Sunday

February 7, 2016
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*