1. chemistry

•Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8 x 10–5; Kb for NH3 is 1.8 x 10–5.) a)0.20 M HC2H3O2 and 0.20 M NaC2H3O2 b)3.0 M HC2H3O2 and 3.0 M NH4Cl c)0.20 M NH3 and 0.20 M NH4Cl d)3.0 M NH3 and

3. What does Johnny’s mastery of riding Goblin show about his character? (1 point) He is rash and quick-tempered. He is brave and determined. He is immature and selfish. He is arrogant and proud. 4. Which of the following statements most accurately

3. math-algebra HELP!!!!

1) A gym charges a one-time sign-up fee and then a regular monthly fee. The cost of a membership as a function of the number of months as a member is shown for 2010 and 2011 on the graph. a. What characteristics of the graph represent the sign-up fee and

4. Math

Kevin had 3/4 yd of string. He used 1/3 of it on a school project. How much string did he use? A.5/12 yd B.1/3 yd C.7/12 yd D.1/4 yd (numbers are all fractions)

5. physics

A bungee jumper of mass 75 kg uses a bungee cord with a relaxedlength of 50 m and jumps from a bridge that is 170 m above the ground. What elastic force constant is necessary for the bungee cord in order for him to jump safely. I have no idea what to do or

6. Mathematics

A cylindrical tube, open at both ends, is made of metal. The internal diameter of the tube is 10.4cm and its height is 25 cm. If thickness of the metal is 8mm everywhere, calculatd the volume of metal in the cylinder

7. Analytical Geometry

A 10 foot long ladder is leaning against a vertical wall with the top of the ladder 8ft from the ground. What is the slope of the ladder? How far is the foot of the ladder from the wall? Can a 6 foot tall man walk under the ladder 1 foot from the wall?

8. chemistry

So I did a titration lab at school with NaOH and HCl. i have to find: - volume used, NaOH - Moles of NaOH - Moles of HCl -Volume used unknown HCl - Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH:

9. Math

John was visiting three cities that lie on a coordinate grid at (-4, 5), (4, 5), and (-3, -4). If he visited all the cities and ended up where he started, what is the distance he traveled? Round your answer to the nearest tenth. (like 3.2 or 5.7)

10. physics

a pendulum 3m long is displaced at an angle of 40 degrees. What will be the maximum velocity of the pendulum when it is released to oscillate?

11. History

1. Who controlled the most territory bordering the Louisiana Purchase? A- Spain B- France C- Great Britain D-Mexico 2. Which of the founding fathers was an author, a statesman, and a scientist? A- John Adams B- Benjamin Franklin C- Thomas Jefferson

12. Math

Compare the models for 1/3 and 2/6. How does the number of parts relate to the sizes of the parts?

13. physics

The small piston of a hydraulic lift has a cross-sectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?

14. maths

the total revenue and the total profit functions (in Ringgit) of a product are given as follows: total revenue :R(x)= x^3-95-800x total profit: P(x)=1/3x^3+800x-120 where x is the number of units produced and sold. find the level of production in which the

15. math

The weekly marginal cost functions C'(x) and the weekly marginal revenue function R'(x) of a company assembling personal computers are given by C'(x) =RM(3x^2-118x+1315) and R'(x)=RM(1000-4x), where x is the number of computers assembled per week. If the

16. computer science check

Which of the following examples correctly describes the order in which these parts of a program should be written? (Select the best answer.) A- The import command, then function definitions, then function calls B- Function definitions, then the import

17. History

1. How is the Seven Years War related to the French and indian war? A- The French and Indian War directly caused the Seven Year's War B-; The French and Indian War was part of the Seven Year's War C- The Seven Years' War was more of a land war than the

18. PHYSICS

A uniform plank with mass 20kg and length 12m extends 2m over the edge of a building. A 40kg crate is slid out on the plank. how far can the crate be pushed without toppling the plank? A. 0.5m B. 1m C. 1.25m D. 1.5m E. 2m

19. Physics 11

A 1.00 x 10^4 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is the efficiency of the motor? I did P=W/t (1.00x10^4 x 45 =W) And got 4.50 x 10^5 Then I did Ep' = Ek 955 x 9.81 x 25 = 234213.75 But

20. maths

Given the demand function:p(x)=-0.5x+500 where p is price in RM per unit and x is the quantity demanded and the marginal costfunction C'(x) = -0.5-480, and the fixed cost =RM 900, find a) the level of production that will maximise profit b) the maximum

21. physics

a wooden block of mass equal to 15kg is pressed against a spring. The spring has constant of 225N/m. If the spring is compressed 0.15m, how fast will the block travel when released?

Would like to know which courses I qualify in with the above subjects

23. maths

find the turning points for the curve y=2x^3-1/2x^2-x+5. Determine the nature of the turning points. Appreciate your help

24. physics

A 3kg mass is attached to end of a light rod and made to move clockwise in a vertical circle of radius 2m and speed of 6m/s. The tension in the rod at the lowest point is most nearly A. 54N B. 84N C. 30N D. 24N E. 39N

25. Derivative

Evaluate the following: a) S (4x^2+3)/x^2 dx b) S 4x(x^2+3) dx Please help and show the working so that I can understand as I hv no foundation in derivative. TQ

26. chemistry

what is the volume, in liter of 2.54 mol methane (ch4) gas? I've been stuck on this problem for hours, someone please help!

27. physics

a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? A. 10m/s B. 6.3m/s C. 16.3m/s D. 11.8m/s E. 139m/s

28. math

Janice needs to figure out her cell phone bill. She is charged a monthly flat fee of \$45. She is also charged \$0.25 per minute. How many minutes dis she use if her cellphone bill was \$145. write an equation and solution

29. Physics

An optical fiber is made of a clear plastic with index of refraction n=1.6, For what angles with the surface the light remain contained within the plastic guide?

30. English

Hi. Can someone explaint the message the poems "The lamb" and "The tyger" By William Blake .. I need to know what was his message ? I read many websites and STILL don't understand. Thanks !

31. Algebra I

your class sells 64 tickets to a play. A student ticket cost \$1. An adult ticket \$2.50 If you collect \$109 in total ticket sales, how many adult tickets do you sell? please show how to solve

32. physics

a car rolls down a ramp 4m long that has angle of incline equal to 37 degrees. If the car starts from rest, what will be its velocity at the bottom of the ramp?

33. Maths

If the 6th term of an arithmetic sequence is 48, and the sum of the first 6 terms is 300, what is the first term and the constant difference?

34. Maths

If the 6th term of an arithmetic sequence is 48, and the sum of the first 6 terms is 300, what is the first term and the constant different?

35. Math

An orchestra buys music stands for \$42 each with \$298 in its bank account. Write a function rule that shows how the account balance depends on the number of stands bought. What are the initial value and rate of change of the function?

36. Math

Find the product 14.4/5 of 30 A. 24 B. 8 C.30 4/5 D.20 15. 14 * 3/5 A.42 B. 20 C. 8 2/5 D.28 3/5 16. 3/10 * 2/10 A.3/50 B. 1/10 C.3/5 D.1/10 17. -4 1/3 * 1 3/5 A. 4 1/5 B. -4 4/15 C. 5 1/5 D. -6 14/15 18. 2 3/7 * 2/3 A. 1 17/21 B. 2 1/21 C. 1 4/7 D. 1

37. computer

mention 2 instructional materials that can be prepared using Microsoft word?

38. Algebra

Blending spice: Spice of life sells ground sumac for \$1.35per ounce and ground thyme for \$1.85 per ounce. Aman wants to make a 20 oz Zahtar seasoning blend using the two spices that sells for \$1.65 per ounce. How much of each spice should Aman use? I know

39. Pre-calc/Trig

For each parabola, find the vertex and focus. x= (1/400)y^2 y= 1/8(x-3)^2-1

40. English/grammar

All of your hard work and dedication has molded you into an amazing young lady. or All of your hard work and dedication have molded you into an amazing young lady.

41. physics

Now how far the will the ball in the problem below will hit the ground? a. 10m b. 6.4m c. 9.6m d. 20m e. 140m a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? V^2 = Vo^2 + 2g*h V^2=0^2+2*9.8*2

42. Physics

A 3kg mass is sliding across a horizontal surface at a constant speed while being pulled by rope with tension 20N held at a 53 degree angle above the horizontal. The force of friction is most nearly A. 30N B. 12N C. 16N D. 20N E. 1N

43. Physics

how much work is done to drag a 25kg sled 80m?

44. physics

what is the power if it takes 11s to drag the sled 80m?

45. physics

a toy car rolls horizontally on to ramp that has total height of 1.28m. What minimum velocity will aloow the car to reach the top of the ramp?

46. Chwmistry

how much in calories is required to raise the temperature of 415 grams of chloroform from 21.4 degrees c? The specific heat of chloroform is 0.23 cal/g°c. How many joules does this equal?

47. Maths

I purchased a product that was listed at RM 2000. If a chain discount of 10%, 5% and a 2% were given and a chain discount of 5% was also given for prompt payment, what was the net price that I paid?

48. maths

Find dy/dx for the following: a) y=3x^2 - 3x b) y=x^3(3+5x)^2 c) y=(x^2+1)^2/2x Please offer your help as I urgently need help

49. Algebra 1

Translate problem situation to a system of equations. Do not solve. The sum of two numbers is 10 the first number is 2/3 of the second number. What are the numbers? would it be 6, and 4? or 7, and 3? I know 2/3 of 10 is 6.66666667, so being after the

50. math

a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable

51. Math

tom is eight years older than steve. three years ago, steve was two years more than one third as old as tom was then. how old is tom now? answer pls

52. math

the ninth term of an arithmetic progression is 52ind the and the sum of the first twelve terms is 414.find the first term and the common difference.

53. maths

find the equation of the tangent to the curve y=4x^2+5 at the point (2,21).

54. Pre-calc/Trig

For each parabola, tell in which direction the graph opens. x= 1/2y^2 y= -1/24x^2

55. Algebra 1

6x^3-3x^2+x-40 Divided by x-2

56. Math

Could someone please help me. Solve the linear equation by substitution. Y=10-2.2x 5x+y=70 For the first equation I am getting x=21.4 and for the second equation I am getting y=-37. The answers are 21 3/7 and -37 1/7. Could you show me how you do this so I

57. Pre-Calc

A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how

58. math

un scramble math word roetopodsaoenrfir

59. math

roetopodsaoenrfir need to unscramble for a math paper

60. Calculus

a balloon rises straight up to 5 ft/sec. and a crying child who lost the balloon is standing 40 ft away. how fast does the balloon move away from the child when it is 30 ft above the ground?

61. Math

Identify this polynomial as a perfect square trinomial, a difference of squares, or neither. 9a^2+9a+36 Is it difference of squares?

62. Physics

A 2kg mass moving at 10m/s slows to speed of 4m/s while sliding across a rough horizontal surface. The work done by friction is most nearly A. 116j B -116J C. 84j D. -84j E. -16j

63. Physics

a 4 kg object is taken to a planet that has 3 times the mass of earth and 1/2 the radius of earth. On this planet the mass of the object will be most nearly.. A. 12kg B. 3kg C. 48kg D. 4kg E. 24 kg

64. Chemistry

How would you determine if a given compound is acidic, basic or neutral? Also if given a compound, how would you determine if the state is aqueous (without a chart)?

Given that

66. physics

An acceptable unit for power would be A. kg-m/s B. kg-m-m/s/s/s C. N/s D. Kg-m-m/s/s E. J-s

67. maths

If I borrow RM 100,000 to buy a house and I have to pay RM 3000 a month into an account that charges 5 % p.a compounded monthly, how many payments are needed to fully settle the loan?

68. Derivative

if g(x)= 5x^6-3/x^2, find the 3rd and 5th derivative of the function. Pls help!

69. Maths

a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable

70. Chemistry

Calculate the number of atoms in 2.58 mol antimony. Its an example problem, I need help!

72. probability and statistics

a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied

73. english

What does don't let me hit the ground means? it's part of the verse in the song i chose to present in school please just give me an idea on what those words mean

74. math

Mabel is installing a square pool in her backyard and wants a circular fence to enclose the pool to create 4 grassy areas around the pool as show in the figure. If the pool is located at the coordinates (1, 5), (5, 8), (4, 1), and (8, 4), what is the

75. math

Draw a number line counting by 10s for 240

76. mathe

what is the velue of tan 37.5

77. Trig/Precalc

So I have two questions that have been puzzling me for quite some time and would really appreciate any help with either of them! (a) There are four positive intergers a, b, c, and d such that 4cos(x)cos(2x)cos(4x)=cos(ax)+cos(bx)+cos(cx)+cos(dx) for all

78. physics

A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and then accelerates at 2m/s squared for 10s.A/ SKETCH A SPEED TIME GRAPH FOR THE WHOLE MOTION GIVING YOUR VALUES ON BOTH

79. Math

7 billion chocolate chip cookies are consumed annually. In order to find out how many cookies are consumed on average by every person in the United States, what other information would you need to know in order to solve the problem?

80. Science

Would there be as much variety to living things if meiosis did not occur?

81. math

If the temperature is 3°f at 10:00 p.m, and the temperature falls four degrees overnight, what is the resulting temperature

82. Algebra 1

x^4-9x^3-7x^2-8x+2 Divide by x^2+x+1 Thanks

83. Fitness and nutrition

What are the signs of heat exhaustion

84. Pre-calc/trig

5=log3(x^2+18)

85. physics

explain why carrots look orange