# Posts by helper

Total # Posts: 1,903

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4. ### MATH

Please learn to type exponents as ^2 (means to the second power) (4^(-1)m^(-2)n^(-3)/(2mn)^(-3)) (1/4 1/m^2 1/n^3)/(1/(8m^3n^3)) (1/(4m^2n^3))/(1/(8m^3n^3)) (8m^3n^3)/(4m^2n^3) = 2m
5. ### Calculus

If you put (-1)^(4/3) in a calculator you get = -0.5 - 0.866025404 i (I used google calculator) If you put in "cube root (-1)" you get -1. -1 * 4 = -1 Using, (-1)^(4/3) = -1 3/8 (8)^(4/3) - 3/8 (-1)^(4/3) 3/8 (16) + 3/8 6 + 3/8 = 51/8 So, the book answer of 51/8 is ...
6. ### Algebra

I can't graph this for you. What do you not understand about graphing? Pick values for x and solve for y. After you get a handful of x,y values, plot the points for your graph.
7. ### algebra

3³+53*(39)-(2+5*9) 27 + 2067 - (2 + 45) 2094 - 47 = 2047
8. ### Algebra

Please check your 1st post. Also, please have patience. Tutors volunteer their time answering questions. Sometimes an answer is given very quickly and other times it could take a few hours.
9. ### Accounting ethics

Have you googled "How to CONDUCT a stakeholder analysis"? I just did and there are many good links. Whether these are helpful, only you would know. I can't post links here, otherwise I would. Good luck.
10. ### math

x = hourly rate 40x + 12x = 520 Solve for x
11. ### Algebra

Symmetric to y-axis if an equivalent equation is obtained when x is replaced by -x. It is symmetric to the y-axis, not x-axis.
12. ### Algebra

4y^4 + 24x^2 = 28 Symmetric to x-axis if an equivalent equation is obtained when y is replaced by -y. 4y^4 + 24x^2 = 28 4(-y)^4 + 24x^2 = 28 4y^4 + 24x^2 = 28 Since, the two equations are equivalent, the graph is symmetric to the x-axis. Symmetric to y-axis if an equivalent ...
13. ### Algebra

You need parentheses for the 2nd equation. Is this, y = 1/(x^2 + 5) Or, y = 1/(x^2) + 5
14. ### algebra

-7(x+5)(x+8) Use FOIL to expand (multiply out). What do you not understand?
15. ### math

This is very simple and quick to graph. Have you tried to graph these? What don't you understand?
16. ### math

Tutors do not do your homework. The only way you will learn is by trying to solve these yourself. See your first post/problem below. I worked out one problem in detail. Follow this example to do all these problems. If you get stuck post your work and someone will help you.
17. ### math

See your first post. Follow that example to complete this problem. Same concept, different numbers.
18. ### math

3x - 4y = 22 2x + 5y = 7 To eliminate variable x, Multiply by -2 (3x - 4y = 22) Multiply by 3 (2x + 5y = 7) Add equations -6x + 8y = -44 6x + 15y = 21 0 + 23y = -23 23y = -23 y = -1 To find x, substitute y = -1, in 2x + 5y = 7 2x + 5y = 7 2x - 5 = 7 2x = 12 x = 6 x = 6, y = -1
19. ### Algebra

What is the question?
20. ### arithmetic

Convert to inches, then use a ratio. 5'2' = 62" 3' = 36" 3'5" = 41" 62:36 = x:41 62/36 = x:41 Cross multiply and solve for x.
21. ### Geometry

TU=4x-1, UB=2x-1, TB=5x TU + UB = TB 4x - 1 + 2x - 1 = 5x Solve for x. Substitute the value you find for x in TU (4x - 1) to find the measure of TU.
22. ### Math

f(x) = x^2 + 6x f' = 2x + 6
23. ### Algebra

b^3 = 1331 b = 11 This problem is asking for the cube root of 1331. ( b * b * b = 1331 ?) There is really nothing to solve. Just like the square root of 100. You either know the answer off hand, approximate to get the answer, use trial an error, OR use a calculator.
24. ### Math

Perimeter p = 2w + 2L L = length (you called height) 0.62L = width p = 3' p = 2w + 2L 3 = 2L + 2(0.62L) 3 = 2L + 1.24L Solve for L (height)

26. ### math

x = frogs Jen caught 4x = frogs Lisa caught x + 4x = 25 Solve for x

29. ### algebra

If this is your problem (5x^4 + 3x^2 - 2x) - (-5x^4 - 3x^2 + 9x) Answer is 10x^4 + 6x^2 - 11x
30. ### math

x = number of necklaces 2x = number of earrings 16 + x + 2x = 43 solve for x
31. ### algebra

D = RT 88 = Rate of Train B T = Time of Train B 88T = Distance of Train B 80 = Rate of Train A T + .5 = Time of Train A (8:40 - 8:10 = 30 min = .5 h) 80(T + .5) = Distance of Train A Since distances are equal 80(T + .5) = 88T 80T + 40 = 88T 8T = 40 T = 5 Train B will catch up ...
32. ### math

What do you mean last step? That is the answer. You can't add -1/4 + (sqrt(3))/4
33. ### Algebra-still need some help

Is this a question?
34. ### Algebra-still need some help

For the domain, the denominator can't equal zero. -2x - 5 = 0 -2x = 5 x = -5/2 So, x cannot equal -5/2 All x not equal to -5/2 For the numerator, you cannot have a negative inside the square root. x + 6 >= 0 x >= -6 All x >= -6
35. ### Math

Please see answer I pasted below. This question was answered by Damon yesterday (and today, at least once already). math - Damon, Wednesday, February 2, 2011 at 7:40pm 1 1 1 1 1 2 1 1 3 assuming at least 3 greeting card choices
36. ### math

The question is? 4x + 5 + 29 = 4x + 34
37. ### math

x = size of woman's head 8x = size of man's head 8x = 50 x = ?
38. ### Perimeter and area

w = width = 9, L = length Area = Lw 81 = 9L L = 9 Perimeter P = 2w + 2L w = 9, L = 9 P = 2(9) + 2(9) P = ?
39. ### algebra

Are you adding these two equations? If so, 5x^4 + 3x^2 - 2x -5x^4 - 3x^2 + 9x ------------------- 0 + 0 + 7x The answer is 7x
40. ### math

Link doesn't work. There is a space after the last /.
41. ### Math

(5x^2 - 4x)(3x^2 + 2x) Use FOIL to expand -8x^2 - 2x^3 + 15x^4 15x^4 - 2x^3 - 8x^2
42. ### functions

Functions? This is a geometry problem. The ladder up against the wall forms a right triangle. x = base x + 5 = opposite side 18 = hypotenuse Using the Pythagorean theorem, x^2 + (5 + x)^2 = 18^2 Solve for x 5 + x = how far up the blding the ladder reaches.
43. ### geometry

xz = 72 xy = 5x + 3 yz = 8x - 9 5x + 3 + 8x - 9 = 72 13x - 6 = 72 13x = 78 x = 6 So, for y to be the midpoint of xz, xy = yz 5x + 3 = 8x - 9 x = 6 5(6) + 3 = 8(6) - 9 30 + 3 = 48 - 9 33 not = 39 y is not the midpoint
44. ### Math

You're welcome :)
45. ### Math

Plan A: Salary \$750 + .10 of sales Plan B: Salary \$1,000 + .08 of sales > \$2,000 x = dollar amt of sales 750 + .10x > 1000 + .08(x - 2000) 750 + .10x > 1000 + .08x - 160 750 + .10x > 840 + .08x 0.02x > 90 x > 4500 Plan A better when sales > \$4500
46. ### geometry

Not enough info. I don't have the figure to look at. Where is JN? Where is JL? Where is KL? Is this a triangle, a square, etc? Without a detailed description, your question cannot be answered.
47. ### Math

52/16 = 105/28 The concept is the same as reducing fractions. Do you know how to reduce fractions? Example: 6/12 = 1/2 in lowest terms 25/15 = 5/3 in lowest terms This is what you need to do to your problem.

Please see answer I pasted below. This question was answered by Damon yesterday. math - Damon, Wednesday, February 2, 2011 at 7:40pm 1 1 1 1 1 2 1 1 3 assuming at least 3 greeting card choices
49. ### algebra 1

x = miles Candice drove 2x = miles Marcus drove x + 2x = 66 = miles driven together 3x = 66
50. ### algebra

FYI-"algabra" is not how you spell algebra. 3x^2- 12x - 24 = 0 This equation cannot be solved by factoring. Use the Quadratic Formula, or the method of completing the square. Here is the quadratic formula. x = (-b +- (sqrt(b^2 - 4ac)))/2a 3x^2 - 12x - 24 = 0 a = 3, b...
51. ### Math

You question is not clear. Are all these age problems based on the 10 year old, 55 year old and 75 year old or are these separate problems? Are these ages three different people? For example, "at my age of 55, in years, how old was the older person of 75 when I was born?&...

53. ### physics

See the 3rd link below under Related Questions. A similar question was answered for (a).
54. ### math

6 = 14 - 2x add -14 to both sides 6 + -14 = 14 + -14 - 2x -8 = -2x Divide both sides by -2 -8/-2 = -2x/-2 4 = x x = 4

56. ### math

Pay attention. Do as many practice problems as you can a night. If you do not understand a certain math concept, ask for help. Practice, study and repeat as needed.
57. ### math

D = RT (Distance = Rate x Time) R = D/T 35 min = .58 hour (35/60) D = 25 mi, T = .58 h R = 25/.58 = 43.10 mph to nearest mph = 43 mph
58. ### math

Don't listen to emma. She/he is wrong.
59. ### math

22-2[5+3(6-1)] Remove the inner most parentheses first 22-2[5+3(5)] Perform the inner most multiplication next 22 - 2[5 + 15] Do addition inside parentheses 22 - 2(20) Perform theultiplication 22 - 40 Subtract -18
60. ### physics

You're welcome :)
61. ### physics

See first link below under Related Questions. A very similar problem was answered.
62. ### math

5z+10(-z+14)=95 5z - 10z + 140 = 95 -5z = -45 z = ?
63. ### alg and trig

If you mean, (you should use parentheses) 6x^3-5x^2+15x+5 / (2x^2-x+3) Use polynomial long division, Here's the answer to check to your long division, 6x^3 - 5x^2 + 15x + 5/(2x^2 - x + 3)
64. ### math

If you mean, (5x^3 * y^4)/(14x^5 * y^-8)= 5y^12/(14x^2)
65. ### algebra

Your problem is not clear. What are you dividing?

20 + 40 = 60
67. ### math

Square X, s = side Area, A = s^2 100 = s^2 Take square root of both sides 10 = s Square X, s = side Perimeter, P = 4s s = 10 P = 4(10) P = 40 Square Y, s = side Perimeter of Sq. Y = 1/2 Sq. X Perimeter of Sq X = 40, P = 1/2 (40) = 20 P = 4s 20 = 4s s = 5 Square Y, side = s ...
68. ### math

Yes, Damon is right. A(5) is the total value. I meant to put, \$18,500 + 4610.26 Interest = \$23,110.26 after 5 years
69. ### math

\$18,500 at 4.5% compounded semiannually for 5 years A(t) = P(1 + r/n)^nt A(5) = 18500(1 + 0.045/2)^(2(5)) A(5) = 18500(1 + 0.0225)^10 A(5) = 18500(1.0225)^10 A(5) = 18500(1.24920) A(5) = 23110.26 interest 18,500 + I = total value after 5 yrs
70. ### Algebra

f(x)=(4x-1)/(x+7) y = (4x-1)/(x+7) Rewrite as: y = (4x)/(x+7)- 1/(x+7) Multiply both sides by x+7: (x + 7)y = 4x - 1 Expand out terms of the left hand side: xy + 7y = 4x - 1 xy - 4x = -7y - 1 x(y - 4) = -7y - 1 Divide both sides by y - 4: x = (-7y - 1)/(y - 4) f^-1 = (-7x - 1...
71. ### Math geometry

A line that bisects an angle divides it into two congruent parts. So if ray AH bisects <GAB, then angle GAH = angle BAH ? You are saying <GAH is acute and <BAH is obtuse? Does the problem state ray AH bisects <GAB or are your looking at a picture and YOU are making...

73. ### Algebra

Ignore my answer. I did not notice that one measurement is in feet. I compared inches to feet, which you cannot do.
74. ### Algebra

Set up a ratio. 10 : 100 = 10/100 = 1/10 The model is 1/10 the size of the Endeavour.
75. ### ,Math 7

You're welcome :)
76. ### ,Math 7

Question 2 You are correct. Megan starts with \$24.75. She should leave at 11:15. Look at the part under question 4 ABOVE where I say "To check this".
77. ### Algebra- is my answer right

The answer is 2 < x < 4 I don't know how to solve this. I have tried various web sites for help. I used an online calculator for the answer but the calculator does not have the steps to solve. I've been trying this since you posted yesterday. Hoping a math tutor ...
78. ### math

y = 10h if h = number of hours worked then, \$10
79. ### Math geometry

You're welcome :)
80. ### Math geometry

The midpoint of BC is M(-10,-16) B(-1,8) C = ? xm = 1/2(x1 + x2), ym = 1/2(y1 + y2) -10 = 1/2(-1 + x2) -20 = -1 + x2 -19 = x2 -16 = 1/2(8 + y2) -32 = 8 + y2 -40 = y2 C(-19, -40) check my math

Set-up equations 1) x - 7 + 3 + 6 - 8 + 1 - 6 = 3 x + 10 - 21 = 3 x - 11 = 3 x = 13 2) x - 12.00 + 15.00 - 7.00 - 8.50 + 8.00 + 2.00 = 22.25 You solve 3) Miguel x + 15 - 4 + 6 - 17 + 22 + 14 = 40 Yoshi x + 12 - 4 + 33 - 7 = 40 You solve 4) 3:35--plane 2:00--less 2h 1:35--check...
82. ### math

Arithmetic sequence a, a + d, a + 2d, a + 3d, ...a +(n - 1)d 1)a3 = 10, a7 = 20 Since these are 4 places apart (7 - 3 = 4) a7 = a3 + 4d 20 = 10 + 4d 10 = 4d d = 10/4 = 2.5 So, the common difference, d = 2.5 To find the 1st term a, a3 = a + 2d 10 = a + 2(2.5) 10 = a + 5 a = 5 2...
83. ### algebra

3x^3-2x^2y-8xy^2 x(3x^2 - 2xy - 8y^2) x(x - 2y)(3x + 4y)
84. ### Psych

I think Ms. Sue said this. Where are the quotes?

Is this a test? The tutors will not complete your homework for you. The tutors will check or offer comments on YOUR work.
86. ### Algebra

This isn't a question. This is a statement, telling you why a solution to a word problem should be checked to the original wording of the problem versus the equation written for the problem. This is because the equation, derived from the wording of the problem, could be ...
87. ### algebra

If x = -70 -x = 70 Think of '-' meaning -1 -1x = 70 Divide both sides by -1 -1x/-1 = 70/-1 x = -70
88. ### Math

You're welcome :)
89. ### Math

80% = 30 .80x = 30 x = 30/.80 x = 37.5 total games 20% of 37.5 = 7.5 games lost 30 wins 7.5 lost 37.5 total games Not sure what you are trying to do in Excel.
90. ### Physics

See links below under Related Questions. This almost exact problem was answered.
91. ### Algebra

the quotient of 12 and the number, x 12/x = quotient x = -3 12/-3 = ?
92. ### Calculus

A ball is shot straight up into the air with initial velocity of 47 ft/sec Free fall, s in ft, t in sec s = s0 + v0t - 16t^2 height, s0 = 0 velocity, v0 = 47 s = 0 + 47t - 16t^2 s = 47t - 16t^2 Instantaneous velocity, v v = ds/dt = v0 - 32t v = 47 ft/sec v = 47 - 32t To find ...
93. ### Math

360 deg = 1 revolution 1 min = 60 sec 120/360 = 1/3 rev/sec 1/3 per/s * 60 sec/min = ?
94. ### College Algebra

3x^2- 12x - 24 = 0 Solve the quadratic equation by completing the square: Divide both sides by 3: x^2 - 4x - 8 = 0 Add 8 to both sides: x^2 - 4x = 8 Add 4 to both sides: x^2 - 4x + 4 = 12 Factor the left hand side: (x - 2)^2 = 12 Take the square root of both sides: |x - 2| = 2...
95. ### MATH

Please don't type in all caps. It is rude. On the internet, all caps is equivalent to shouting. 21x^7 and 147x^9 LCM is 21x^7
96. ### geometry

You need to draw right triangle ABC. Angle A (vertex angle) = 3 deg side b (base) = 60 mi side c = hypotenuse side a (distance of climb) = unknown tan A = op/hyp = a/b = a/60 tan 3 = a/60 0.0524 = a/60 60(0.0524) = a 3.144 mi = a So the plane climbed 3.144 miles To find how ...
97. ### Calc

Looks good to me!
98. ### calculus

x^2/(x+1) dx | = integration symbol |x^2/(x + 1) dx Using long divsion |x - 1 + 1/(x + 1) dx |x dx - |1 dx + |1/(x + 1) dx 1/2 x^2 - x + ln |x + 1| + C