# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 126

Could you please show me how to solvethis: x+6/4x^2 + 3/2x^2 = x + 4/2x^2 Please show me the steps-I don't even know where to start and I have 30 of these for homework Thank you

asked by Matthew on November 9, 2010
2. ## PreCal

Can someone tell show me how to do this. Show the product as a sum or difference sin 6x cos 2x

asked by Jay on November 20, 2007
3. ## math

If there are exactly 5 times as many children as adults at a show, which of the following cannot be the number of people at the show?

asked by John on November 4, 2011
4. ## Chemistry

The chemical reaction for the generation of gas in an automobile safety air bag is 2NaN3(s)→ 2Na(s)+3N2(g) What volume of gas is produced if there are 130.0 grams of NaN3 used in the reaction? (The density of nitrogen gas is 0.916 g/L.) Please show your

asked by Kayla on March 31, 2014
5. ## physics

A pulley of radius .10 m and having a rotational inertia of .30 kg-m^2 has a cord wrapped around it and attached to a 6.00 kg mass as shown. The pulley is free to rotate about a fixed axis through its center. The mass is allowed to fall from rest. What is

asked by Anonymous on April 13, 2013
6. ## Math 30

A popular game show begins with the host reading a question to the contestants. One question involves putting 4 events (A, B, C, and D) in chronological order. What is the probability that the contestant gets the question correct is he or she just guesses?

asked by Sandy on March 25, 2010
7. ## Math

A local kindergarten is thinking of making posters that show all the different ways of adding two or more integers from 1 to 9 to get a sum of 10. If there is enough space on each poster for up to 50 possible solutions, how many posters will the school

asked by Anonymous on September 12, 2018
8. ## chemistry

A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration setup, but after 25 mL of NaOH was added, what was the pH of solution if initially flask contains 25 mL of 0.250 M HCl

asked by Cindy on October 17, 2010
9. ## Chemistry

A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated? Will a

asked by Vanessa on May 8, 2012
10. ## Chemistry

A buffer solution is prepared by dissolving 0.400 mol of CH3COOH and 0.200 mol of CH3COONa in 1.00 L of water. 1.00 mL of 10.0 M HCl is added to a 100 mL portion of this solution. What is the final pH of the resulting solution? Ka of CH3COOH = 1.8 x 10¯5

asked by Sandy on June 26, 2011
11. ## chemistry

A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated? Will a

asked by Anonymous on April 24, 2012
12. ## chemistry

A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated? Will a

asked by Anonymous on May 8, 2012
13. ## Chemistry

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare

asked by Danielle on September 27, 2014
14. ## General Chemistry

A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What volume of solvent has evaporated from the 0.275 M solution? a)42.2 mL b)63.3 mL c)187.8 mL d)230 mL e)272.2 mL

asked by Kim on June 20, 2012
15. ## chemistry

A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated? Will a

asked by Anonymous on April 23, 2012
16. ## Chemistry

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)? A) 0.40 M B) 0.10 M C) 0.20 M D) 0.25 M E) 0.36 M The answer is supposedly C, but I got A.

asked by Charlie on December 8, 2009
17. ## CHEMISTRY

A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration setup, but after 25 mL of NaOH was added, what was the pH of solution if initially flask contains 25 mL of 0.250 M HCl

asked by Maria on October 17, 2010
18. ## College Chemistry

48.70 mL of an HCl stock solution was transferred into a 500 mL volumetric flask and filled to the mark. 47.67 mL of the diluted solution was titrated with 0.179 M NaOH and found to have the concentration of 0.885 M. What is the concentration of the stock

asked by Mark on December 11, 2010
19. ## Chemistry

A buffer solution is prepared by dissolving 0.400 mol of CH3COOH and 0.200 mol of CH3COONa in 1.00 L of water. 1.00 mL of 10.0 M HCl is added to a 100 mL portion of this solution. What is the final pH of the resulting solution? Ka of CH3COOH = 1.8 x 10¯5

asked by Kendra on June 26, 2011
20. ## Math

Two children sit on a seesaw that is 14 ft long. One child weighs 95 lb, and the other child weighs 69 lb. If x is the distance of the 69-pound child from the fulcrum when the seesaw balances, state the value of each of the other variables in the

asked by Shonvier on March 6, 2012
21. ## Programming

I need your help to write a program using visual basic 2010 for the following:- write a program that calculates the average of up to 50 numbers input by the user and stored in an arrey. The program should use a class named Statistics and have an AddNumber

asked by Solomon on May 13, 2011
22. ## Powers!

1. Should be 8a15 but I think that is just a typo because the * and 8 are on the same key of the keyboard. 2-4 look ok to me. 5. What you have looks ok to me; however, can't these two terms be multiplied to give 200x8y9 ? Yeah sorry about #1 that's what I

asked by DrBob222 on December 4, 2006
23. ## Simple Chemistry

A.Write a brief procedure outling how would you prepare 250mL of a 0.150M solution of a CoCl2 from solid CoCl2 and distilled water b. Using the solution from part a and distilled water, how would you prepare 100ml of a 0.0600 M solution of CoCl2 C. What

asked by Armando on April 28, 2014
24. ## physics

A 1-kg block is lifted vertically 1m by a boy. The work done by the boy would be one jule or would no work be done. I'm confused, I thought lifting wasn't considered work. The work done is actually about 9.81 joules. Think of gravity pulling on the block

asked by susane on November 6, 2006
25. ## Physics

A trap door, of length and width 1.65 m, is held open at an angle of 65.0 degrees with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly

asked by Julia on April 27, 2011
26. ## chemistry

Hi, I was hoping someone could double check a chemistry answer for me. I am trying to calculate the Ksp of Ag2CrO4. This question is based on a experiment to determine ksp experimentally. In the experiment the Ksp of silver chromate was calculated using a

asked by Laura on May 26, 2013
27. ## MATH

Could someone please show me how to solve this Prove tan(-theta) = -tan(theta)

28. ## Chemistry

A. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 13.0 g of luminol into a total volume of 75.0 mL of H2O. -What is the molarity of the stock solution of luminol? B. Before investigating the scene, the

asked by Irvin on October 12, 2008
29. ## math

ok this is in my practice book. there are 33 students in the chess club. there are five more boys than girls in the club. write and solve a system of equations to find the number of boys and girls in the chess club?

asked by ariel on December 6, 2011
30. ## ap chemistry

A 37 mL sample of a solution of sulfuric acid is neutralized by 42 mL of a 0.113 M sodium hydroxide solution. Calculate the molarity of the sulfuric acid solution. Answer in units of mol/L

asked by cheri on March 5, 2013
31. ## Chemistry

The density of an aqueous solution containing 10% of ethanol (C2H5OH) by mass is 0.984 g/ml. A) Calculate the molality of this solution. B) Calculate its molarity. C) What volume of the solution would contain 0.125 mol of ethanol.

asked by Hilavidpreet on March 17, 2010
32. ## Chemistry

If 43.2 mL of 2.46 M HClO4 solution completely reacts with a 75.0 mL sample of a sodium hydroxide solution, what is the molarity of the sodium hydroxide solution? (hint: write the complete balanced rxn)

asked by Diane on October 10, 2014
33. ## Chemistry

a 20.0ml sample of HCL solution is placed in a flask with a few drops of indicator. If 30.0ml of a 0.240 M NaOH solution is needed to reach the endpoint, what is the molarity of the HCL solution?

asked by Ashleigh on April 15, 2013

A 11 mL sample of a solution of AlBr3 was diluted with water to 23 mL. A 15 mL sample of the dilute solution was found to contain 0.045 moles of Br-. What was the concentration of AlBr3 in the original undiluted solution? answer is 2.09 but i cant get it.

asked by Kate on February 16, 2012
35. ## Chemistry

A 230.-mL sample of a 0.280 M CaCl2 solution is left on a hot plate overnight; the following morning, the solution is 1.10 M. What volume of water evaporated from the 0.280 M CaCl2 solution?

asked by Ashley on June 21, 2013
36. ## Chemistry #11

A solution of ethanol (C2H5OH) is prepared by dissolving 35.0 ml of ethanol in enough water to make 120.0 ml of solution. What is the molarity of the ethanol in this solution? 46.07 g= molar mass of ethanol .079 g/ml=density

asked by Chelsea on October 14, 2013
37. ## Chemistry titrations

25.00mL of an unknown sulfuric acid solution is titrated to the second equivalence point with 21.02mL of 0.420M potassium hydroxide solution. What is the concentration of the sulfuric acid solution?

38. ## Chemistry

A 69 mL sample of a solution of sulfuric acid is neutralized by 41 mL of a .161 M sodium hydroxide solution. Calculate the molarity of the sulfuric acid solution. Answer in units of mol/L.

asked by Avery on March 1, 2016
39. ## Math

Dear kind-hearted tutor, Can you check my solution on this question? Given f' (x) = {2x - 1, x≤1; x^2, x>1, find f’ (1) if exist. Since it asks to find f’ (1). I choose the first derivative because it satisfies the condition for 1. 2 x – 1 = 2 (1)

40. ## Chemistry

1. Nitrogen monoxide is oxidized in air to give brown nitrogen dioxide. Starting with 2.2mol NO, how many moles and how many grams of 02 are required for complete reaction? What mass of NO2,in grams, is produced? Please show the solution step by step.

asked by Mitto on September 10, 2013
41. ## Math

Rational Equations Solve: How do you work it out? 1. x/4 - x+2/3 = 12 (x+2 are in the numerator) 2. 2y/4 - y/7 = y-3/2 (y-3 are in the numerator) 3. p/6 - 2p/5 = 4p-5/15 (4p-5 are in the numerator)

42. ## English

1. They were so happy enough even to forget to eat their lunches. (Is this sentence grammatical? Is the position of 'even' right?) 2. Where does she do volunteer work? 3. Where does she do the volunteer work? 4. Where does she do her volunteer work? (Which

asked by rfvv on October 10, 2010
43. ## Physics

The two ropes shown in the bird's-eye view of (Figure 1) are used to drag a crate 3.7 m across the floor. How much work is done by the force fk→? How much work is done by the force T1→? How much work is done by the force T2→?

asked by Tommy on July 22, 2015
44. ## Chemistry

The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6×108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1×105 and 6.3×108 molecules cm−3,

asked by Rebecca on March 25, 2014
45. ## Math

Simplify: 4^(-1/2) 4-1/2 = 1/41/2 = 1/2. check my work. On exponents, negative means reciprocal. 4(-1/2) means the same as 1/4(1/2) which is the same as 1/squareroot(4) so the answer is 1^4 no, of course not. The square root of 4 is 2 isn't it? so

asked by Alex on December 2, 2006
46. ## math

A railroad tunnel is shaped like a semi-eclipse. The height of the tunnel is 28ft and the total width is 50ft. Find the vertical clearance at a point 13ft to the right from the center. Please show all work that leads to your answer. Round your final answer

asked by Angie on August 16, 2017
47. ## organic chemistry

An unknown H2So4 sample of 25.00mL vl is titrated with 0.149 M NaOH. If 45.22mL of NaOH were needed to reach the pink endpoint, what was the molarity of the unknown acid? Show work using conversion factors????? H2SO+2NaOH --> Na2SO4+2H2O Dont know where or

asked by April on January 31, 2012
48. ## finance

Use the capital-asset pricing model to predict the returns next year of the following stocks, if you expect the return to holding stocks to be 12 percent on average, and the interest rate on three-month T-bills will be two percent. Calculate a stock with a

asked by ky on April 28, 2011

The graph give the acceleration a versus time t for a particle moving along an x axis. The a axis scale set by a=12 m/s^2. At t = -2s the particle's velocity is 10 m/s. What is its velocity at t = 6s. I know that I am supposed to used integrals to solve,

asked by Belinda on October 1, 2011

1. What is the value of b in the equation b + 8 = 13? A. 5**** B. 8 C. 13 D. 21 2. The steps below show the incomplete solution to find the value of x for the equation 7x − 3x − 4 = −1 + 21: Step 1: 7x − 3x − 4 = −1 + 21 Step 2: 7x − 3x − 4

asked by Alex on March 30, 2017
51. ## Physics - SHM

An oscillating block-spring system has a mechanical energy of 1.00 J, an amplitude of 11.2 cm, and a maximum speed of 1.08 m/s. (a) Find the spring constant. ___ N/m (b) Find the mass of the block. ___ kg (c) Find the frequency of oscillation. ___ Hz .. im

asked by COFFEE on April 12, 2007
52. ## Algebra

Solve the conjunction -2

asked by DANIELLE on January 24, 2007
53. ## Chemistry

If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formulas and states of all products. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution. CoCl2(aq)

asked by Amrita on November 23, 2010
54. ## Chemistry

Cynthia combines 1.7 grams of Silver hydroxide with 234 ml of a 1.2 M solution of HBr. Assume all the silver hydroxide dissolves once it is in solution(which is technically not the case, but for this example, just go with the flow of it). What will be the

asked by Kane on September 25, 2016
55. ## chemistry

a solution of sulphuric acid is titrated (allquot 20.0ml) with a solution of sodium hydroxide (0.1234M) 26.73ml of the base being required to the end point with phenolphthalein. calculate the molarity of the sulphuric acid solution

asked by payton on November 19, 2011
56. ## Chemistry

A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of the students titration volumes when using the NaOH solution to titrate the Oxalic Acid solution

asked by andrea on December 2, 2010
57. ## chemistry

Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.335-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of H2 are formed?

asked by ALEX on September 1, 2011
58. ## Chemistry a level

A solution of potassium permanganate (KMnO4) was standardised by titrating with 0.20 g of Na2C2O4 dissolved in 50 cm3 of acidified water. The endpoint was reached after 23.10 cm3 of solution had been added. Calculate the molar concentration of KMnO4 in the

asked by Rob on October 16, 2016
59. ## Biology

You have a stock solution with following components: glucose: 44 g/L NaCl: 191 g/L Tris Buffer: 275 g/L You mix 71 mL of the solution with water and bring the resulting solution to a final volume of 750 mL. What is the final concentration of glucose in

asked by Dee on February 10, 2015
60. ## Chemistry

Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.970-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of H2 are formed?

asked by Carolina on September 13, 2011
61. ## Chemistry

can anyone help me with this question A solution is made by dissolving 0.078g of Ca(OH)2 in water to make 100ml of final solution. Calculate the pH of the solution im not sure about how to use the 100ml. thanks -nad You need the 100 ml to determine

62. ## Chemistry

At 100 degrees C, pure H2O has a vapor pressure of 760 torr. An aqueous solution has a concentration of 1.90 M MgCl2. The van't Hoff factor is 2.45. The density of the solution is 1.09 g/mL. Calculate the vapor pressure of the solution.

asked by Ayaka on May 24, 2016
63. ## science

3.A weather station is located 300 miles directly east of a second station. Winds at the eastern station are blowing from the south. Winds at the western station are blowing from the north. What is true about the weather system near these two locations? A.

asked by Angelina on March 14, 2015
64. ## chemistry

Assignment 1 Question Consider a monohydrogen phosphate ( HPO42-) and dihydrogen phosphate (H2PO4-) buffer solution. [HPO42-] = 0.063M [H2PO4-] = 0.10M What happens when you add 1.0 ml of 0.10 M HCl to the a 99ml solution? What would the pH of the solution

asked by anonymous on January 26, 2013
65. ## Chemistry

An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by on January 21, 2011
66. ## chemistry

An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by Anonymous on January 28, 2008
67. ## college chemistry

An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by Alexander on January 24, 2010
68. ## chemistry

An aspirin tablet weighing 0.475 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by leah on January 26, 2009
69. ## chem

An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by Un on April 18, 2008
70. ## Chem.

An aspirin tablet weighing 0.400 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by Joanne on April 18, 2009
71. ## chemistry

An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

asked by John on January 27, 2008
72. ## physics

"An unbaked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the care can safely negotiate the cure?"

asked by Anonymous on October 17, 2010
73. ## ss

what was the main goal of suffrage leaders such as elizabeth cady stanton, susan b. anthony, and anita pollitzer? a. create a national temperance movement b. improve the prison system c. get women the right to vote d. ensure equal pay for equal work i am

74. ## Math

Factor the polynomial P(x)=x^3-2x^2-13x-10. Then solve the equation P(x)=0. This is what I got: P(x)=(x+1)(x^2-3x-10) P(x)=(x+1)(x-5)(x+2) When it says solve the equation P(x)=0 does it means solve for x? If so then x=-1 or 5 or -2 Correct??? please and

asked by Anonymous on April 3, 2012
75. ## TRIGONOMETRY HELP

Prove that: (tan²Θ)x(sin²Θ) = (tan²Θ)-(sin²Θ) show work

asked by CARL on March 4, 2013
76. ## algebra 2

take the square root of problem square root 64^6 please show all work

asked by lisa on December 12, 2012
77. ## Pre-cal/Trig

(tan/(1+sec)) + ((1+sec)/tan) = 2csc (Show all work please.)

asked by Katherine on February 21, 2011
78. ## logarithmic eq:

3logx = 6-2x Thanks This is a problem that is best solved by iteration, or graphing. I recommend graphing. There is no closed-form solution. You need to solve it by graphical or iteration (trial and error) methods. The answer is approximately 2.43, if the

asked by Jen on February 23, 2007
79. ## chemistry lab

so i'm trying to finish my lab and im trying to solve for the concentration, and the lab handout says "remember all the cl- from the original sample ended up in 100 mL of solution" The concentration i solved for (from my graph) was 9.8 ppm Cl....how would

asked by Anonymous on April 23, 2016
80. ## chemistry

Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL. a. ) -0.77 b. ) -0.83 c. ) -0.90 d. ) -0.98 e. ) -1.01 i got c) by converting density into concentration (mol/L) and then,

asked by Anonymous on November 2, 2008
81. ## summarize

Decision making is a process by which several possibilities are considered and prioritized, resulting in a clear choice of one option over others. Decision making is a fact of life personally and in business. We make dozens of decisions each day. Some

asked by Ralph on March 8, 2013
82. ## AP Chemistry

Determine a pH range for which a buffer system containing benzoic acid would be appropriate. Devise a recipe for preparing 1.0 L of buffer solution that contains a total of 0.150 mol of buffer components (acid plus conjugate base) and has a pH of 4.48. The

asked by Kelly on February 11, 2018
83. ## Chem

A solution is made by dissolving 26.9 g of NaOH in approximately 450 mL of water in a volumetric flask. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to total 500 mL of solution. Calculate the pH of

asked by Anonymous on February 27, 2013
84. ## chemistry

25ml of a solution of na2c03 having a specific gravity of 1.25g ml required 32.9ml of a solution of hcl containing 109.5g of the acid per litre for complete neutralization. Calculate the volume of 0.84N heso4 that will be compltetly neutralized by 125g of

asked by Fai on February 17, 2013
85. ## math

what does it mean for an ordered pair to be a soltuin of both equations? for example,for this system, is the ordered pair a solution of both equations? (2,2.4) 4x+5y=20 2x+6y=10

asked by Angie on April 1, 2009
86. ## Organic Chemistry

any o-chemists out there? Some help would be greatly appreciated. So I have this compound, it has 5 C's total, a bromine at one end and 2 methyl groups coming off the 3rd C from the bromine and an OH group at the end. like this: Br-CH2-CH(CH3)2-CH2OH. Now

asked by paul on May 10, 2015
87. ## chemistry

Sulfur and chlorine can react together to form S2Cl2. When 1.00g of this sulfur chloride reacted with water, 0.36g of a yellow ppt of sulfur was formed together with a solution contianing a mixture of sulfurous acid, H2SO3, and HCl acid. Use the above data

asked by hina on April 10, 2013
88. ## math

BOOKS A library contains 2000 books. There are 3 times as many non-fiction books as fiction books. Write and solve a system of equations to determine the number of non-fiction and fiction books.

asked by Sally on April 4, 2016
89. ## Chemistry

The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be

asked by Alexis on November 1, 2015
90. ## algebra

Please help, very lost Evaluate the exponential function for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph; submit the graph via the Dropbox. State the domain and the

asked by mar on September 11, 2010
91. ## Parents, Finances, and School-Age Children

The most important reason for caregivers to be able to work together as a team is that A. caregivers must show a good working relationship to licensing agencies. B. caregivers must often coordinate and share responsibilities and resources. C. children need

asked by Amanda on November 20, 2014
92. ## math

At Newport Dunes, it costs \$15 to rent a paddleboard, plus \$2 for each hour. Over a Balboa Bay club, the members can rent a paddleboard for only \$10, but have to pay \$4 for each hour. After how many hours would the paddleboards cost the same amount? Please

asked by ki on February 27, 2013
93. ## Math

Joel has \$20. He needs a calculator that costs \$12 and some notebooks that cost \$2 each. Part A: Write an inequality that can be used to find the number of notebooks,n, that Joel can afford to buy. 12+2n ≤ 20 PART B: What is the graetest possible value

asked by Jasmine on October 8, 2007
94. ## maths too hard

1a)write down and simplify all the terms of the binomial expansion (1-x)6. (b) use your expansion to evaluate 0.997^6 correct to 4d.p (c) when 0.997^6 was computed by a student, his result was 0.9817. Find the percentage error correct to 3d.p..... Plz help

asked by yopo on December 30, 2016
95. ## Chemistry

SHOW WORK A cylinder containing 48g of nitrogen gas at room temperature is placed on a scale. The valve is opened and 12g of gas are allowed to escape. Assuming that the temperature of the cylinder remains constant, how does the pressure change?

asked by Caitlyn on December 4, 2013
96. ## Teaching dogs tricks

Please check my answer thanks Owners who aren't interested in professional work but want to show off their dog's tricks to an appreciative audience might want to get involved in A. teaching obedience classes. B. pet therapy. C. teaching tricks classes. D.

asked by Sam on August 25, 2008
97. ## Math

Joel has \$20. He needs a calculator that costs \$12 and some notebooks that cost \$2 each. Part A: Write an inequality that can be used to find the number of notebooks,n, that Joel can afford to buy. 12+2n ≤ 20 ***PART B: What is the graetest possible

asked by Jasmine on October 8, 2007
98. ## statistics

SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 97.5? Show

asked by Anonymous on September 29, 2012
99. ## chem

λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 5. I am not certain of your difficulty here. Can you amplify? How did you make the symbol for lamda?

asked by Mary on October 2, 2006
100. ## SS

"Contrary to the vulgar belief that men are motivated primarily by materialistic considerations, we now see the capitalist system being discredited and destroyed all over the world, even though this system has given men the greatest material comforts." -

asked by Anonymous on May 20, 2016