Tuesday
July 26, 2016

Posts by Helper

Total # Posts: 1,781

Chemistry
could you explain me this one A photon interacts with a ground state electron in a hydrogen atom and is absorbed... And I will explain you the formula
January 11, 2013

PreCalculus - Find Inverse
replace f(x) with x and x^3 with y^3 in the equation and then solve for y ... Hope that helps !!
November 27, 2012

physics help needed very urgent !!!
The block in the figure below lies on a horizontal frictionless surface and is attached to the free end of the spring, with a spring constant of 55 N/m. Initially, the spring is at its relaxed length and the block is stationary at position x = 0. Then an applied force with a ...
October 26, 2012

Science
You have a stock solution of 3.5M glucose. You need a working solution of 0.5M glucose in a volume of 400ml. Explain how you make the solution. Also what is the concentration of the dilution solution?
October 15, 2012

S.S
Thanks Shawn Mendes is bae! lol
October 10, 2012

English
Lacey was right!(:
May 13, 2012

child development
3 is A 5 is C 9 is A 10 is B 11 is C Those are right because I did this test already. :) The ones I didn't mention already have the right answer.
April 24, 2012

physics
the output will decrease
April 11, 2012

math
I dunno, but maybe u can help me!
March 1, 2012

Science
You are correct,the answer is B. Good job :)
February 1, 2012

trig
58!! I'm workin on it too! LOL! See you in class!
December 13, 2011

Proof read please
You have to get involved!� From the first day of school, freshman year of high school, those were the words that constantly fell from my mom�s mouth. I would not go a week without hearing those five words. At that time I did not ...
October 15, 2011

Physics
it is based off the equation: displacement = (initial velocity)*(change in time) + 1/2(acceleration)*(change in time squared) since that equation is linear, the equation recommended for this problem is: "angle" = 0 + 1/2(acceleration)*(change in time squared) that is...
October 7, 2011

algebra
Say, cost per day = D Say, cost per km = k 3D + 150k = 180 2D + 400k = 180 Multiply the first equation by 2 and the second by 3: 6D + 300k = 360 6D + 1200k = 540 Subtract the first equation from the second: 900k = 180 Divide both sides by 900: k = 0.2 2D + 400k = 180 2D + 400(...
September 29, 2011

Algebra
There are no like terms. It cannot be simplified.
September 29, 2011

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)
September 29, 2011

arithmetic
ANSWER: 65 Substitute 30 into n: 7 + (30 - 1) x 2 7 + (29) x 2 7 + 58 = 65
June 29, 2011

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...
June 23, 2011

english
He had planned to take the last flight out to Chicago. However, the flight was cancelled due to bad weather.
June 2, 2011

american history
There are no statements listed :)
June 2, 2011

life orientation
Can you please post lines 10-15 or the passage you are implying to :)
June 2, 2011

Title for essay
I agree with Ms.Sue second title!
May 19, 2011

math
there are 3 ft in 1yd. 555ft/3ft=X yd/1yd 555ft=3xft divide =185 yards
May 8, 2011

geometry
Surface area of what? Cylinder, cone, sphere or ?
April 23, 2011

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.
April 22, 2011

Social Studies
See link. http://en.wikipedia.org/wiki/Albany_Plan
April 21, 2011

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
March 15, 2011

algebra 1
Try this link. http://www.algebra-class.com/dividing-monomials.html
March 15, 2011

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. ...
March 9, 2011

Logarithms
Thanks so much Reiny.
March 9, 2011

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 ...
March 9, 2011

Math 126
Arithmetic, the common difference is 11. 15 - 4 = 11 26 - 15 = 11 37 - 26 = 11 48 - 37 = 11 59 - 48 = 11
March 7, 2011

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
March 4, 2011

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
March 4, 2011

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
March 4, 2011

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.
March 4, 2011

math
Master is incorrect f(x) = 7 ln x f' = 7/x f'(4) = 7/4
March 3, 2011

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...
March 3, 2011

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
March 3, 2011

Algebra 2 word problem
Correct :)
March 2, 2011

math
You're welcome :), we all make mistakes.
March 2, 2011

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%
March 2, 2011

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?
March 1, 2011

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...
March 1, 2011

Math
W = width W + 42 = length P = 2W + 2L 228 = 2(W) + 2(W + 42) Solve for W W + 42 = Length
March 1, 2011

Math
x = hrs farming y = hrs babysitting 10x + 5y >= 150 x + y <= 25 Solve the system
March 1, 2011

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?
March 1, 2011

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
March 1, 2011

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?
March 1, 2011

Geometry-Please check my answers
Both your answers are correct.
March 1, 2011

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)
March 1, 2011

Geometry-Please check
http://www.jiskha.com/display.cgi?id=1299028007
March 1, 2011

calculus
Ignore my response. I completely misunderstood the question.(:
March 1, 2011

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.
March 1, 2011

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 ...
March 1, 2011

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 ...
March 1, 2011

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...
March 1, 2011

geometry
See this post. Only the side length is different. Same method is used. http://www.jiskha.com/display.cgi?id=1298927532
March 1, 2011

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 ...
February 28, 2011

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...
February 28, 2011

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
February 28, 2011

Algebra 1
You're welcome :)
February 28, 2011

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 ...
February 28, 2011

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/...
February 28, 2011

Math 10+
Or, do you mean 2^(-3) = 1/(2)^3 = 1/8
February 28, 2011

Math 10+
1/8 = 0.125 x^(0.125)
February 28, 2011

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)) = ?
February 28, 2011

algebra-Ann edit your problem
What is ã ?
February 28, 2011

algebra-Edit your problem
What is ã ?
February 28, 2011

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!
February 28, 2011

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...
February 28, 2011

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.
February 28, 2011

maths
Is this what you don't understand? 45% = 45/100 = 0.45
February 28, 2011

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)
February 28, 2011

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)
February 28, 2011

geometry
What is the figure and where are these segments? (AB, BC, AD, CD) located on this figure?
February 28, 2011

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...
February 28, 2011

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 ...
February 28, 2011

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 ...
February 28, 2011

algebra 2--duplicate problem
Answered below.
February 27, 2011

algebra 2
6r^2 + 13rd + 6d^2 (3r + 2d)(2r + 3d)
February 27, 2011

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?
February 27, 2011

Math(Urgent)
Yes, your derivative is correct.
February 27, 2011

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) - ...
February 27, 2011

Mathematics
16 oz = 1 pound 16.5 lbs * 16 oz/lb = 264 oz Each paper = 0.55 oz 264/0.55 = ? number of papers
February 27, 2011

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
February 27, 2011

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
February 27, 2011

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
February 27, 2011

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-...
February 27, 2011

college algebra
135 = 12.5(0.2t - 1) + 19t Solve for t
February 27, 2011

math-calc
As typed, without parenthesis f(x) = x/x + 1 f' = 0
February 27, 2011

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
February 26, 2011

algebra-Ann please edit your problem
What is "3ã" ? And please use parentheses if necessary.
February 25, 2011

math
See link. This exact problem was solved there. http://www.jiskha.com/display.cgi?id=1236980230
February 25, 2011

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.
February 25, 2011

college algebra-Ann, edit your problem
What is "4ã" ? And please use parentheses if necessary.
February 25, 2011

algebra-Mike, edit your problem
What is "3ã" Please use parentheses if necessary.
February 25, 2011

algebra-Mike, edit your problem
What is "5ã" Please use parentheses if necessary.
February 25, 2011

algebra-Mike, edit your problem
What is "3ã" ? Please use parentheses if necessary.
February 25, 2011

math
3yrs OLDER than his brother, so you would add + 3 B. 2b + 3
February 25, 2011

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