Most popular questions and responses by Gray
  1. Algebra

    Salary Increases: A man gets a job of $30000 a year. He promised $2300 raise each subsequent year. Find his total earnings for a 10-year period.

    asked on March 3, 2016
  2. Advanced Algebra

    Depreciation: A construction company purchases a bulldozer for $160,000. Each year the value of the buldozer depreciates by 20% of its value in the preceeding year. Let V sub n be the value of the bulldozer.(Let n=1 be the year the bulldozer purchase.) a.)

    asked on March 6, 2016
  3. Advanced Algebra

    salary increases: A man gets a job with a salary of $30000 a year. He is promised a $2300 raise each subsequent year. Find the total earnings for a 10 year period. Arithmetic Sequence,:

    asked on March 2, 2016
  4. math and music

    How would you go about listing all of the integer ratios? I would like to have the integers listed in ascending order by the product of each integer's numerator and the denominator. This is because in music, more "complex" ratios sound more dissonant.

    asked on December 4, 2010
  5. Differential Calculus

    A water trough is 10 m long and a cross section has the shape of an isosceles trapezoid that is 30 cm wide at the bottom, 80 cm wide at the top, and has height 50 cm. If trough is being filled with water at the rate of 0.2 m^3/min how fast is the water

    asked on September 5, 2016
  6. math and music

    How would you go about listing all of the integer ratios? I would like to have the integers listed in ascending order by the product of each integer's numerator and the denominator. This is because in music, more "complex" ratios sound more dissonant.

    asked on November 19, 2010
  7. Algebra

    Depreciation: The purchase value of an office computer is $12500. Its annual depreciation is &1875. Find the value of computer after 6 years. Aritmetic Sequence

    asked on March 6, 2016
  8. Differential Calculus

    A norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window 10 m, express the area A of the window as the function of width x of the window.

    asked on June 28, 2016
  9. chemistry

    Ethanol glycol has a density of 1.11 g/cm^3. What is the volume in L of 4.1 kg of this liquid?

    asked on August 31, 2014
  10. chemistry

    How do you convert 3.345 kJ to mJ?

    asked on August 31, 2014
  11. CSAB/Advance Algebra

    A handful of 65 coins consist of pennies, nickels and dimes. The number of nickels is 4 less than twice of pennies, and there are 13 more dimes than nickels. How many coins of each kind are there? Solve using Gauss-Jordan Elimination.

    asked on January 19, 2016
  12. Chemistry 1 HN

    Find the mass of iron heated to 85 degrees celcius that was added to 54.0 grams of water. The temperature of the water changed from 20 degrees celcius to 60 degrees celcius. The specific heat of the iron is 0.045 J/g degrees celcius

    asked on January 1, 2013
  13. recreational math, music

    How would you go about listing all of the integer ratios, preferably in a spreadsheet? I would like to have them listed in ascending order by the product of the numerator and the denominator, because in music, more "complex" ratios produce more dissonance.

    asked on November 16, 2010
  14. Chemistry

    "How many moles of oxygen are required to react completely with 5 mol C(8)H(18)?" 2C(8)H(18) + 25O(2) => 16CO(2) + 18 H(2)O In the question, how do I know if "oxygen" means the molecule O(2) or the element O?

    asked on September 21, 2010
  15. Spanish

    ¿Cómo se dice "I am going to bed." en español? ¿Puede se dice "Me acuesto"?

    asked on October 20, 2010
  16. Jiskha

    Why were some of my answers deleted? I'm not mad, I just want to know how this site works.

    asked on September 22, 2010
  17. physics please help!

    Find the velocity (in m/s) of a free-falling object released from rest after it has fallen 100m. I don't understand the formulas to use or anything. please help.

    asked on September 16, 2008
  18. Physics lab

    During a lab, we dropped a ball from the second story of our school and found out the distance, ave. time, ave. velocity, final velocity and the acceleration. One of the questions is: If we could redo this experiment from a 300 ft radio tower instead of

    asked on September 22, 2008
  19. physics please help!

    A car driving along a straight road increases its velocity from 2.8 m/s to 9.7 m/s in 3 seconds. Calculate its acceleration in m/s^2 A skier in the Giant Slalom will accelerate at a constant 5.0 m/s^2 If she starts from rest, how fast is she going after 5

    asked on September 10, 2008
  20. Physics

    An ant is observed to travel 12.6 meters in 4.6 minutes. Find the average velocity of the ant in m/s and the instantaneous velocity of the ant at the 8 meter point. So i found the average to be 2.7 m/s. Is that right? and how do you find the instantaneous

    asked on August 31, 2008
  21. math

    Solve the system. {x^2 + y^2 = 85 {3x + y = 15

    asked on June 10, 2018
  22. chemistry

    How would you convert 77 degrees F to kelvins? Can you explain it please because I don't really understand how to get it to Fahrenheit.

    asked on August 30, 2014
  23. health care

    identify a contemporary health care issue and write a paper that describe the impacts from a business organization

    asked on June 18, 2011
  24. Chemistry

    I am looking for a systematic way to balance chemical equations, instead of doing them by hand. Can someone help me understand the table in the How Does It Work? section at tinyurl dot com/28mngtt

    asked on September 27, 2010
  25. Chemistry

    Why do H and F form a covalent bond, while Na and Cl form an ionic bond?

    asked on September 23, 2010
  26. Solid Mensuration

    A metal hollow bar whose cross-section and dimensions are shown below weighs 8x10^3 kg/m^3 and measures 2m in lenght. Determine the mass of the metal bar with a square hole section.

    asked on March 31, 2016
  27. math

    Simplify (3x-2)^3 - (4x+5)^2

    asked on August 27, 2014
  28. Math

    2^x = (3/2)^6 solve for x

    asked on November 29, 2010
  29. Math

    The weighted mean of the numbers 204, 206, 207, and 208 is 207.2. How could I arrive at the weight (or possible weights) of the four numbers?

    asked on September 23, 2010
  30. Jiska

    So are most of the question-answerers on this site volunteers, or are they paid by the advertising?

    asked on September 22, 2010
  31. math

    how do i go about solving the follwoing problem: using the digits 1 to 9, arrange the numbers in three groups so that the sum is the same in each group. Is there more than one way to do this?

    asked on October 23, 2007
  1. waste water treatment

    Wastewater from a small town is treated in a trickling filter which is preceded by a screen, sand-removal and primary clarification. The maximum hydraulic capacity, or peak flow, of the treatment plant is 1,500 m³/h. The dry weather flow (Qdwf) amounts

    posted on December 29, 2018
  2. math

    The lesson is Lesson 5 Polygons and Angles for Unit 1. This thread confused me so I'm going to give the right answers... 1.) B 2.) C 3.) A 4.) B 5.) A 6.) C 7.) D 8.) C 9.) B 10.) D 11.) C 2/3/2017

    posted on February 3, 2017
  3. Math

    2X/2=288/21 X=44 ,Linear equation. :)

    posted on January 20, 2016
  4. statistics

    n a local university,40% of the students live in the dormitories. A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?

    posted on March 20, 2011
  5. math and music

    Thanks. I already know all of what you said, except for that last sentence (Wouldn't that only apply in certain keys? C seems much easier for 3rds, 4ths, and 5ths than C#). I just want to know how to generate that list in a spreadsheet.

    posted on December 7, 2010
  6. maths

    (8)*8-64/(8)+4 parentheses 8*8-64/8+4 no exponents 64-8+4 multiplication & division 60 addition & subtraction pemdas = p, e, m&d, a&s

    posted on December 4, 2010
  7. Algebra 1

    The formula for slope is change in y/change in x. F(x) is the same as y in this case. Change in y = 2--2 = 4. Change in x = -3-5 = -8. 4/-8 = -1/2

    posted on November 26, 2010
  8. Composition and Communication

    Adverbs are words that modify adjectives, verbs, or other adverbs. Many end in -ly. Check out the Wikipedia article for examples.

    posted on November 26, 2010
  9. Math

    ((4x^3)(y^-2))/((2x^-1)(y^4) The way you typed your equation leaves some ambiguity; I'm assuming this is it. First move the variables with negative exponents to opposite sides of the fraction bar, and make those exponents positive. Then add the exponents

    posted on November 20, 2010
  10. Chemistry

    Oh, sorry, I thought I got to your question earlier than I did. I guess this site doesn't work too well for real time discussions...

    posted on November 19, 2010
  11. collegeMath

    This looks more like late middle school math to me. Anyway, the equation is f(4) = 8(4^2) = 8(16) = 128. Notice I replaced x with 4 to set up the equation, so that it reads "f of 4 (the force needed to stretch 4 centimeters) equals 8 times 4 to the power

    posted on November 19, 2010
  12. 6th grade SCIENCE

    bioweb .wku .edu/courses/biol225/225lab9 .html gsu .edu/~bioasx/closeopen .html According to the first article, they don't have circulatory systems at all, and I assume that's because they do not have a heart. Remove the spaces to access the webpages.

    posted on November 19, 2010
  13. Chemistry

    Find the molar mass of N2H2. Now find the number of moles that are in 5.0 x 10^14g of N2H2. With me so far?

    posted on November 19, 2010
  14. geometry

    It helps a lot to draw a picture. Although the problem does not specify how the points are arranged, I assume they are in a line. Your picture should be a line with points a, b, and c on the line. Now write 3x above the ab segment and 5x above the bc

    posted on November 19, 2010
  15. math

    the carat symbol ^ means "to the power of"

    posted on November 19, 2010
  16. math

    Before you start multiplying, you need to make sure everything is in the same units. For length, you can use either cm or m. I'll pick meters. That means we have to convert 100cm to m. There are 100 cm in a m, so 100cm = 1m. Meters x meters = square meters

    posted on November 16, 2010
  17. history

    take the space out of the URL

    posted on November 16, 2010
  18. history

    I wasn't able to find a "reeducation movement", but searching the web and library for the history of Native American education should provide some good sites. Here is a short overview: nrcprograms . org/site/PageServer?pagename=aief_hist_main

    posted on November 16, 2010
  19. math

    a+(a+1)+(a+2)=(a+2)x2 combine like terms 3a+3=2a+4 subtract 2a from both sides a+3=4 subtract 3 from both sides a=1 the integers are 1,2,3

    posted on November 16, 2010
  20. math 12

    It helps to start with a simpler problem. Try solving it manually, by drawing out each possible seating arrangement, with three members instead of six. The problem specifies a circular table, so we can probably assume that there is a difference between

    posted on November 16, 2010
  21. math

    this site should explain everything (remove spaces) purplemath . com/modules/orderops . htm

    posted on November 8, 2010
  22. Chemistry

    Hydrogen peroxide is H2O2. First, convert the given amount (1kg O2) into moles. One mole of O2 is 2x16g = 32g. 1kg = 1000g. 1000/32 = 31.25, so we need 31.25 moles of O2. One mole of H2O2 contains one mole of O2, so we need 31.25 moles of H2O2 to produce

    posted on November 8, 2010
  23. Alg & Trig 2

    Find the least common denominator by multiplying the prime factors, 7 and 2, and x to get 14x. Multiply each fraction by 7x, 2, and 14 respectively so that they share the denominator 14x. Add the numerators to get (7x+74)/14x. Simplify 7x/14x to 1/2 and

    posted on November 5, 2010
  24. Algebra

    The decaf coffee contains 3 units of caffeine per cup (100 minus 97). The regular coffee contains 100 units of caffeine per cup. Two cups of regular coffee contains 200 units, so you would have to drink 200/3 = 66.666 cups of decaf. 66.666*8 = 533.333

    posted on November 2, 2010
  25. spanish

    B looks good to me -- wordreference dot com is excellent for looking up conjugations, especially if you install the Firefox shortcuts

    posted on October 28, 2010
  26. Chemistry

    convert .25 L into mL by multiplying by 1000, then divide the volume of ethanol by the volume of water

    posted on October 28, 2010
  27. Biology

    The Wikipedia article "Cell cycle" has an excellent diagram in the Phases section.

    posted on October 28, 2010
  28. Pre-Calculus Algebra

    The book could be wrong. The wording is a little confusing too.

    posted on October 26, 2010
  29. Pre-Calculus Algebra

    It helps to draw a picture. You can ignore the length of the fence, add 2 to 8 to get the length of the one leg of the triangle (the other is 13), and use the formula a^2 + b^2 = c^2

    posted on October 24, 2010
  30. math

    this looks like a good explanation studyzone . org/mtestprep/math8/a/primefactors7l . cfm

    posted on October 24, 2010
  31. Mathematics for Liberal Arts


    posted on October 24, 2010
  32. Spanish

    Got it, thanks! By the way, when you're talking/writing, how do you decide where to put the "se" since it doesn't matter where it goes?

    posted on October 24, 2010
  33. elementary-math

    That sounds pretty advanced for an elementary class. One way you could start to solve this is to use a few different values for n and see what you get. Using n=1,2,3 we get p=7,13,19. Do that for a bunch of numbers (a spreadsheet program like Excel or

    posted on October 20, 2010
  34. math

    2/3 * 12 = 24/3 = 8

    posted on October 20, 2010
  35. engish language art

    Could you rephrase the question?

    posted on October 20, 2010
  36. vocab

    I've always hated problems like that. You can use this site, just set the maximum number of words to one. wordsmith dot org/anagram/advanced dot html

    posted on September 23, 2010
  37. Chemistry

    Thanks. I read ahead a few pages and found what I wanted to know.

    posted on September 23, 2010
  38. honors math 7th grade

    Are you supposed to fill in the diagram? It's just a matter of organizing and using every bit of information the problem gives you. Try to work backwards from this answer to learn how to do it. none-22, tng-73, ds9-17, voy-11, tng/voy-31, tng/ds9-23,

    posted on September 23, 2010
  39. Jiskha


    posted on September 22, 2010
  40. Jiskha

    How does one become a tutor?

    posted on September 22, 2010
  41. Jiskha

    Who is "we"?

    posted on September 22, 2010
  42. Jiska

    I wonder who benefits from the adverts, then...

    posted on September 22, 2010
  43. Math

    2:3, "two to three", and 2/3 all mean the same thing

    posted on September 22, 2010
  44. Math

    Divide 20/35 and 24/36, and pick the answer equal to 2/3.

    posted on September 22, 2010
  45. Chemistry

    But if the question wanted me to find the moles of O, how would it be phrased? Thanks

    posted on September 21, 2010
  46. Calc

    Y-intercept represents the maximum number of spaces he can rent, renting each space for $0. X-intercept represents the maximum amount he can charge per space, renting 0 spaces. Also a minor correction to slope: The more he charges, the fewer spaces he will

    posted on September 21, 2010