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February 7, 2016

Posts by Helper

Total # Posts: 1,755

Calculus
I used r = 2/3 instead of r = 2/3 h! Thanks so much REINY. I really appreciate you taking the time to explain this to me. I am teaching myself calculus, and sometimes the book just doesn't explain things well. The r = 3h/4.5 threw me at first, until I figured out what she ...
February 6, 2011

Calculus
I think you have a mistake. I was working on this problem at the same time. V = 1/3 pi r^2 h Only 'r' is squared. It appears that you squared 'h' too. V = 1/3(pie) (3/4.5h)^2 Anyway, even with squaring h too, I don't come up with 9/64 pi.
February 6, 2011

math
You can leave the same and then subtract the equations. I like to have one equation as addition (+)variables and one equation with negative variables. Then I can add the equation. I know that I am less apt to make a mistake when adding equations as opposed to subtracting ...
February 6, 2011

math
5(7x + 3y = -1.5) = 35x + 15y = -7.5 3(2x - 5y = -30.3) = 6x - 15y = -90.9 35x + 15y = -7.5 6x - 15y = -90.9 Add two equations 41x + 0 = -98.4 41x = -98.4 x = -2.4 7x + 3y = -1.5 x = -2.4 7(-2.4) + 3y = -1.5 -16.8 + 3y = -1.5 3y = 15.3 y = 5.1 x = -2.4, y = 5.1
February 6, 2011

math
Multiply 1st equation by 5, and the 2nd equation by 3. Then add the two equations. This will eliminate the y variable. Take the value you get for x and substitute that value in either equation and solve for y.
February 6, 2011

Math
X = 2 + (1/x) Multiply both sides by x Xx = 2x + 1 Divide both sides by X x = (2x + 1)/X Now, you do the other problem. It's done the same way.
February 6, 2011

Calculus
x = distance of man from base of light y = length of shadow y/(y+x) = 6/18 Solve for y 18y = 6(y + x) 18y = 6y + 6x 12y = 6x y = 6/12 x = 1/2 x Find dy/dx of 1/2 x dy/dx = 1/2 Find derivative with respect to t dy/dt = 1/2 dx/dt x is increasing 3 ft/sec dx/dt = 3 ft/sec dy/dt...
February 6, 2011

math
40 kilometers = 24.8 miles 40 meters = 131.23 feet 4 meters = 13.12 feet 40 cm = 1.31 feet Can you answer now?
February 6, 2011

Math
After 6 yrs, the house decreased. The gains do not offset the losses. After three years the price is down 30% to start with, so the 10% increases are on calculated on a lower value. Do an example. On $50,000, after 6 years the house is down in value approx. 3%.
February 6, 2011

maths
Diameter d = 20 cm Circumference C = pi * d C = 3.14 * 20 = 62.8 cm in one revolution 62.8 cm 100 cm = 1m 62.8/100 = 0.628 m 0.628 m in one revolution 1 km = 1000 m 1000/0.628 = 1592.36 revolutions
February 6, 2011

New Age Math
The two equations, based on your fill-in-the-blanks above are, 25x + 35y + 54z = 8277 x + y + z = 236 Are you sure this is the exact problem as written? Are far as I know, this problem cannot be solved to get an exact number for x, y and z . To solve simultaneous equations in ...
February 6, 2011

math
Triangle ABC AB = x BC = x - 4 AC = 10 angle BAC = 60 deg Using Law of Cosines a^2 = b^2 + c^2 - 2bc cos A (x -4)^2 = 10^2 + x^2 - 2(10)(x)cos 60 x^2 - 8x + 16 = 100 + x^2 - 20x (0.5) x^2 - 8x + 16 = 100 + x^2 - 10x 2x = 84 x = 42
February 6, 2011

geometry
A = 1/2 bh h = altitude h + 4 = base 16 = 1/2 (h + 4)h Solve for h
February 6, 2011

math
Is this your problem? log 10 (1.4 * 10^(-5))
February 6, 2011

Algebra
D = RT, T = D/R 69 = Suzi Rate T = Suzi Time 69T = Suzi Distance 41 = Jim Rate T + 2.73 = Jim Time (T = 112/41 = 2.73) 41(T + 2.73) = Jim Distance Since distances are equal 69T = 41(T + 2.73) 69T = 41T + 111.93 28T = 111.93 T = 3.99 = 4 69T = Suzi Distance 69(4) = 276 miles
February 6, 2011

Algebra
jai's answer is NOT correct -0.075t + 3.85 < 3.7 Add -3.85 to both sides -0.075t + 3.85 + -3.85 < 3.7 + -3.85 -0.075t < -0.15 Divide both sides by -0.075 When dividing by a negative the sense of the inequality reverses t > 2
February 6, 2011

bus math
Loan is $50,000 at 9% for 7 years. Calculate Monthly Payment P = iA/(1 - (1 + i)^-N P = payment amount (per month) i = Interest Rate = 0.09/12 = 0.0075 A = Loan amount = 50,000 N = number of payments = 84 P = 0.0075(50,000)/(1 - (1+0.0075)^-84) P = 375/(1 - (1.0075)^-84) P = ...
February 6, 2011

bus math
Is this simple interest or compounded? If compounded, how? Yearly, quarterly, annually ?
February 6, 2011

ENGLISH HS
I would think you should be more professional. Something along the lines of, Good afternoon, Accounting department, Susan Smith (maybe mention from ABC Corp?)speaking. How may I help you? Maybe not this exactly, but you get the idea. The ending can be simple. It was nice ...
February 6, 2011

Calculus
What is "0 ¡Ü t ¡Ü" ? What is "¡Ü t ¡Ü ¡Þ"? Please check questions after posting. Tutor's can't help if they do not understand the symbols you are using.
February 6, 2011

arithmetic
The nth term of an arithmetic progression is defined by n = a + (n-1)d where, n = the nth term a = the first term d = the common difference Therefore, 58 = 10 + (13 - 1)d 48 = 12d d = 4
February 6, 2011

Calculus
What is "c in 0 ¡Üc¡Ü 1" ? You should always check your question after posting. A tutor can't help if they cannot understand your 'symbols'.
February 5, 2011

math
1.) 9 more than 1/2 the number no more than -8. n = number n + 9 = nine more 1/2 n = half the number no more than -8 (means) <= -8 1/2 n + 9 <= -8 1/2 n <= -17 Multiply both sides by 2 n <= -34 number is 34 (less than or equal -34) 2.) h hours at rate of 55 mi/hr D...
February 5, 2011

math
What is your problem? 2 to 4th power x 2 -2 ? Is this your problem? 2^4 * 2^(-2) If so, 2^4 = 16 2^(-2) = 1/(2^2) = 1/4 2^4 * 2^(-2) = 16 * 1/4 = 16/4 = 4 4 = 2^2
February 5, 2011

math
30 >= -6(5-x) 30 >= -30 + 6x 60 >= 6x 10 >= x x <= 10
February 5, 2011

math
See your later post.
February 5, 2011

algebra
y = 20, 17, 14, 11 x = 1, 2, 3, 4 change in y-- 17 - 20 = -3 14 - 17 = -3 11 - 14 = -3 change in x-- 2 - 1 = 1 3 - 2 = 1 4 - 3 = 1 Slope m = y difference/x difference m = -3/1 = -3 y = mx + b To find b using point (1,20) m = -3 20 = -3(1) + b 20 = -3 + b b = 23 Therefore, the ...
February 5, 2011

algebra
a^6-729 = (a-3)(a+3)(a^2-3a+9)(a^2+3a+9)
February 5, 2011

algebra
x = number of hours 45 + 30x < 25 + 35x Solve for x
February 5, 2011

algebra
Your question is? This can be factored. r^2+ 11r + 30 = 0 (r + 6)(r + 5) = 0 r = -6, r = -5
February 5, 2011

algebra
What is your question?
February 5, 2011

algebra
(bc^2)-^2 Do you mean, (bc^2)^-2 (bc^2)^-2 = b^-2 c^-4 = 1/(c^4 b^2)
February 5, 2011

college algebra
-x^7,-7x^3,-35x^6 GCF = x^3
February 5, 2011

college algebra
6x^3 - 6x^2- x + 1 This can be factored without grouping? (x - 1)(6x^2 - 1)
February 5, 2011

algebra-college
Do you mean (-5x^2)^2 ? If so, (-5x^2)^2 = (-5)^2 x^4 = 25x^4
February 5, 2011

Trigonometry
B = 100, b = 60 < a = 100 When the given angle is obtuse, and the side opposite the given angle is less than or equal to the other given side, there is no solution.
February 5, 2011

Calculus
My question is, What is x 3 -b ? Is this what you mean (5/2)x^3 - b?
February 5, 2011

Calculus
What is your question? "(5/2) x 3-b" What does this represent or mean?
February 5, 2011

math
Perimeter p, w = width, L = length P = 2w + 2L In this case. P = w + 2L w = 10, L = 15 P = 10 + 2(15) P = ?
February 5, 2011

Algebra
Sorry, I forgot the last step. r = +- (sqrt(C/W))
February 5, 2011

Algebra
W = Cr^-2 W = C * 1/r^2 Multiply both sides by r^2 r^2 W = C r^2 = C/W
February 5, 2011

army public
Please put your school subject in the School Subject box. +5 - 2 = +3 per day x = number of days 3x = 20 x = 6.67 days or 7 days
February 5, 2011

Geometry
Please put your school subject in the School Subject box. In a scalene triangle, all sides are unequal.
February 5, 2011

algebra
If this is your problem, (1.5x^3 + 4.8x^2 - 3.7x) - (-4.3x^3 - 4.5x^2 + 32) 5.8 x^3 + 9.3 x^2 - 3.7 x - 32
February 5, 2011

algebra
If you mean, u^(-8) = 1/(u^8)
February 5, 2011

algebra
If your problem is, 54r^(14)/(-3r^7) = -18r^7
February 5, 2011

math
26.000 less 5,000 = 21,000 loan 11% for 36 months A = P * (r * (1 + r)^n)/((1 + r)^n - 1) A = Payment amount/period P = Loan amount = 21,000 r = interest rate = .11/36 = 0.003056 n = number of payments = 36 A = 21,000*(0.003056*(1 + 0.003056)^36 / ((1 + 0.003056)^36 - 1) A = ...
February 5, 2011

Math 156
A rectangle has 4 right angles. I don't know what "four right sides" mean. If you mean right angles, the correct wording would be "four right angles".
February 5, 2011

MATH
x = number of days y = 110 - 2.75x
February 5, 2011

Math
You're welcome :)
February 5, 2011

Math
Solve for ? Solving for x, 6x + 5y = 15 6x = 15 - 5y x = (15 - 5y)/6 Solving for y, 6x + 5y = 15 5y = 15 - 6x y = (15 - 6x)/5
February 5, 2011

Math(Please check)
No, you are not correct. But, you almost had it! To compute the actual increase in profit, first plug in 5, then plug in 6. The difference between f(5) and f(6) is the actual. p(x)= 3x^2 - 5x + 2 p(5) = 3(5)^2 - 5(5) + 2 = 52 p(6) = 3(6)^2 - 5(6) + 2 = 80 p(6) - p(5) = 80 - 52...
February 5, 2011

Math(Please check)
y=sqrt 2x^2 +1 at the point (2,3). No, you are not correct. First, you need to find the derivative of, (sqrt(2x^2 + 1)) dy/dx = 2x(2x^2 + 1)^(-1/2) This is the slope of the tangent line at P. Now plug in P(2,3) 2x(2x^2 + 1)^(-1/2) 2(2)(2(2^2) + 1)^(-1/2) 4(8 + 1)^(-1/2) 4 * (9...
February 5, 2011

Math
dy/dx 2x^(1/2) 2 * 1/2 x^(1/2 - 2/2) 2/2 x^(-1/2) = x^(-1/2) = 1/(sqrt(x))
February 5, 2011

math
Correct
February 5, 2011

math
Correct
February 5, 2011

intermediate algebra
Correct
February 5, 2011

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
February 5, 2011

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 ...
February 5, 2011

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.
February 4, 2011

algebra
3³+53*(39)-(2+5*9) 27 + 2067 - (2 + 45) 2094 - 47 = 2047
February 4, 2011

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.
February 4, 2011

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.
February 4, 2011

math
x = hourly rate 40x + 12x = 520 Solve for x
February 4, 2011

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.
February 4, 2011

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 ...
February 4, 2011

Algebra
You need parentheses for the 2nd equation. Is this, y = 1/(x^2 + 5) Or, y = 1/(x^2) + 5
February 4, 2011

algebra
-7(x+5)(x+8) Use FOIL to expand (multiply out). What do you not understand?
February 4, 2011

math
This is very simple and quick to graph. Have you tried to graph these? What don't you understand?
February 4, 2011

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.
February 4, 2011

math
See your first post. Follow that example to complete this problem. Same concept, different numbers.
February 4, 2011

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
February 4, 2011

Algebra
What is the question?
February 4, 2011

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.
February 4, 2011

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.
February 4, 2011

Math
f(x) = x^2 + 6x f' = 2x + 6
February 4, 2011

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.
February 4, 2011

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)
February 4, 2011

math
See your 1st post
February 3, 2011

math
x = frogs Jen caught 4x = frogs Lisa caught x + 4x = 25 Solve for x
February 3, 2011

COLLEGE ALGEBRA
Please don't repost without checking your 1st post for an answer. See your post below.
February 3, 2011

COLLEGE ALGEBRA
Answered below.
February 3, 2011

algebra
If this is your problem (5x^4 + 3x^2 - 2x) - (-5x^4 - 3x^2 + 9x) Answer is 10x^4 + 6x^2 - 11x
February 3, 2011

math
x = number of necklaces 2x = number of earrings 16 + x + 2x = 43 solve for x
February 3, 2011

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 ...
February 3, 2011

math
What do you mean last step? That is the answer. You can't add -1/4 + (sqrt(3))/4
February 3, 2011

Algebra-still need some help
Is this a question?
February 3, 2011

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
February 3, 2011

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
February 3, 2011

math
The question is? 4x + 5 + 29 = 4x + 34
February 3, 2011

math
x = size of woman's head 8x = size of man's head 8x = 50 x = ?
February 3, 2011

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 = ?
February 3, 2011

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
February 3, 2011

math
Link doesn't work. There is a space after the last /.
February 3, 2011

Math
(5x^2 - 4x)(3x^2 + 2x) Use FOIL to expand -8x^2 - 2x^3 + 15x^4 15x^4 - 2x^3 - 8x^2
February 3, 2011

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.
February 3, 2011

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
February 3, 2011

Math
You're welcome :)
February 3, 2011

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
February 3, 2011

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.
February 3, 2011

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