 = diameter of 2nd circle x + x + 8 = 28 2x + 8 = 28 Solve for x
16. ### Geometry

AB = 4, CD = 7 2*AB = 8 1*CD = 7 2*AB - CD = 1 2*(4) - 7 = 1 8 - 7 = 1
17. ### Trigonometry

1025 * pi/180 = 1025pi/180 = 205pi/36
18. ### algebra

12^-2 = 1/12^2 = 1/144

20. ### 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 = ?
21. ### Physics

See the third link below under Related Questions. This almost exact problem was solved.
22. ### Physics

See the first two links below under Related Questions. This almost exact problem was solved.
23. ### Physics

See link 2 below under Related Questions. This almost exact problem was solved.
24. ### 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.
25. ### 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?
26. ### 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?
27. ### Geometry

you're welcome
28. ### 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 ...
29. ### 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...
30. ### 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?

by the formula v = (-53 ï¿½ âˆš3349)/30 âˆš3349 = 57.87 Calculate v using 57.87 as the exact value for âˆš3349.
32. ### 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

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.
34. ### 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 ...
35. ### 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 ...
36. ### 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).

38. ### 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 ...
39. ### 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

41. ### 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
42. ### 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.
43. ### 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 ...
44. ### Math

What do you mean by 'condense'? Is that what your problem directions say?
45. ### 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.
46. ### 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
47. ### 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

49. ### 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....
50. ### math

A = Lw P = 2L + 2w Lw = 25 2L + 2w = 25 Solve these two equations simultaneously for your answer.
51. ### MATH

Changed subject
52. ### MATH

x^4 - x^2 - 6 (x^2 - 3)(x^2 + 2)
53. ### 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.
54. ### algebra 2

yes, make one up
55. ### 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.
56. ### 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
57. ### 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
58. ### 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)...
59. ### 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 ...
60. ### 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, ...
61. ### 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
62. ### 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 ...
63. ### College Algebra

You're welcome and good luck :).
64. ### 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...
65. ### 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?
66. ### Calculus

You are correct!! Good job :)
67. ### 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.
68. ### 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.
69. ### 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?
70. ### 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
71. ### Algebra

x = 1st angle 2x = 2nd angle x + 2x = 180 Solve for x
72. ### Math

[(-1/2)^-2]^3 (1/(-1/2)^2)^3 = 1/(1/4)^3 = 1/(1/64)=64
73. ### Math

8^(-4/3)= (cube rt 8)^-4 8^(-4/3)= 2^-4 = 1/(2^4) = 1/16 Do you understand?
74. ### COLLEGE ALGEBRA

(2r + 8)/4 = (3r - 6)/3 Yes, you are correct, r = 8.
75. ### 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.

77. ### 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
78. ### Algebra

Re-check your problem. I think you are missing a part here. pollution in a lake modeled by ?
79. ### 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 ...
80. ### 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 ...
81. ### 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
82. ### 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
83. ### 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.
84. ### 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
85. ### 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.
86. ### 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.
87. ### 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
88. ### 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
89. ### Algebra 1B

incomplete problem. are you sure you are not missing part of the problem? your problem cannot be solved as stated.
90. ### 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.
91. ### algebra

reread your post, not enough info is given and it doesn't make sense. copy the problem exactly from your book.
92. ### algebra1

yes, that is correct
93. ### xacc280

post the subject in the 'school subject' box' along with your specific question. What is "week 2, day 7 assignment"?
94. ### phy

see 1st link below under related questions. a very similar question was answered.
95. ### 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.
96. ### 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 ...
97. ### 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.