Piper

Most popular questions and responses by Piper
  1. Chemistry

    Magnesium has three stable isotopes: 24Mg, 25Mg, 26Mg. The relative abundance of 24Mg is 79%. What are the relative abundances of 25Mg and 26Mg?

    asked on February 3, 2017
  2. Physics

    1. A rabbit and a turtle are practicing for their big race. The rabbit covers a 30.0 m practice course in 5.00 seconds; the turtle covers the same distance in 120 seconds. If the actual race is run on a 96.0 m course, by how many seconds will the rabbit

    asked on June 18, 2014
  3. geometry

    Quadrilateral JKLM is a rhombus. The diagonals intersect at N. If angle KNJ equals 8x + 6, find the value of x

    asked on December 16, 2011
  4. Math

    With time, t, in minutes, the temperature, H, in degrees Celsius, of a bottle of water put in the refrigerator at time t=o is given by H = 4 + 16e-.02t How fast is the water cooling initially? After 10 minutes? Include units in your answer

    asked on April 8, 2010
  5. math

    solve the initial value problems: 1- dq/dz = 2 + sinz, q(0)=5 2-dy/dx = (x^2 -2)x, y(2)=4 3-dy/dx = 4e^5^x + x, y(0)=4 4- dy/dx 3x + 2, y(3)= 2

    asked on April 19, 2010
  6. Algebra

    Word Problems: 1. A farmer has 2400 feet of fencing and wants to fence off a rectangular field that borders a straight river. If he needs no fence along the river, what are the dimensions of the field that he can fence with the largest area? Find the area

    asked on August 13, 2014
  7. Math

    Explain in a variety of ways how you can distinguish the exponential function f(x)=2^x from the quadratic function f(x)=x^2 and linear function f(x)=2x. (Hint: Compare the rate of change using finite differences in table of values; identify a constant

    asked on April 6, 2015
  8. Chemistry

    The Ka of a monoprotic weak acid is 3.29 × 10-3. What is the percent ionization of a 0.176 M solution of this acid?

    asked on September 27, 2012
  9. Chemistry

    The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium, this work function equals 4.34 x 10-19 J. If light with a wavelength of 256 nm impinges on a piece of calcium,

    asked on February 4, 2017
  10. writing skills

    Do your homework before applying for any job. If you rewrote sentence 5 beginning with Be sure that you the next words should be 1 got done your homework 2 got your homework done 3 had done your homework 4 did your homework 5 have done your homework answer

    asked on June 28, 2016
  11. math

    The average cost per item, C, in dollars, of manufacturing a quantity q of cell phones is given by C= (a/q) + b where a and b are positive constants a.Find the rate of change of C as q increases. What are its units? b. Currently, 5000 phones are being made

    asked on April 8, 2010
  12. chemistry

    What is the pH of a solution formed by mixing 400 mL of 0.025 M HCl with 600 mL of 0.015 M NaOH?

    asked on May 2, 2012
  13. math

    1. With time, t, in minutes, the temperature, H, in degrees Celsius, of a bottle of water put in the refrigerator at time t=o is given by H = 4 + 16e-.02t How fast is the water cooling initially? After 10 minutes? Include units in your answer

    asked on April 7, 2010
  14. Math

    a carpenter has several boards of equal length. he cuts 3/5 of each board. After cutting the boards, the carpenter notices that he has enough pieces left over to make up the same length as 4 of the original boards. How many boards did the carpenter start

    asked on February 8, 2016
  15. chem

    How many molecules of (CH3)2NH are needed to react completely with 2.00mg of H2C2O4? Help i don't understand this process!

    asked on June 19, 2012
  16. math

    The average cost per item, C, in dollars, of manufacturing a quantity q of cell phones is given by C= (a/q) + b where a and b are positive constants a.Find the rate of change of C as q increases. What are its units? b. Currently, 5000 phones are being made

    asked on April 7, 2010
  17. Math

    Laura bought 24 pounds of sugar for $10. How many dollars did she pay per pound of sugar? If necessary, round your answers to the nearest hundredth. >> I got the answer 0.41 or 2.4. It says it is wrong.

    asked on November 30, 2016
  18. writing skills

    You think using a dictionary is hard, _____________________________________ imagine ________ how difficult it was to compile the first dictionary of English. Which of the following is the best way to write the underlined portion of this sentence? If you

    asked on June 28, 2016
  19. Physics

    An airplane takes off at 9:00 A.M. and flies at 300. km/h until 1:00 P.M. At 1:00 P.M. its speed is increased to 400. km/h, and it maintains this speed until it lands at 3:30 P.M. What is the airplane’s average speed for the entire flight?

    asked on June 16, 2014
  20. writing skills

    When you are told time after time that there are no jobs. And it is time _____________ for some creative thinking and acting. Which of the following is the best way to write the underlined portion of these sentences? If you think the original is the best

    asked on June 28, 2016
  21. WRITING SKILLS

    When you are in school, almost any subject seems a potential area for a good job. What correction should be made to this sentence? 1 replace your are with one is 2 remove the comma after school 3 change Subject to subject 4 insert a comma after area 5 no

    asked on June 28, 2016
  22. Math

    Transform the graph of f(x)=3^x to sketch g(x)=3^−(x+1) −2. Show table of values and each transformation clearly to get full marks. (15,marks)?

    asked on April 6, 2015
  23. Math

    1. A man has 22 feet by 26 feet rectangular lot that he will use for planting. He wants to build a brick of walkway of uniform width on the border of the lot. If the man wants to have 396 square feet of ground left for planting, how wide should he build

    asked on August 17, 2014
  24. Math

    Victor bought a brand new car for P750,000. If the value of the car depreciates 20%per year, what will it be worth during the fourth year?

    asked on June 18, 2014
  25. Physics

    Carlo drives his car for a picnic by first going 105 km north to pick up his girlfriend and then 120.0 km east to reach the picnic groove. The whole trip takes 135 min. Calculate (a) Carlo’s average speed and (b) average velocity.

    asked on June 17, 2014
  26. Physics

    In 1926, Johnny Weissmuller set the men’s world 400.0-m swimming record in 4.00 min, 57.0 s. In 1966, Martha Randall set the women’s record in 4.00 min, 38.0 s. By how many meters would Martha have been beaten Johnny if they had raced each other?

    asked on June 15, 2014
  27. chemistry

    What is the pH of a solution formed by mixing 400 mL of 0.025 M HCl with 600 mL of 0.015 M NaOH?

    asked on May 10, 2012
  28. Chemistry

    The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium, this work function equals 4.34 x 10-19 J. If light with a wavelength of 256 nm impinges on a piece of calcium,

    asked on February 4, 2017
  29. english

    Choose the sentence that has a subject complement. A. The day ended with many surprises. B. I felt much better. C. The nurse felt my pulse. D. We can't leave without seeing her. I think it's B.

    asked on March 20, 2014
  30. MATH (CALCULUS) PLZ HELP

    A common problem encountered by the oil industry is to determine the most cost-effective route to connect various wells in an oil fertile area. The attached map is a copy of a section of a U.S. Geographical Survey contour map with a wetland area outlined.

    asked on April 1, 2010
  31. chem

    How many molecules of (CH3)2NH are needed to react completely with 2.00mg of H2C2O4? Help i don't understand this process!

    asked on June 18, 2012
  32. calculus

    solve the initial value problems: 1- dq/dz = 2 + sinz, q(0)=5 2-dy/dx = (x^2 -2)x, y(2)=4 3-dy/dx = 4e^5^x + x, y(0)=4 4- dy/dx 3x + 2, y(3)= 2

    asked on April 19, 2010
  33. math

    1-show that 1-x/2 is the tangent line approximation to 1/ sqrt of 1+x near x=0 2-what is the local linearization of e^x^2 near x=1 3-find the tnagent line approximation of 1/x near x=1

    asked on March 31, 2010
  34. Trig - check my answers plz!

    1. (P -15/17, -8/17) is found on the unit circle. Find sinΘ and cosΘ Work: P= (-15/17, -8/17) cosΘ = a value P = (a,b) sinΘ = b value Answer: cosΘ = -15/17 sinΘ = -8/17 2. Should the triangle be solved beginning with Law of Sines or Law of Cosines.

    asked on February 3, 2009
  35. math

    i have 2 problems. 1. Only 40% of the seats in a theater are occupied. The theater 320 seat. How many seats are occupied? 2. In one game, a football quarterback threw 20 passes and completed 12 of them. What percent of the passes were completed? while

    asked on August 17, 2017
  36. Physics

    On the way to class, you walk north and then west such that your resultant displacement is 290 m in a direction 250 west of north. Your average velocity is 2.0 m/s in the same direction as the displacement. Calculate (a) your walking time and (b) your

    asked on June 17, 2014
  37. Physics

    To qualify for the finals in a racing event, a race car must achieve an average speed of 225 km/h on a track with a total length of 1.4 km. If a particular car covers the first half of the track at an average speed of 205 km/h, what minimum average speed

    asked on June 15, 2014
  38. English, Reading

    i need help on a few questions from the book October sky/rocket boys so here they are: -name of the rockets (through chapters 1-8) and why did they name them that ? -what does sonny name his new launching site -who is valentine -why is the football team so

    asked on April 20, 2014
  39. math

    what is the base of a parallelogram with the height 6and 5 eighths feet and area of 26 and a half

    asked on January 27, 2014
  40. chem

    How many molecules of (CH3)2NH are needed to react completely with 2.00mg of H2C2O4? Help i don't understand this process!

    asked on June 18, 2012
  41. Chem

    In a titration process it takes 22.00 mL of nitric acid to neutralize 16.70 mL of 0.200 M calcium hydroxide solution. what is the balanced equation and what is the molarity of the acid. please explain

    asked on June 13, 2012
  42. math

    math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the time

    asked on April 20, 2010
  43. math

    a math professor is thrown off the matthews bridges, height 240ft, by a disgruntled calculus class with an intitial upward velocity of 10ft/s a) assumign the acceleration dude to gravity is -32ft/s^2,find the macimum height of the professor. b) find the

    asked on April 20, 2010
  44. SCIENCE

    could you please help me on some information about this topic please. Ihave a presentation to do on this and i need scientific research or journals as references to add to my powerpoint. An Investigation of the Impacts of Current on Shoaling and schooling

    asked on April 14, 2010
  45. language arts

    I cant find the ourspace website, I need for this evenings home work I have search several search engines...Any suggestions please

    asked on August 31, 2011
  46. Chemistry

    At what speed must a human weighing 150.0 lb be traveling in order to have a wavelength at 650 nm?

    asked on February 5, 2017
  47. Math

    Write an equation in point slope form y-y1=m(x-x1) for a line containing the point (1,2) and has a slope of 3 Can someone explain how to do this problem. I'm having trouble with this.

    asked on November 9, 2015
  48. Physics

    1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. A boy kicked a can horizontally from a 6.5 m high rock with a speed of

    asked on June 18, 2014
  49. Physics

    A motorist drives for 150 km from City A to City B in 2.5 hr. He makes the return trip in 2.0 hr. Find (a) the average speed for each half of the trip, (b) the average velocity for each half of the trip, (c) the average speed of the entire trip, and (d)

    asked on June 16, 2014
  50. Math

    What is 0.0185 as a fraction and a percent

    asked on April 25, 2013
  51. social studies

    why do they call the presidents wife the first lady

    asked on November 18, 2012
  52. chem

    How many molecules of (CH3)2NH are needed to react completely with 2.00mg of H2C2O4? Help i don't understand this process!

    asked on June 18, 2012
  53. science

    i need help with standard deviation and erro bars on graph, if i want to talk about my graph and mention the erro bars and what it means how do i do that?

    asked on April 16, 2010
  1. History

    B? Correct me if im worng

    posted on January 29, 2019
  2. LA

    @Finn Wolfhard I love your username!! I love Stranger Things/IT!

    posted on October 4, 2018
  3. Algebra

    1. C 2. C 3. A 4. B 100% I hope this helped! :)

    posted on May 18, 2018
  4. math

    The answer is 3 feet

    posted on May 8, 2018
  5. math

    you subtract then? 320-40=280?

    posted on August 17, 2017
  6. math

    2. 0.6=60% 1. i think you should divide? 125?

    posted on August 17, 2017
  7. writing skills

    let me proof it again Ms.Sue

    posted on June 28, 2016
  8. writing skills

    thanks Sue :)

    posted on June 28, 2016
  9. writing skills

    oh um begin the sentence with be sure that you ...... then the answers 1-5 should be the next words. before applying for any job.

    posted on June 28, 2016
  10. writing skills

    did your homework ?

    posted on June 28, 2016
  11. writing skills

    okay :(

    posted on June 28, 2016
  12. writing skills

    ooh the real answer is 5

    posted on June 28, 2016
  13. Math

    Can Someone give a more detailed explanation

    posted on November 19, 2015
  14. Math

    I do not know how to do the hint.

    posted on April 6, 2015
  15. math

    If there were x people in all, then men = (3/4)(2/5)x = 3/10 x 3/5 x = 140 + (1 - 3/5 - 3/10)x = 140+x/10 6x = 140+x 5x = 1400 x = 280 check: 3/5 of 280 = 168 3/4 of 280-168 = 84 women = 168-140 = 28 168+84+28 = 280

    posted on March 20, 2015
  16. math

    you will need $4.28

    posted on March 20, 2015
  17. Life orientation

    -Promotes socialism (bringing people together), which helps create a stronger bond between people -Provides a building block for patriotism, which can involve cheering on and advocating ones own nation

    posted on March 20, 2015
  18. math 5th grade

    It took 6.

    posted on March 20, 2015
  19. maths financial

    R4976 per month.

    posted on March 19, 2015
  20. Physics

    Thank you

    posted on June 18, 2014
  21. Algebra

    5 a steady process 6. m is the slope

    posted on March 31, 2010
  22. government

    main purpose for which the delegates are chosen.

    posted on January 22, 2009