# Posts by helper

Total # Posts: 1,867

**algebra**

Say Aarons age = 2A years Therefore, Half of Aarons age = A years Therefore, Tanya's age = A+10 2A + A+10 = 55 3A + 10 = 55 3A + 10 -10 = 55 - 10 3A = 45 A = 15. Therefore, Tanya is 15 + 10 = 25 years old. (Aaron is 2 x 15 = 30 years old)

**arithmetic**

ANSWER: 65 Substitute 30 into n: 7 + (30 - 1) x 2 7 + (29) x 2 7 + 58 = 65

**Maths C**

To solution is in the idea that Simpson's rule requires an even number of intervals and uses parabola capped trapezoids created by three points. Weddle's rule works accurately for more than 7 and odd numbers of intervals. Good luck in indentifying the derivation of the...

**english**

He had planned to take the last flight out to Chicago. However, the flight was cancelled due to bad weather.

**american history**

There are no statements listed :)

**life orientation**

Can you please post lines 10-15 or the passage you are implying to :)

**Title for essay**

I agree with Ms.Sue second title!

**math**

there are 3 ft in 1yd. 555ft/3ft=X yd/1yd 555ft=3xft divide =185 yards

**geometry**

Surface area of what? Cylinder, cone, sphere or ?

**Cultural Diversity**

YOU are not a nice person. Ms. Sue is very helpful and one of the nicest tutors here. I hope that the administrator of this site blocks you from ever posting here again.

**Social Studies**

See link. http://en.wikipedia.org/wiki/Albany_Plan

**geometry**

Your question, I assume, is to find the length and width of the rectangle? The diagonal creates 2 right triangles. L = length L - 4 = width By the Pythagorean theorem, d^2 = L^2 + (L - 4)^2 20^2 = L^2 + (L - 4)^2 Solve for L, the length width = L - 4

**algebra 1**

Try this link. http://www.algebra-class.com/dividing-monomials.html

**Logarithms**

Now, I feel stupid. I guess I should not work so late at night. I tried all these rules when all I needed to do was simplify log2√2 using the basic definition/relationship !! Thanks again. I don't remember learning logs some 40 years ago in HS and teaching myself. ...

**Logarithms**

Thanks so much Reiny.

**Logarithms**

I'm working on logarithmic equations and I'm stuck on how my book arrives at the next step. First, they use the change of base formula on, log(sqrt(2))(x^3 - 2) (sqrt(2)) is the base,changing to base 2 log(sqrt(2))(x^3 - 2)= log2(x^3 - 2)/(log2(sqrt(2)) I understand ...

**Math 126**

Arithmetic, the common difference is 11. 15 - 4 = 11 26 - 15 = 11 37 - 26 = 11 48 - 37 = 11 59 - 48 = 11

**algebra**

How can we answer without looking at the four choices of graphs? See the following in regards to graphing quadratic functions. http://www.purplemath.com/modules/grphquad2.htm

**word problem**

If this is your equation, M = −0.001t^3 + 0.1t^2 t = 14 min Substitute 14 for t and solve M = −0.001t^3 + 0.1t^2 M = −0.001(14)^3 + 0.1(14)^2 Now solve for M = number of words in 14 min

**Math**

This assumes that sides PQ and ST are corresponding sides. You do not state the relation of the sides in your problem. Create a proportion matching the corresponding sides and perimeters. PQ/ST = Perimeter PQR/Perimeter STU 18/6 = 78/x 18x = 468 x = 26 = Perimeter STU

**math**

Multiply the area of the rectangle by the square of the scale factor to get the area of reduced rectangle. Reduced area = 720 * (1/6)^2 Reduced area = 720 * (1/36) Reduced area = 720/6 Reduced area = ? sq in.

**math**

Master is incorrect f(x) = 7 ln x f' = 7/x f'(4) = 7/4

**coordinate geometry**

y - 18x + 18 = 4 Slope-intercept form of the equation is, y = mx + b m is the slope b is the y-intercept You need to put tour equation in the slope-intercept form by solving for y. Move everything to the right side of the equal sign. y - 18x + 18 = 4 y = 4 + 18x - 18 y = 18x...

**geometry**

Not sure I understand your question but I'll give it a try. AB = 4, 2 AB = 2 * 4 = 8 CD = 7 EF = 1 2AB - 1CD = EF 8 - 7 = 1

**Algebra 2 word problem**

Correct :)

**math**

You're welcome :), we all make mistakes.

**math**

Miss Sue, I think you missed the "0" before 45 (0.045 not 0.45) 0.045 = 45/1000 = 9/200 = 0.045 So, the fraction is, 45/1000 = 9/200 (reduced to lowest terms) 0.045 * 100 = 4.5% So, the percent is, 4.5%

**Measurment**

Are 22, 16, and 28 the sides of this triangle? What is "a nine in the middle" mean? What does this "9" represent? Your question cannot be answered as worded. What exactly does your problem say or state to do?

**denominators**

You need to use parenthesis. If this is your problem v/(v+5)+v/3 = -4/(v+5) Multiply both sides by 3(v+5) 3v + v(v + 5) = -12 3v + v^2 + 5v = 12 v^2 + 8v + 12 = 0 (v + 2)(v + 6) v = -6 or v = -2 Make sure you check the solutions in the original equation. I have NOT checked the...

**Math**

W = width W + 42 = length P = 2W + 2L 228 = 2(W) + 2(W + 42) Solve for W W + 42 = Length

**Math**

x = hrs farming y = hrs babysitting 10x + 5y >= 150 x + y <= 25 Solve the system

**algebra**

Parallel lines have equal slopes. Equations in the form y = mx + b m = slope, b = y-intercept Your equation, y = 1/2 x + 2.3 Do you know the slope now?

**math**

Circumference, C = 2 pi r or, C = pi d C = 2 pi r C = 2(3.24)(100) C = 628 feet for one lap 5280 * 2 miles = 10,560 feet 10560/628 = ? = laps in 2 mile

**Math**

tan -120 = (sqrt(3)) = 1.73205 coterminal with 240 deg in QIII so positive reference angle is 60 Where did you get - 0.71312301 Are you using a cal. set to the wrong setting, rads vs degrees?

**Geometry-Please check my answers**

Both your answers are correct.

**Algebra 2**

3x^2 + 1 + (-3x)/(x^2 - 3) Yes, your answer is correct, but I was taught that the remainder is expressed as, (-3x)/(x^2 - 3)

**Geometry-Please check**

http://www.jiskha.com/display.cgi?id=1299028007

**calculus**

Ignore my response. I completely misunderstood the question.(:

**calculus**

I think I read the question wrong. I thought the question wanted the slope of the tangent of f(x) at (1,-5) and the two equations at this point.

**calculus**

y = x^2 - 2 f' = 2x P(1,-5) f' = slope m = 2(1) = 2 Equation of the line tangent at P(1,-5) m = 2 y = mx + b -5 = 2(1) + b -5 = 2 + b b = -7 Equation of the tangent line is, y = 2x - 7 2x - y = 7 Equation of the normal line at P(1,-5) (The normal line is the line that ...

**accounting**

Post your question, but I've noticed that there are not many experts here for accounting questions (depending on the specific question). Depending, I might be able to help, depending on how involved and the specific area involved. Someone might be able to point you in the ...

**Algebra 2**

You have to do polynomial long division. I can't layout the problem here because of the alignment of columns and such. See this website. It explains in detail how to do this. I'll check your answer if you post it. Good luck :) http://www.purplemath.com/modules/polydiv2...

**geometry**

See this post. Only the side length is different. Same method is used. http://www.jiskha.com/display.cgi?id=1298927532

**Algebra 2**

You need parenthesis. I'll assume your problem is, x/(x+1) + 5/x = 1/(x^2 + x) x/(x+1) + 5/x = 1/(x(x + 1)) Multiply both sides by x(x + 1) x^2 + 5(x + 1) = 1 x^2 + 5x + 5 = 1 x^2 + 5x + 4 = 0 (x + 1)(x + 4) = 0 x = -1 or x = -4 Make sure you check both answers in the ...

**calculus**

| = integration symbol | u dv = uv - | v du | arctan(4t) dt u = arctan(4t) du = 4/(16t^2 + 1) dt dv = dt v = t It should look like this, = t arctan(4t) - | 4t/(16t^2 + 1) dt After you set that up, substitute w = 16t^2 + 1 dw = 32t dt 1/32 dw = t dt Then, the integration should...

**math algebra1**

x = Janet's distance to office 2x - 1 = Lynn's distance to office x + 2x - 1 = 8 3x = 9 x = 3 x = 3 mi from Janet's house to office 2x - 1 = 5 miles Lynn's house to office

**Algebra 1**

You're welcome :)

**Algebra 1**

y = height = -16t^2 + 63t + 4 The vertex of this parabola is called the maximum point. Vertex = -b/2a Vertex = -63/(2(-16)) Vertex = t value = 1.96875 So, the maximum value for t seconds is 1.96875 y = height = -16t^2 + 63t + 4 t = 1.96875 y = -16(1.96875)^2 + 63(1.96875) + 4 ...

**math**

Assuming he spent all his money, x = Money he started with 1/3 x = spent on hat 1/6 x = spent on socks 12 = spent on a tie Total spent = 1/3 x + 1/6 x + 12 Total spent = 2/6 x + 1/6 x + 12 Total spent = 3/6 x + 12 Money he started with - Total spent = 0 x - (3/6 x + 12) = 0 6/...

**Math 10+**

Or, do you mean 2^(-3) = 1/(2)^3 = 1/8

**Math 10+**

1/8 = 0.125 x^(0.125)

**math**

The diagonal of a square forms two 45-45-90 triangles. The sides of a 45-45-90 triangle are in the ratio, a : b : hypotenuse x : x : x(sqrt(2)) The diagonal is the hypotenuse of this 45-45-90 triangle. Side = 7 7 * (sqrt(2)) = ?

**algebra-Ann edit your problem**

What is ã ?

**algebra-Edit your problem**

What is ã ?

**Math/ Trade & Cash discounts**

You're welcome! I hope I'm right. :) The problem is so wordy, so at first, I wasn't sure if more was expected. Good luck!

**Math/ Trade & Cash discounts**

1. Looks right. 2. I'm not sure why you subtracted the $7000. first. The problem says 0.18 on orders of at least 22,000 units? 22,000 * 3.00 = 66,000 22,000 * 2.82 = 62,040 66,000 - 62,040 = 3,960 rebate 3960/66000 = 0.06 * 100 = 6% discount 3. 30,000 * 3 = 90,000 30,000...

**Math/ Trade & Cash discounts**

What exactly is your question? You show work and answers for all 4 questions. Are your answers correct? Are you asking for someone to check your work because you don't know if the answers you have listed are correct? You need to ask specific questions.

**maths**

Is this what you don't understand? 45% = 45/100 = 0.45

**algebra**

If this is what you mean, cube root = cr (cr(81)) = (cr(27))*(cr(3)) (cr(81)) = 3*(cr(3)) (cr(81)) = 3(cr(3)) This can be written as 81^(1/3) = 3(3^(1/3)) 81^(1/3) = (3^(3/3)*(3^(1/3)) 81^(1/3) = 3^(4/3)

**Algebra**

(sqrt(xyz))^3 (sqrt(xyz))*(sqrt(xyz))*(sqrt(xyz)) xyz(sqrt(xyz)) This can be written as, ((xyz)^(1/2))^3 = (xyz)^(3/2)

**geometry**

What is the figure and where are these segments? (AB, BC, AD, CD) located on this figure?

**algebra**

Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8). You are given 3 points of the rectangle. You need to find the 4th point. Rectangle ABCD, labeled clockwise from the bottom horizontal segment. A(-0.1, -3.4) B(-7.9, -3.4) C(-7.9...

**algbra**

drwls gave you the equation above. "You therefore have a horizontal line with equation" y = 18.1 points (-6.2,18.1) and (-3.4,18.1) As drwls said above, "The slope is zero and the y-intercept is 18.1." The slope intercept form of an equation is, y = mx + b ...

**geometrY**

Shannon, I'm very sorry. The set-up is wrong (1st line), but the rest is correct. I have no idea where I got that first line. http://member.tripod.com/~BDaugherty/GCSEMaths/shapes.html In the picture, the ratio is T/30 = 2/3 3T = 60 T = 20 Your problem, with the corrected ...

**algebra 2--duplicate problem**

Answered below.

**algebra 2**

6r^2 + 13rd + 6d^2 (3r + 2d)(2r + 3d)

**algebra 2**

6r^2 + 13rd + 6b^2 Cannot be factored. I don't think that is the equation. Are you sure you don't have a couple typos?

**Math(Urgent)**

Yes, your derivative is correct.

**Mathematics**

y = 1/2 x - 2 In the 2nd column all of the points have x = +6 y = 1/2 x - 2 y = 1/2(6) - 2 y = 6/2 - 2 y = 3 - 2 y = 1 Therefore, none of the choices are correct (since none of the points have y = 1). I think you have a typo because if I use x = -6 y = 1/2 x - 2 y = 1/2(-6) - ...

**Mathematics**

16 oz = 1 pound 16.5 lbs * 16 oz/lb = 264 oz Each paper = 0.55 oz 264/0.55 = ? number of papers

**geometrY**

http://member.tripod.com/~BDaugherty/GCSEMaths/shapes.html See the last picture at the bottom of this web page (for a pic of this exact problem). Using ratios, Tree height = T 15/66 = 6.33/T 15T = 512.73 T = 34.182 T = 34.182

**Calculus**

Correction for above, | = integrate symbol y = x^3 y^3 = x, y = x^(1/3) Using the formula pi | (f(x))^2 - (g(x))^2 dx pi | x^(1/3)^2 - (x^3)^2 dx pi | x^(2/3) - (x^6) dx pi ( 3/5 x^(5/3) - 1/7 x^7 ) When I evaluated from 0 to 1, I got, 16/35 pi

**Calculus**

| = integrate symbol y = x^3 y^3 = x, y = x^(1/3) Using the formula pi | (f(x))^2 - (g(x))^2 dx pi | (x^3)^2 - x^(1/3)^2 dx pi | (x^6) - x^(2/3) dx pi ( 1/7 x^7 - 3/5 x^(5/3)) When I evaluated from 0 to 1, I got, - 16/35 pi

**algebra**

Equation passing through the points (2,5) and ( 7,-3) Slope m = (-3 - 5)/(7 - 2) m = -8/5 y = mx + b y = -8/5 x + b Using point, (2, 5) to find b y = -8/5 x + b 5 = -8/5(2) + b 5 = -16/5 + b b = 5 + 16/5 b = 25/5 + 16/5 b = 41/5 y = -8/5 x + 41/5 In the form, y = mx + b b = y-...

**college algebra**

135 = 12.5(0.2t - 1) + 19t Solve for t

**math-calc**

As typed, without parenthesis f(x) = x/x + 1 f' = 0

**ALGEBRA**

http://www.purplemath.com/modules/graphlin.htm I'm not sure of your question. Do you know how to graph an equation? Is it because there are fractions? If because of fractions, convert to decimals and estimate as best you can. Your equation would be, y = -1.6 x + 8.2

**algebra-Ann please edit your problem**

What is "3ã" ? And please use parentheses if necessary.

**math**

See link. This exact problem was solved there. http://www.jiskha.com/display.cgi?id=1236980230

**math**

Please don't repost a question just asked. Be patient for an answer. Tutors volunteer their time and sometimes it can take awhile for your post to be answered. See your original post.

**college algebra-Ann, edit your problem**

What is "4ã" ? And please use parentheses if necessary.

**algebra-Mike, edit your problem**

What is "3ã" Please use parentheses if necessary.

**algebra-Mike, edit your problem**

What is "5ã" Please use parentheses if necessary.

**algebra-Mike, edit your problem**

What is "3ã" ? Please use parentheses if necessary.

**math**

3yrs OLDER than his brother, so you would add + 3 B. 2b + 3

**math**

Which do you think it is? Hint b = brother's age 2b = twice the brother's age

**math**

If you sketch this you will see a right triangle is formed. a = 8 b = 6 c = hypotenuse Use the Pythagorean theorem c^2 = a^2 + b^2 Solve for c, road to Bobby's house

**Calculus 1**

x^7 + y^7 = 8xy 7x^6 + 7y^6 y' = 8y + 8x y' 8x y' - 7y^6 y' = 7x^6 - 8y y'(8x - 7y^6) = 7x^6 - 8y y' = (7x^6 - 8y)/(8x - 7y^6)

**geometry**

Formula for long diameter (vertex to opposite vertex), d = (2 * side length * sin 67.5)/(sin 45) Formula for short diameter (one side to opposite side) d = ((2 * side length)/(sqrt(2))) + side length I'll do short diameter, d = (2 * 48)/(sqrt2)) + 48 d = (96)/(1.4142) + 48...

**calculus**

Like I said, more than one way to do this. I suggest follow Reiny's way.

**calculus**

Thanks Reiny. Nicky, depending on your approach, you need to use both the product rule and the chain rule (more than once). It's easy to get lost in this problem. What exactly do you not understand? Have you tried setting the problem up? One approach, start with the ...

**calculus**

Just making sure. Do you mean e^(8x^4) or e(8x^4) I've never see "e" referred to "exp" on this site, but I haven't been here long.

**calculus**

What is exp?

**math**

48a^2 + 4ab - 140b^2 Factor out 4 4(12a^2 + ab - 35b^2) 4(3a - 5b)(4a + 7b)

**geometry**

What is the figure? Depending on what the figure is, where is AC and BC ?

**math--To MathMate**

In regards to your reply to the problem that Daniel posted (f'(-pi)). I really appreciate you (and Reiny) taking the time to confirm that my answer was correct. I don't usually answer unless I am absolutely sure an answer is correct (I don't want to give wrong ...

**calculus**

All the online integration calculators I tried said that this cannot be integrated. Recheck your problem.

**Math**

80 mg = 0.08 grams 4 tablets x 20mg ea = 80 mg Looks good :)

**MATH(CALCULUS)**

Thank you so much Reiny.

**MATH(CALCULUS)**

Did you find f'(x) first? I just read your earlier post and you said you plugged -pi into 12x/(sinx+cosx) . You have to find f' first, then plug in (-pi). The derivative, f' is, (12(x sin x + sin x - x cos x + cos x)/ (sin x + cos x)^2 Then you plug in (-pi) You ...