1. profit and loss

two thousand people live in business village of which 55% were male. the male population earned 5 % and female population earned 8% on an investment of rs. 50 each. find the change in the % profit of the village if the ratio of male to female gets reversed

2. Chem Help - Thank you!

Explain the following: 1) Ethylene, C2H4 is a planar molecule, but hydrazine, N2H4, is not 2) ICl2- is linear, but NH2- is bent 3) Of the compounds mercury(II) cyanate, Hg(OCN)2 and mercury(II) fulminate, Hg(CNO)2, one is highly explosive, the other is

3. Math

Logarithms 3^x-2=18 Work log(3^x-2)=log18 (x-2)log3=log18 xlog3-2log3=log18 x=log3/(log9-log18) e^3x+1=10 lne^3x+1=ln10 3x+1=ln10 I'm stuck here 8^x=5^2x-1 xlog8=(2x-1)log5 xlog8=2xlog5-log5 x=log10/(log5-log8) Are these right?

4. Differential Calculus

A water trough is 10 m long and a cross section has the shape of an isosceles trapezoid that is 30 cm wide at the bottom, 80 cm wide at the top, and has height 50 cm. If trough is being filled with water at the rate of 0.2 m^3/min how fast is the water

At most, how many 4d electrons can an atom have? Of these what is the maximum number that can have ms= -1/2? A 5f electron has what value of quantum number l? What values of ml may it have? Also please explain how you got the answers so I can understand?

6. Chemistry

How many grams of ice are needed to cool 250 ml of water from 75 degrees Celsius to 5 degrees Celsius? (m_ice * 6.01kJ) + (m_ice * 4.18J/g°C * (5-75°C) = -[250mL * 4.18J/g°C * (5-75°C)] ???

7. 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

8. Chemistry

How much heat is evolved in converting 1.00 mol of steam at 155.0 ∘C to ice at -45.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C).

9. math

Vista county is setting aside a large parcel of land to preserve it as open space. the county has hired Meghan's surveying firm to survey the parcel which is in the shape of a right triangle. the longer leg of the triangle measures 5 miles less than the

10. Chemistry

two aqueous solutions (solution A and solution B) contain different non reactive solutes and have densities of 1.021 g/ml and 1.190 g/ml, respectively. when 40.00 ml of solution A is mixed with 10.00ml of solution B what is the density of the mixture? im

11. math

Before it can be used, a 12-ounce container of liquid fertilizer must be mixed with 48 ounces of water. What fraction of fertilizer is in the final mixture?

12. Science

Calculate the energy release in 1 gram of Uranium 235

13. Chem

for the dimethylthiocarbamate ion [OSCN(CH3)2]-. Add bonds and electron lone pairs in order to give the important resonance structures of this ion, including any formal charges where necessary. Select the resonance structure likely to provide the best

14. chem

calculate volume of excess KOH(aq) and the volume of 6.00M H2SO4(aq) to neutralize it

15. English

1. While she felt embarrassed, she ran out of the room. 2. Feeling embarrassed, she ran out of the room. 3. Embarrassed, she ran out of the room. -------------------------------- Are they all the same in meaning? Can we remove 'Feeling' in Sentence 2?

16. math

8 janitors can clean the college grounds in 3 hours. how long will it take 6 janitors to clean the college grounds?

17. profit and loss

a man gains 20 % by selling apples at a certain price. if he sells it at rs. 1.2 higher than the previous price he gained 40 % find original cost price

18. Calculus

Consider the following planes. 5x − 4y + z = 1, 4x + y − 5z = 5 a) Find parametric equations for the line of intersection of the planes. b) Find the angle between the planes

19. Math

How many sets of 3 primes sum to 20?

20. math

a proton in a magnetic field follows a path on a coordinate grid modeled by the function f(x) = x^4-2x^2-15. what are the x-coordnates of the points on the grid where the proton crosses the x-axis?

21. math

A printer has 15 rolls of newsprint in the warehouse. What fraction of this total will remain if 6 rolls are used?

22. Physics

Is KNO3 soluble in KOH solution?

23. physics

Find the resultant of the following two displacements; 2.0 m 40 degrees 4.0 meters at 127 degrees. the angles are taken relative to the x-axis

24. math

Mr. Rozario bought some numbers of apples and oranges in a ratio of 2:3. He gave away 2/3 of the apes to his sister and 23 oranges to his brother. The ratio of the number of apples to the number of oranges that he has now is 3:2. How many apple did he buy?

25. Science

500g of water at 100°c is mixed with 300g of water at 20°c.specific heat capacity of water is 4.2Jg°c.find the final temperature of mixture. (Physics)

26. physics

a car is moving at 17.7 m/s when it begins to slow down with a deceleration of 2.5 m/s2. how long does it take to travel 20 meters as it slows down

27. Physics

A 1500 kg car is travelling at 20 m/s. It brakes to a stop causing the brake pads to heat up from 25 degrees Celsius to a temperature too hot to touch. The total mass of the pads altogether is 4.0 kg and their heat capacity is 8.9 x 102 J/kg0C. If these

28. Science

An arrow is shot vertically upwards with an initial velocity of 14 m/s . Calculate the height reached

29. Math

The sum of five consecutive numbers is 645. Find the numbers.

30. math

there are 36 rows in a cinema hall.if the capacity of the hall is 600 people at a time then what will be the minimum number of seats in each row?

31. Maths

A man leaves 2/3 of his property for his wife , 1/3 of his property for his daughter and rest fo r his son what part does his son receive?

32. Physics

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

33. stats

scores on a University exam are normally distributed with a mean of 68 and a standard deviation of 9. use the 68-95-99.7 rule to answer the following questions 1) what proportions of students score between a 59 to 77? 2) what proportions of students score

34. English Writing

People believe in God because... And there is life on earth because... And people who believe in God think that God has put human beings on this earth because... Could you help me? I'm not English speaker so I don't know how can I write continue of these

35. MATH

A FACTORY IS TO PACK PENCILS IN BOXES OF 8 AND 10 PIECES WHAT IS THE SMALLEST NUMBER OF PENCILS THAT CAN BE PACKED USING THE BOXES? SHOW YOUR SOLUTION

36. Math

Ali has a rectangular pool around which he wants to construct a fence. The pool is 10 m long and 6 m wide, and he wants the fence to be 2 m from the edge of the pool on all sides. He want to pave the area around the pool and within the fence. How many

37. Math

Write three equivalent ratios for 15/9

38. chemistry

i.Calculate the volume of carbon ivoxide given off at stp when 20gram of octane is burnt in excess air (c=12,1+=1 gmv of any gass is 22.4dm^3 at stp). ii. Deduce the formula of a hydrocarbon with general formula cnH2n-2 of its molar mass in 110.

39. Chemistry

Why is it important to keep the beaker containing the mobile phase covered while preparing your chromatography paper and developing your chromatograms?

40. Calculus

I can not seem to get this right Find an equation of a sphere if one of its diameters has endpoints (5, 5, 5) and (7, 7, 7).

41. algebra

90 students from three different classes, A, B, and C are going on a field trip. Class A has 32 students and Class B has 28 students. Write an equation to describe the situation.

5. Shara's new lawn sprinkler watered a circular area with three times the radius of the old sprinkler. How many times greater was the area watered by the new sprinkler than the area watered by the old sprinkler? a)3 b)6 c)9 d)36 6.How many x-intercepts

43. English

1. What animals live in Canada? 2. Which animals live in Canada? 3. What animal lives in Canada? 4. Which animal lives in Canada? - Many animals live in Canada. ------------------------------------ Which questions are suitable for the answer?

44. Math

One positive number is one-fifth of another number. The difference between the two numbers is 160, find the numbers.

45. Physical Science

You drop a water balloon off of a tree branch, and you time the drop time at Δt = 0.8 sec, from the instant you drop it to the instant it impacts the sidewalk. What is the height of the tree branch?

46. Math

A farmer had sheep and end.altogether 124 legs, how many sheep and hens

47. 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

48. Trigg

A force vector has a magnitude of 475 newtons and points at an angle of 26.0 degrees below the negative x axis. What are the x scalar components and y scalar components?

49. chem 2

0.946g Al in 35 ml of 2.00M KOH and obtained 13.8g of dry alum. calculate the theorecital and actual yield %

50. P-Chemistry

A closed vessel of volume 2.50 dm3 contains 100g of nitrogen (N2) and 100g of carbon dioxide (CO2) at 25 C. What are the partial pressures and mole fractions of each gas? Can you check my answers.Thank you. I got Partial Pressure for N2=34.95 atm CO2=22.24

51. math

can I distrubute this? 4pi (M/2pi*RT)^(3/2) ?

52. Math

Chris has a 10 foot long strip of red ribbon and a 15 foot long strip of blue ribbon. A] draw a diagram to show the relationship of the length of the red ribbon to the length of the blue ribbon. B] write a ratio to describe the relationship of the length

53. math

A ridge beam rises 18 in. over a horizontal run of 72 in. Calculate the pitch of the roof and express it as a fraction with a denominator of 12.

54. physics

An object 4cm high is placed 25cm from a covering lens of focal length 15cm the image height is

55. nath

Lucy has 80 foreign stamps and 128 Philippine stamps. She separates the two kinds of stamps in her album and she puts the biggest and the same number of stamps of each kind on a page. If all pages with stamps in her album are full and there are none left

56. math

write down your age. add 5 to it.Multiply the sum by 2. subtract 10 from it. next divide it by 2. what do you get?

57. Math

If there are 5 boys and 7girls, in how many ways can 5 boys and 5girls sit in a round table? Is the ans : 5!*4!*7c5? Reason: since there are 5 boys so (5-1)! And left 5 seats for girls so 7c5 and within the girls theres 5 diffrent ones so another 5!

58. Algebra

Angelica has 15 comic books and each month she buys 3 more comic books. Write an equation representing the number of comic books c she has at the end of any month m

59. maths

can someone explain this: how is having a square in the denominator equivalent to taking the reciprocal and raising it to the 1/2 power? EX: here's an identity: let x= 1/(2a^2) a = M/2RT so can this be rewritten as: (1/2)(2RT/M)^(1/2)

Cynthia used some of the ordered pairs from the set below to make a new set. {(4, –3), (–2, 5), (5, 4), (7, 2), (2, –7)} She wrote the domain of this set as {2, 4, 5}. Which ordered pairs from the original set did Cynthia use to make her new set?

A line segment has end points of (4, -4) and (0, 5). What are the coordinates of the midpoint of this line segment? A) (2, 1/2) B) (-2, -9/2) C) (4, 1/2) D) (8, -13)

62. science

what functions do individual cells perform that are similar to the functions of our bodies?

63. math

Home Center sells rectangular picture frames. The ratio of the length to the height in centimeters is 7:5. What would be the length of a frame that is 15 centimeters high?

64. Math

Factoring using the GCF x^3y^4 + x^2y^2=

what functions do individual cells perform that are similar to the functions of our bodies?

Dino used three pieces of string to make a model of a triangle in art class. the lengths of two of the pieces of string were 3 inches and 7 inches. which could be the length in inches of the third piece of string dino used? A) 2 B) 8 C) 5**** D) 3

67. MATH HELP

Two sides of a triangle have lengths of 8 inches and 12 inches. What could be the length of the third side? A) 2 in B) 4 in C) 16 in**** D) 20 in

68. Pre algebra

On the map 5 miles corresponds to 2 inches. How many miles correspond to 7 inches?

69. Chemistry

A piece of metal with a mass of 131 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?

70. math

give me an answer . Chris has a 10 foot long strip of red ribbon and a 15 foot long strip of blue ribbon. draw a diagram to show the relationship of the length of the red ribbon to the length of the blue ribbon

71. Statistics

A movie theater has a super ultra combo meal. It includes the option of a large popcorn, a soda, a slice of pizza, and a box of candy. There are 12 types of toppings for the popcorn, including no topping. There are 5 types of toppings for the pizza,

72. value

A Bicycle Wheel D=70cm Is Making 25 Rev. In 10secs.Find Speed

73. Algebra

In a recent year, a single person could expect to pay \$4200 in income taxes on an adjusted gross income of \$30,000. How much more tax should the person expect to pay if her adjusted gross income increased by \$3000, knowing that this would not move her into

75. maths

Find the future value of \$1200 invested at 5.25 % per annum payable annually after 6 months?

76. Prealgebra

It is recommended that for every 8 square feet of surface, a pond should have 2 fish. A pond that has a surface of 72 square feet should contain how many fish?

77. Math

If helen can type 150 words in 5 minutes how long will it take her to type 2400 words

78. Statistics

The average score for a business examination comprising 300 students is 54%. If the marks are normally distributed with a standard deviation of 8%, determine the number of students scores above 70%.

79. 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?

80. 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,

81. Sociology

What did industrialization have to do with Max Weber? I understand that he thought that rationalization would lead to a caged society, but what does that have to do with industralization?

82. Math

A ferrari is heading west at 30 m/s. A Cop turns on its lights and the ferrari speeds up to 60 m/s in 7 seconds to outrun the police. What was the acceleration of the ferrari?

83. P-Chemistry

A closed vessel of volume 2.50 dm3 contains 100g of nitrogen (N2) and 100g of carbon dioxide (CO2) at 25 C. What are the partial pressures and mole fractions of each gas?

84. statistics

Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.

85. Calculus

a) Find parametric equations for the line through (4, 1, 4) that is perpendicular to the plane x − y + 2z = 7. (Use the parameter t.) b) In what points does this line intersect the coordinate planes? xy-plane? yz-plane? xz-plane?

86. math age problem

I am 10 less than four times my age six years ago how old am I now

87. College Algebra

You spend \$1000 on a computer and for tax purposes chose to depreciate it (or assume it decreases in value) to \$0 at a constant rate over a 4-year period. a) calculate the rate of chage of the assumed value of the equipment over 4 years. The rate of change

88. math

if V(r)=4/3 pir^(3) find (v2r)/(vr)

89. Pre algebra

Find the constant of variation when y varies inversely as x, and y=8 when x=5

90. Math

The circumference of earth is about 40,030.02km. The formula for circumference is c=2(3.14)r.jennifer determines the radius of earth is about 12,700km.use estimation to determine if Jennifer measurement is reasonable.

91. Pre algebra

Find the constant of variation if y varies directly as x, and y=17 when x=34

92. Language Arts (Books)

How does the writer use Elphaba to convey a message or a lesson in the book Wicked?

93. profit and loss

Dea bought 100 kg of rice for rs 1100 and sold it at a loss of as much money as he received for 20kg of rice. ?

94. math 1050

how do I find the answer to if the point (5,-3) is a point on the graph of f then f(?)=(?)

5x -7(2-4x)

96. Math urgent

X,Y and Z can do a piece of work in 15 days. If X takes twice as much as Y and Z together and Y takes thrice as much as X and Z together, how long days will each take to finish a work.

97. English (grammar)

The players were playing hockey

98. Maths

X,Y and Z can do a piece of work in 15 days. If X takes twice as much as Y and Z together and Y takes thrice as much as X and Z together, how long days will each take to finish a work.

99. Math

Orange juice concentrate is mixed with water in the ratio 1 pary concentrate to 5 parts water.How many parts orange juice are needed for 25 parts of water?

100. English

1. Jenny is in the coffee shop, drinking coffee. 2. Jenny is in the coffee shop while she is drinking coffee. 3. Jenny is in the coffee shop and drinking coffee. 4. Being in the coffee shop, Jenny is drinking coffee. 5. In the coffee shop, Jenny is

101. falcon

the average score for a business examination comprising 300 students is 54%. if the marks are normally distributed with a standard deviation of 8%, determine the number of students scores above 70%

102. Prealgebra

An 8-ounce glass of orange juice contains 72 milligrams of vitamin C. How much juice contains 36 milligrams of vitamin C?

103. Math

A number has 6 in the hundredths place. The number also contains a digit whose value is 1/10 the value of 6 in the hundredths place.

104. math

Y=Ax^2+Bx has agradient of 7 at the point (6,8) ,find the constant numbers of A and B ? *calculus*

105. calculus

If F(x) = f(xf(xf(x))), where f(1) = 4, f(4) = 6, f '(1) = 4, f '(4) = 5, and f '(6) = 6, find F '(1).