1. Chemistry

What substance is acting as the Brønsted-Lowry base in the forward reaction below? H2O + NH3 yields NH4+ + OH-

2. profit and loss

a businessman purchased certain items worth rs. 1200 and after selling some items at the end of the first day made a profit of 16 % on items sold on that day. if his profit for the day was 4 % of his total purchases what is his stock at the end of the day

3. Chem

Suppose you have Avogadro\'s number of mini marshmallows and use them to cover the state of California which has a land area of 1.560 × 105 mi2. Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm. Assuming the marshmallows are packed

4. Chemistry, Heat and Phase changes(general chem II)

From the data below, calculate the total heat (in J) needed to convert 22.00 g of icea t -6.00 C to liquid water at 0.500 C. melting point at 1 atm: 0.0 C Hfusion: 6.02 KJ/mol cliquid: 4.21 J/g C csolid: 2.09 J / g C My answer is about 300 J short of the

5. Physics

An airplane with a mass of 1.20x10^4 kg tows a glider with a mass of 0.60x10^4 kg. if the airplane propellers provide a net forward thrust of 3.60x10^4, what is the acceleration of the glider? I'm thinking that I should add the masses and then solve using

6. Math

There are 42 pupils in a class. 3/4 of the boys and 2/3 of the girls travel to school by bus. The total number of boys and girls who travel to school by bus is 30. (a) How many boys are there in the class? (b) How many girls travel to school by bus?

7. Math

If a storage tank is holding 450 litres when it is three-quarters full, how much will it contain when it is two-thirds full?

8. Math

A sum of money is shared among three brothers. The eldest receives 7/13 of it and the 13 next receives 2/3 of the remainder. If the youngest brother receives \$6, find the sum of money shared.

9. algebra 1

you made two deposits to your bank account this month . One deposit was 17.92, and the second deposit was 15.33. Your balance at the end of the month is 72.31, and you made no withdrawals. Which expression shows your balance at the beginning of the month?

10. Math

James uses 1/3 of his land for growing durians, 1/4 for bananas, 3/8 for guavas and the remaining 9 hectares for mangoes. What is the total area of his land?

11. biomechanics

an orienteer runs 300m north and then 400m to the southeast (at a 45 degree angle to north). if he runs at a constant speed, how far away is he from the starting position?

12. profit and loss

to double the profit from the present 10 % the present selling price of rs.100 will have to be increased approximately to

13. algebra 1

Which statement about the product is true? 7.56*6.7 ̅? a)the product is irrational b)the product is rational** c)the product is neither rational or irrational d)the nature of the product cannot be deterined

14. Algrebra

Find K if the lines 3x-5y=9 and 2x+key=11 are a) parallel and b) perpendicular So for A) I have to find the slope, so would I set the x's equal to each other? And from there, I can find B) because the slope is just the reciprocal. I'm just having trouble

15. Math

An old book listed that 72 turkeys were bought for \$\\$\square.\square\square\$ each, at a total cost of \$\\$\square 67.9\square.\$ What was the cost of each turkey, if each \$\square\$ stands for a digit that was unreadable in the old book? Note: The \$\square\$

16. Hospitality and Tourism

Is this ethical behavior? Is it ethical to take office supplies from work for home use? No Is it ethical to use company time to solicit signatures for a petition nconcerning a current social issue? No If there are sslight defects in a product you are

17. Geography

A guy wire is attached on the ground 100 feet from the base of the tower. The wire is also attached to the top of the 300 foot tower. How long is the guy wire?

18. math

A pelican flies 2 and 1/4 feet above the surface of the ocean. A dolphin swims 10 and 1/2 feet below the surface. How far apart are the dolphin and the pelican? Show your work. I got 8 and 1/4. I think it's right but I just want to get another's persons

19. Math

If sinA+sinB=1/2 and cosA+cosB=1/2 then the value of tanA+tanB

20. Math 160

The position function of an object moving along a straight line is given by s = f(t). The average velocity of the object over the time interval [a, b] is the average rate of change of f over [a, b]; its (instantaneous) velocity at t = a is the rate of

21. algebra 1

you made two deposits to your bank account this month . One deposit was 17.92, and the second deposit was 15.33. Your balance at the end of the month is 72.31, and you made no withdrawals. Which expression shows your balance at the beginning of the month?

22. Chemistry

How many grams of NaN₃ must be decomposed to fill a 42.0 L airbag with nitrogen gas at a pressure of 1.05 atm and a temp of 29.5 degrees Celsius?

23. English

1. This is the same watch that I lost. 2. This is the watch that I lost. 3. This is the very watch that I lost. 4. This is the same watch as I lost. ------------------------------- Do #1, 2, and 3 have the same meaning? They mean that I found that I had

24. algebra 1

what is the simplified form of the following expression -28st over -4s -7t 7t** -7s 7s

25. math

If focus and directrix of a parabola are (3,-4) and x+y+7=0 then its length of latuusrectum is?

26. Algebra

Sally bought 12 tickets for a movie, an adult ticket costs \$9 and a child ticket costs \$5, if she spent a total of \$76, how many adults and children did she buy tickets for?

27. Math

A hot dog cart at the entrance of the Stadium sells hot dogs (\$3.50) and hamburger (\$5.25) for a total of \$1,225.00. If it sells twice as many hot dogs as hamburgers, how many of each did it sell?

28. Physics

In general, what conditions with observable effects make magnets interact with non-magnet materials?

29. math

If football team loses 3 yards, gains 12 yards, gains 10 yards, and then loses 15 yards. Did the team gain or lose yards overall? How many yards? Show your work

30. math

Patrick recorded the daily changes of the value of stock in dollars: -3.40, -8.09, -2.47, 1.86, and 3. 55. What was the average daily change in the stocks value in dollars. I got 1.71 but I think it might be wrong.

31. MATH

A number has three distinct digits. The sum of the digits equals the product of the digits. How many three-digit numbers satisfy this condition?

32. Calculus

If g(X) = 2+ln(x-5), find the inverse function, (g^(-1))(x) Solution: y = 2+ ln(x-5) e^y = 2 + x - 5 x = e^y + 3 y = e^x + 3 g^(-1) = y = e^x + 3 Is that right? I'm following an example - but don't really get it - how do I determine the domain and range -

33. Physics

A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did

34. World History

which statement best describes the period known as the old kingdom? a) it was a time dynastic uncertainty. b) it was a time of development. c) it was a time of great geographic expansion d) it was a time of disunity

35. Math

Kate's parents decided it was time to start giving her pocket money. They were not sure how much to give her so they started with \$1 for the first week and doubled it every week. How many weeks until Kate gets over \$20 pocket money?

36. principle of management

whilst entrepreneurship is a panacea to the world over, the current Zimbabwean situation is different .eludicate four reasons why the situation is different

37. Physics

PhysicsA race car travels northward on a straight, level track at a constant speed travels 0.755 km in 18.0 s. The return trip over the same track is made in 23.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run? 41.94

38. Physics

A ball is thrown straight up at an initial speed of 24 m/s. How long did it take to reach maximum height? How high did it rise before falling again? I am confused on how to attempt this problem. Please provide me with some guidance:)

39. Physics

A car uniformly accelerates from rest at 3 m/s^2 for 8 seconds. At the end of the 8 seconds the car uniformly brakes at -5m/s^2 for 4 seconds. What total distance is traveled by the car during the 12 seconds of motion?

40. Maths

A knife has a mass of m grammes. It is 20g heavier than a spoon. The mass of a knife and four spoons is 330g. Find the mass of the Knife.

41. Maths

A plane setts off from airport A and flies due east for 100 km, then turns to fly due south for 80 km before landing at an airport b show that the approximate bearing of airport b from airport a is 129

42. math

Given the four rational numbers below, find the greatest difference and the greatest product using two of the numbers for each operation. 2 1/3,1.5, -1.25, -3 1/4 Difference= -0.95 is what I got for the first answer. Product= 4.0925 is what I got for the

43. physics (Simple harmonic motion)

X(t)=0.142sin(2t+0.19) b) Find the travelled distance by block at t2=3.5min [37.963m].

44. English

1. Though the baby was left alone, she didn't cry. 2. Being left alone, the baby didn't cry. 3. Left alone, the baby didn't cry. (Are the three sentences all grammatical?) 4. Although he had been very tired, he couldn't quit the job. 5. Having been very

45. Math

As part of the 'Learning Journey' program, 73 pupils travelled on two buses, one air-conditioned and one non-air-conditioned, to the Singapore Discovery Centre. Three-fifths of the pupils on the air-conditioned has wee girls. There were 17 boys in the

46. Math

The mathematics club in a school has 53 members. 5/7 of the girls members and 3/5 of the boys members are from lower secondary. The total number of lower secondary members is 35. How many members of the club are boys?

47. math

Which of the following equations are true. Select all that apply. A. 7+(-7)= 14 B.-4+9= 5 C. 3-(-10)=-7 D. -2-6= -8

48. math/Calculus

If h(x) = csc(x), find the inverse h^(-1)(x). express answer in terms of sin^(-1), cos^(-1) or tan^(-1) Don't know where to start -

49. physics (Simple harmonic motion)

In a horizontal block-spring system,the block mass is m=0.5kg and the spring constant is k =2N/m. At t1=0.1s the block velocity is +0.263m/s and the acceleration is -0.216m/s2. Assuming that the system is undergoing SHM.Write the expression for block

50. science

Prove that the maximum horizontal range is 4times the max height attaind by projectile when fired at an inclined so as to have max. Horizontal range

51. Algebra

Special factorization I know someone has helped me with this before, but I'm really stuck on how to attack these two problems [(8x^3)/125]+[64/(y^3)] X^2-8xy+16y^2-25

52. English

1. When he was playing the piano, his brother came in. 2. He playing the piano, his brother came in. -------------------------------------- 3. While he was walking along the river, he was listening to music. 4. Walking along the river, he was listening to

find a set of parametric equations for the line that passes through the given points. (-9, 5, 1), (2, -3, 8)

54. math

You are completing a tax form. The tax is 15.3% of \$44,000. Calculate how much you have to pay

55. maths

Shyam wishes to determine the distance between two objects A and B but there is an obstacle between the two objects which prevents him from making a direct measurement. He design an ingenious way to overcome this difficulties. First, he fixes a pole at a

56. Science

MMR causes autism Help with the connection between MMR vaccine to autism pros and cons

57. Math

Mary has two tanks of fish. If she transfers 15 fish from the larger tank to the smaller tank then the number of fish in the smaller tank will be 5/7 of the number of fish in the large, tank. Given that there are 35 fish in the smaller tank originally,

58. math

Tell me whether each fraction. 1/n, is given as a terminating decimal or a repeating decimal for the given rules of n. Write t for terminating or r for repeating. It starts at 2- 10 which are t and r.

59. Math

State the domain and range of f(x) = 2sin(sort(3x-1)) + 3

60. English

Hello. I would be very grateful for your help. 1) Please help me with articles. I'm writing about a particular company. Should I use the definite article or no article in the following context: "(the ?) costs are likely to be higher than (the?) revenues".

61. Calculus

Find the zero(es) of f(x) = (e^(7-2x)) - 1

62. English

Dear Writeacher, thank you for your answers. Will you help me with a few more sentences? 1) Which is correct in the following sentence: "She has remained without her colleagues OR / AND friends in a closed space." (I think it's OR) 2) Is the sentence

63. Calculus

e^(1+2lnx) ----------- x^2 simplify

64. Calculus

log base 4 of 8/log base 8 of 16 question is to simplify can you rewrite it this way? 4^x = 8 --------- 8^x = 16

65. Calculus

State the domain and range of the function f(x) = 2sin(sqrt(3x-1)) + 3 Why is this so difficult?

66. math

-23 4/7 + (+ 34 1/6)= I didn't get it can anyone help me!!!! Please I got to study for this test tuesday

67. algebra

\$2000 principal earning 3% compunded after 6 years? how do i solve this? i don't need answers i just don't know what the equation is.

68. willimington

Draw two ER diagrams for the enterprise described below: one using standard (Chen) notation (that one is hw #2), and one using ordered pair (Merise) notation (this one being hw #3). Indicate clearly which is which. Remember to indicate keys and

69. math

Your bill at a restaurant is \$29.97. You want to leave about 20% for a tip. Estimate the amount of a tip. (Round your answer to the nearest cent.)

70. math

How to post 35252 in expanded form

71. math

The sum of all digit is 21 none of my digit are same.i am the smallest 7 digit number made of these digit who I am?

72. algebra 1

what is the value of xy over w if x=-3 y=4 and w=-6 2 -2 1over2 -1over2

73. Math

I am a mutiple of 4 I am between 6 and 15 I am also a factor of 16 what number am I

74. Calculus

Hi, please I need help with this demonstration: If “f” , “g” :[ 0,1]→R are continuous functions, they are differentiable in (0,1), f(0)=0, g(0)=2 and │f ‘ (x)│≤1 ,│g ‘ (x)│≤1 for the interval (0,1). Prove that f(x) < g(x) in

75. Algebra

Simplify 4√490k^2