1. Chemistry

    A student reacts 20.0 grams of sodium hydroxide with hydrochloric acid and obtains 25.0 grams of sodium chloride. What is the percent yield?

    asked by Lisa on April 3, 2011
  2. Jiskha

    The other day I was on this site and my sister saw me. She told me to never go on this site, and she was accused of cheating off of it before. I told her that cheating is prohibited on Jiskha(and that Jiskha doesn't give answers, it just helps), but she

    asked by Anonymous on March 1, 2018
  3. Algebra 1 (Reiny)

    The measures of the sides of a triangle are shown as polynomials. The measures are: 2s^3 + 4; 5s; 4s^2 + 1. Write a polynomial to represent the perimeter of the triangle.

    asked by Anonymous on February 20, 2014
  4. Math

    room size i s 10ft x 15ft. i want to put tile down and the tile size is 3 inches in all sides. How many tiles do I need?

    asked by Corrin on February 9, 2012
  5. Geometry

    The sides of a triangle have lengths of 9, 11, and 16 units. What is the perimeter of a similar triangle with its longest side 24 units in length?

    asked by Danielle on January 8, 2015
  6. math

    An equilateral triangle has a perimeter of 33 inches. What would the perimeter of a square whose sides each measure the same length as the side of the triangle?

    asked by chanelle on December 5, 2011
  7. maths

    the sides of a triangle are in the ratio 2 ratio 3ratio 4. if the shortest side measures 6cm,what is the perimeter of the triangle?

    asked by Krtin on September 24, 2010
  8. Algebra 2

    Solve the equation : 8^2x-1 = 16^x+1 i know you have to log both sides log8^2x-1 = log16^x+1 and then you use the exponential rule 2x-1 log8 = x+1 log16 but then i don't know what to do...

    asked by Brooke on February 22, 2015
  9. Math

    Find the area of the parallelogram that has the vectors as adjacent sides. u = i+2j+2k v = i+k I know that I have to use (-2,-2,2) sqrt (1-2)^2 + (2+2)^2 + (2-2)^2 = sqrt17 Area = sqrt 17. Is this correct?

    asked by Abbey(Please check) on May 4, 2010
  10. Geometry

    The lengths of the three sides of an isosceles triangle are 24", 24", and 14". Find the measure of each length of each angle. Then find the area of the triangle.

    asked by George on October 23, 2016
  11. Math

    A triangle has sides 3x + 7, 4x – 9, and 5x + 6. Find the equation that represents its perimeter I believe you put each equation which represents a side in parenthesis: (3x + 7) + (4x – 9) + (5x + 6)

    asked by Aimee on February 22, 2007
  12. maths

    each interior angle of a regular polygon is 18 degree more than eight times an exterior angle. the number os sides of polygon is.

    asked by polygon on March 28, 2012
  13. St Eugene university

    Solve x^2 times second derivative -3x times first derivative -5y =sin(logx) my solution is integrating both sides we have sinxlogx

    asked by Daniel on October 17, 2015
  14. Math PLEASE HELP

    solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

    asked by Harold on September 25, 2011
  15. Math

    Graph the equation. Be sure to simplify equation before graphing it. -18+2y=-7y I got the answer y=2 because I subtracted 2 from both sides got -9 then divided by -18 and got 2. y=2. So now can someone help me with graphing the points?

    asked by Christopher on April 22, 2014
  16. math

    the ratio of the lengths of the corresponding sides of two rectangles is 8:3. The area of the larger rectangle is 320 ft^2. What is the area of the smaller rectangle?

    asked by Davon on June 10, 2012
  17. History

    Hi, I am doing a civics project and right now I have to find an article about firearms that isn't biased and represents two sides. Can someone help find an article?

    asked by Katherine on May 3, 2018
  18. math

    what is the volume of a right rectangular prism has a square base with sides that are 4 meters in length. the height of the prism is 10 meters?

    asked by Anonymous on July 3, 2013
  19. math

    Right triangle DEF has sides that measure x, x, and x squared for the some value of x. What is the area of triangle DEF to the nearest 0.1 square unit?

    asked by Melissa on April 20, 2014
  20. Math PLEASE HELP

    solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

    asked by Harold on September 25, 2011
  21. Math PLEASE HELP

    solving for X: 3000=8800(1+(0.025)x) I divided both sides by 8800 got 15/44= 1+0.025x subtracted each side by 1 then got -29/44=0.025x = -26.36.. Is that right?

    asked by Harold on September 25, 2011
  22. Geometry

    A regular hexagon with sides of 3" is inscribed in a circle. What is the area of a segment formed by a side of the hexagon and the circle?

    asked by Buggy on May 19, 2010
  23. math

    a figure on the left is the base of a right solid whose sides are 10 centimeters tall. what is the volume of the solid in cubic centimeters?

    asked by Hayley on March 9, 2011
  24. math

    The size of an interior angle of a regular polygon is 3x° while its exterior angle is (x- 20)°. Find the number of sides of the polygon

    asked by kudu on February 17, 2015
  25. math

    The volume of a cube is increasing at a rate of 2 1/2cm cube/sec. Find the rate of change of sides .

    asked by Princeton on April 21, 2016
  26. math

    a 4 -inc picture cube has pictures only on the front,back,and sides.what is the surface area of the cube that is covered by pictures?

    asked by lakshmi on April 6, 2016
  27. Algebra

    Please Solve: 4-x=-5 I thought the answer was -9 but that doesn't seem to be it. Can someone please help? Thanks! This is what I have: 6. 4-x=-5 The problem to solve is: 4-x=-5 Subtract 4 from both sides x = -9 Then divie by -1 Would the answer be 9? To

    asked by Angie on June 27, 2009
  28. Math

    The angles opposite the congruent sides of an isosceles triangle are congruent. Find the value of x in the triangle. Show all your work.

    asked by bubblegum on February 6, 2019
  29. Math

    When you add the same number to both sides of an inequality, is the inequality still true? Explain how you know that your conjecture holds for subtracting the same number.

    asked by Anonymous on October 2, 2017
  30. Geometry

    The base of the prism is a rectangle with sides 13 m and 5 m in length. Find the lateral surface and surface area of the given prism.

    asked by JC on May 5, 2012
  31. math

    Lily designed a deck in her backyard that is in the shape of a quadrilateral that has only 1 pair of parallel sides. What is the shape of the deck?

    asked by Anonymous on June 17, 2014
  32. GEOMETRY

    the trapezoid has equal nonparallel sides the upper base is 6. the lower base is 16. and the diagonal is 12. what is the attitude of the trapezoid?

    asked by Anonymous on April 3, 2010
  33. Math

    Jamie has a pentagon that she thinks has two pairs of congruent angles and two pairs of congruent sides. How can she check this without using any tools?

    asked by Mia on March 19, 2012
  34. math

    If the sides of a box all double in length, by how much does its volume increase? By a factor of 2 By a factor of 4 By a factor of 6 By a factor of 8 Explain your answer.

    asked by M.A. on June 24, 2010
  35. math/ACT/algebra

    If one side of a triangle is 10 inches long, which of the following could NOT be the lengths, in inches, of the other sides? A. 2 & 9 B. 3 & 5 C. 5& 10 D. 10 & 10 E. 10 & 12 I think it might be B but I don't know and I don't know how to figure the answer..

    asked by Katie on October 26, 2007
  36. Math

    Jamie has a pentagon that she thinks has two pairs of congruent angles and two pairs of congruent sides. How can she check this without using any tools?

    asked by Mia on March 19, 2012
  37. math

    PQ and RS are 2 parallel chords of a circle such that PQ = 8 cm & RS = 6 cm. If the chords are on the opposite sides of the centre and distance between them is 4 cm. find the radius of the circle

    asked by cirlcles on September 5, 2016
  38. math/ACT/algebra

    If one side of a triangle is 10 inches long, which of the following could NOT be the lengths, in inches, of the other sides? A. 2 & 9 B. 3 & 5 C. 5& 10 D. 10 & 10 E. 10 & 12 I think it might be B but I don't know and I don't know how to figure the answer..

    asked by Katie on October 26, 2007
  39. Math

    Quadrilateral PQRS has vertices P(0,6), Q(-6,-2), R(2,-4), and S(4,2). Verify that the quadrilateral formed by joining the midpoints of the sides of PQRS is a parallelogram.

    asked by Vanessa on October 19, 2012
  40. math

    Please Help! The perimeter (distance around) of a triangle is 7/x+1, The sum of two sides of the triangle is 3/x, the distance of the remaining side follows he format ax+b/x^2+x. what is the vale of a?

    asked by sam on October 2, 2013
  41. Calculus

    For 0 < x < PI/2, if y = sin(x)^x, then dy/dx is.. I understand that you can take the natural logarithm of both sides and then take the derivative but why can't I simply take the derivative of it and get.. dy/dx = x(cos(x))(sin(x))^(x-1). Thanks in advance

    asked by Anonymous on March 30, 2008
  42. Math

    The hexagon below is made up of six equilateral triangles with sides of 6 centimeters each. The height of each triangle is 5.2 centimeters. What is the area of the hexagon

    asked by Lee on May 11, 2013
  43. Math help ASAP!!

    Which of the following could be the lengths of the sides of a triangle? A. 1, 3, and 4 units B. 2, 3, and 6 units C. 4, 4.5, and 5 units D. 3.5, 4.5, and 8 units This is on my STAAR packet for extra credit so please help ASAP!!!!!

    asked by GlitterEyes✨ on April 3, 2018
  44. math

    The lengths of the sides of a triangle are 13, 14 and 15 units. Find the shortest side of a similar triangle whose longest side is 21.

    asked by Ana on July 9, 2015
  45. math

    A triangle whose sides are 5,12, and 13 inches is similar to a traingle whose longest side is 39 inches. What is the perimeter of the larger triangle?

    asked by erika on February 23, 2011
  46. Math

    A triangle with two congruent sides and two angles that both mesuare 45 is a. scalence and right b. isosceles and acute c. isosceles and right d.equilateral and acute

    asked by Leah on December 5, 2010
  47. MATH

    A triangle with two congruent sides and two angles that both measure 45 is a.scalene and right b.isosceles and acute c.isosceles and right d. Equilateral and acute

    asked by Please Help! on December 5, 2010
  48. geometry

    WHAT IS THE BASE LENGTH OF AN ISOSCELES TRIANGLE IF YOU KNOW THE EQUAL SIDES HAVE A VALUE OF 5 AND THE ANGLE BETWEEN THEM IS 45 DEGREES AND THE BASE ANGLES ARE 67.5 DEGREES?

    asked by Anonymous on November 3, 2010
  49. math

    A trapezoid has an area of 10.5cm^2 and parallel sides that meausure 5.0cm and 2.0cm. What is the height of the trapezoid? Explain what you did.

    asked by Anonymous on February 19, 2013
  50. math

    How many different triangles can you make with a perimeter of 12 units And also use integer values for the length of the sides to investigate how to make up your triangles

    asked by JBeeee on March 8, 2015
  51. calculus

    A regular decagon(12 sides) in inscribed in a circle with the radius r. The decagon has an area of108 in^2. What is the radius of the cirlce?

    asked by Kristina on May 19, 2011
  52. math

    Assume a cube with all sides equal to x. Let the change in x with respect to t; x(t) = 2t + 1. What is the formula for the rate of change of the volume of the cube?

    asked by Jamie on June 6, 2014
  53. calculus

    A regular decagon(12 sides) in inscribed in a circle with the radius r. The decagon has an area of108 in^2. What is the radius of the cirlce?

    asked by Kristina on May 19, 2011
  54. Geometry

    Which three lengths cannot be the lengths of the sides of a triangle? A)25 m, 16 m, 10 m B)15 m, 13 m, 12 m C)18 m, 5 m, 10 m D)8 m, 8 m, 15 m

    asked by Jessie on December 6, 2012
  55. math

    The sides a,b,c of a triangle are such that a^2+b^2+c^2=ab+bc+ca.What type of triangle is it?

    asked by Nitumoni on September 27, 2014
  56. math

    an octagon has 8 sides. how many diagonal does an octagon have

    asked by sophie on August 28, 2008
  57. math

    25/11 + 2y = 3 Subtract 25/11 from both sides How do subtract this fraction from 3?

    asked by rj on April 6, 2013
  58. math

    Is this a star polygon, a polygon, or other, how many sides does it have? {9/3}

    asked by Zach on September 20, 2010
  59. English

    Can someone please proofread this or give me suggestions on how to improve it? Flannery O'Connor's short stories often have similarities. Two of O'Connor's short stories, "The Lame Shall Enter First" and "A Good Man is Hard to Find" share similarities and

    asked by Emily on March 3, 2008
  60. English expression

    (A student is introducing herself and her sister.) Hi. I am Yujin. I am from Korea. I go to middle school. I have a sister. She is very pretty. Her name is Yuri. Bye. ---------------------- Is it OK to use 'Bye' after the introduction? Do we have to use

    asked by John on April 3, 2008
  61. maths

    A student says that the perimeter of a rectangle with length 2x-1inches and width 3x inches can be written as 10x-1inches because 2(2x-1)+2(3x)= 10x-1. Explain why the statement is incorrect

    asked by Gabby on October 2, 2014
  62. algebra

    A student rolled two six-sided number cubes several times. The numbers below are the sums of the numbers she rolled. Which histogram represents the data?2, 7, 10, 6, 12, 9, 5, 10, 6 I'm stuck

    asked by Anonymous on May 23, 2016
  63. Chem

    A student reacts 57g of salicylic acid with 21 mL of acetic anhydride producing 10.5g of acetyl salicylic acid. What is the percent yield of the reaction?

    asked by Kennedy on March 20, 2016
  64. Physics

    a 59kg student jumped off the back of a 42kg sailboat, the boat was already travelling at 3.1m/s before she jumped. if she jumpped off with a speed of 2 m/s, how fast was the boat moving? thanks for any help

    asked by Josh on December 1, 2011
  65. Science

    A student goes to college,driving his car at 20 km per hour. He returns though same route ,driving at 40 km per hour . Find average speed during entire journey

    asked by Riya on May 7, 2016
  66. early childhood literacy

    when a teacher hears a preschool student using incorrect language she should 1. model the correct language 2. correct his mistakes 3. ask him to repeat correctly 4. ask him to think about each word as he says it.

    asked by reema on June 5, 2012
  67. Problem Solving: Make a Table

    Ed saved $50 one week. For the next six weeks, he saved $25 more than the week before. how much did he save in all? one student sloved this problem using the expression $50 + 6($25)=200 What error was made? What is the right anwser?

    asked by Lorena P. on January 25, 2012
  68. physics

    A 90-kilogram physics student would weigh 2970 Newtons on the surface of planet X. What is the magnitude of the acceleration due to gravity on the surface of planet X?

    asked by tyler on December 4, 2014
  69. math

    The student to teacher ratio is 19:1 at a local school and there is a total of 500 students and teachers. How many teachers and how many students are there. I'm not sure how to begin to set this up since I have two unknowns and not only one.

    asked by Julie on April 11, 2016
  70. Chemistry

    A student mixes 675 mL of water and 256 mL of 3.30 x 10-5 M orangefood dye solution. What is the concentration of this new dilute solution of orange food dye?

    asked by Anonymous on May 16, 2016
  71. Chemistry

    A student estimated a mass to be 250 g but, upon carefully measuring it, found the value to be 240 g. What is the percent error of the estimated mass if the measured value is the accepted one? A. 4.2% B. 4.0% C. -4.2% D. -4.0% D?

    asked by quick help needed on June 5, 2016
  72. math

    An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 82, 64, and 98 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.

    asked by seanna on September 7, 2008
  73. Health (Ms. Sue)

    Describe an effective refusal method you could use if someone were to tell you, "Here, try these new cigarettes, almost everyone in our school smokes these." A: I would use refusal skills and simply respond by saying, "No, thank you. I would rather be

    asked by Anonymous on November 18, 2013
  74. math

    There are 11 kids in a class and the teacher gave out jelly beans and the minimum # is 9, maximum # is 18, mode is 12, median is 13. How do I find out how many jelly beans each student got?

    asked by Susan on October 21, 2009
  75. Physics

    A student accurately uses the method for combining vectors. The two vectors she combines have magnitudes of 55 and 25 units. The answer that she gets is either 85, 20, or 55. Pick the correct answer, and explain.

    asked by Anonymous on September 27, 2010
  76. economics

    Best Western University is trying to increase the size of its student body by shifting the demand curve for its educational services to the right. Which of the following will NOT shift its demand curve to the right?

    asked by deanna on October 22, 2010
  77. 4th grade math

    Students are standing in a circle evenly spaced and numbered in order. The 3rd student is directtly opposite the 7th. How many students are in the circle?

    asked by Rusty on February 22, 2011
  78. finance

    For a $13,000 student loan with a 6% APR, how much of the payment will go toward the principal and how much will go toward paying interest for each of the first six payments? Assume this is a 10-year loan with monthly payments.

    asked by lynn on March 12, 2014
  79. physics

    The student undergoes a second displacement of 5.0 meters at an angle of 45 degrees SOUTH of EAST. The x component, (EAST WEST) of the total displacement is_

    asked by mohamed mokhbat on December 16, 2010
  80. Chemistry

    A student mixes 450 mL of water and 116 mL of 7.90 x 10-5 M greenfood dye solution. What is the concentration of this new dilute solution of green food dye?

    asked by Tif on April 29, 2013
  81. Chm General 2

    if a student doing an experiment failed to dry the KHP before using it to standarize the NaOH solution. A) Would her calculated molarity of the NaOH solution probably be too hight or too Low?

    asked by Karla on March 23, 2011
  82. physics

    The student undergoes a second displacement of 5.0 meters at an angle of 45 degrees SOUTH of EAST. The x component, (EAST WEST) of the total displacement is_

    asked by Anonymous on December 16, 2010
  83. physics

    A student sets up an Atwood machine with a frictionless rope, a 4.5-kg mass, and a 9.5-kg mass. What will be the acceleration of the masses? Use the gravitational acceleration found on Earth: g = 9.8 m/s2.

    asked by sofia on September 27, 2013
  84. Math

    Financial aid students must pass 2/3 of their courses each term in order to continue their aid. If a student is taking 18 hours, how many hours must be passed?

    asked by Rebecca on July 20, 2014
  85. chemistry

    A student conducts this experiment and finds the boiling point of the unknown to be 80 ± 3 °C. Use the table in the Physical Properties experiment to select all of the following compounds which might be the unknown

    asked by karli on February 1, 2011
  86. math

    Certain financial aid students must pas 2/3 of the courses each term in order to continue their aid. if a student is taking 18 hours, how many hours must be passed?

    asked by kgk on June 21, 2014
  87. math

    A classroom bulletin board is 7ft by 4ft,if there is a picure of a student every 6 inches along the edge including 1 in each corner,how many pictures are on the bulletin board?

    asked by Tamika on October 16, 2013
  88. chemistry

    A student conducts this experiment and finds the boiling point of the unknown to be 80 ± 3 °C. Use the table in the Physical Properties experiment to select all of the following compounds which might be the unknown

    asked by karli on February 1, 2011
  89. PSY

    In an English class last semester, Foofy earned a 76 1X 5 85, SX 5 10). Her friend, Bubbles, in a different class, earned a 60 1X 5 50, SX 5 4). Should Foofy be bragging about how much better she did? Why?

    asked by Joy on February 2, 2014
  90. English

    Q: What is the English name for the restaurant which carries food made with flour, a kind of flour based food restaurant?

    asked by rfvv on June 9, 2014
  91. Psychology (statistics)

    In an English class last semester, Foofy earned a 76 1X 5 85, SX 5 10). Her friend, Bubbles, in a different class, earned a 60 1X 5 50, SX 5 4). Should Foofy be bragging about how much better she did? Why?

    asked by Joy on February 2, 2014
  92. algebra

    In a survey of a TriDelt chapter with 50 members, 21 were taking mathematics, 33 were taking English, and 6 were taking both. How many were not taking either of these subjects? members

    asked by ng on April 18, 2013
  93. Spanish

    Click on the audio button below to listen to the following Spanish word: el hogar. Which word is the English translation of the Spanish word? A. dining room B. kitchen C. home**** ========= What popular Mexican dish uses stuffed poblano chiles? A.

    asked by Pepsi on November 6, 2017
  94. math

    A committee of 5 is chosen from 6 teachers and 3 students and 7 others. Determine the number of ways of selecting the committee if it is to contain: (a)at least two teachers (b)no teacher nor student

    asked by Tim on May 8, 2017
  95. com/215

    how you would approach creating a negative message for a superior? VERSUS creating a message for a colleague, subordinate or fellow student.

    asked by Issabella Landcaster on January 27, 2009
  96. Math

    The teacher asked Laura to give each student 2/5 sheets of paper. If there are 20 students in the class how much paper did Laura pass out?

    asked by Marcus on December 17, 2012
  97. Math

    A student was asked to divide a number by 12. Instead he divided the number by 24. In doing so he got a quotient which was 16 less than the original number. Which of the following cannot be the value of that number. A) 394 B) 398 C) 396

    asked by Madhura on July 13, 2016
  98. math

    A student claims that to divide a number with the units digit 0 by 10, she just crosses out the 0 to get the answer. She wants to know if this is always true and why and if the 0 has to be the units digit. How do you respond?

    asked by Kali G on September 13, 2014
  99. math exam tommrow review

    the mean score on a math test taken by 15 students was 82%. one more student takes the test late and earns 93%. what is the new mean score? please show work

    asked by ellis on December 18, 2012
  100. A/P Chem

    A student wants to make a 5.00% solution of potassium chloride using .0377 g of the substance.What mass of water will be needed to make the solution?

    asked by Autum on July 24, 2011