# Questions Asked onMarch 19, 2012

1. ## Chemistry

Consider the following cell: Pt|H2(g, 0.460 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.00 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion

2. ## chemistry

A 32.2 g iron rod, initially at 22.3 C, is submerged into an unknown mass of water at 63.9 C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.6 C. What is the mass of the water?

3. ## consumer math

I really need help please Your primary job’s gross income is \$3,500.00/month, and your second job’s realized income is \$368.49/month. Deductions are FICA (7.65%), federal tax withholding (10.75%), and state tax withholding (8.35%). How much is the

4. ## Geometry

11-1 Lines that Intersect Circles 8. The International Space Station orbits Earth at an altitude of 240 miles. What is the distance from the space station to Earth's horizon to the nearest mile?

6. ## AP CHEMISTRY

A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS? B) For which of the following processes does the entropy of the system increase? (Select all that apply.) -> alignment of iron filings in a magnetic field

7. ## Chemistry

Consider the following thermochemical equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover: C3C6O + 4 O2 --> 3 CO2 + 3H2O DELTA Hrxm= -1790kJ If a bottle of nail polish remover contains 183 mL of acetone, how much heat

8. ## physics

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

9. ## Chem!!!:/

Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain. A). Hg2Br2 B). Mg(OH)2 C). CaCO3 D). AgI I think acid, neutral,acid,neutral ??? Help please!:) thAnks

10. ## Chemistry

a 0.250 mol sample of HX is dissolved in enough water to form 655mL of solution. If the pH of the solution is 3.44, what is the Ka of HX.

11. ## calculus

The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100-gram sample of the radioactive

how do you find the height of an area of 245 square inches and a base of 14 inches.

13. ## chemistry

water has one of the largest specific heats of any substance. why is it important for human body?

14. ## Pre-Calculus

Find all solutions to the equation in the interval [0, 2pi) cos4x-cos2x=0 So,this is what i've done so far: cos4x-cos2x=0 cos2(2x)-cos2x (2cos^2(2x)-1)-(2cos^2(x)-1) No idea what to do next.

15. ## Physics

Two blocks are connected by a light string that passes over a frictionless pulley as in the figure below. The system is released from rest while m2 is on the floor and m1 is a distance h above the floor. (a) Assuming m1 > m2, find an expression for the

16. ## Chemistry

Please help me get started, i'm not asking for the answer, just some help! A gas occupies 340mL at 273 K and 610 torr. What final temperature would be required to increase the pressure to 1 atm, the volume being held constant?

17. ## chemistry

In the 1970s, when lead was widely used in "ethyl" gasoline, the blood level of the average American contained 0.25 ppm lead. The danger level of lead poisoning is 0.80 ppm. (a) What percent of the average person was lead? (b) How much lead would be in an

18. ## Organic Chemistry

Why would the presence of crystals of sample at the starting line cause streaking on a TLC plate?

19. ## Statistics

John runs a computer software store. Yesterday he counted 127 people whwo walked by his store, 58 of whom came into the store. OF the 58, only 25 bought something in the store. A. What is probability that a person who walks by the store will enter the

20. ## Economics

Consider an economy with a constant nominal money supply, a constant level of real output Y = 100, and a constant real interest rate, r = 0.10. Suppose that the income elasticity of demand is 0.5 and the interest elasticity of money demand is –0.1. By

21. ## chemistry

A dynamic equilibrium, Ag2CO3(s) 2Ag+(ag) , CO3 2- (ag), what affect does the addition af HCl have on the system? Does it cause a shift?

22. ## statistics

A sample of 352 subscribers to Wired magazine shows the mean time spent using the Internet is 13.4 hours per week, with a sample standard deviation of 6.8 hours. Find the 95 percent confidence interval for the mean time Wired subscribers spend on the

23. ## English

for the story the street of the Canon.. -how does pepe gonzalez behave when he first arrives in the village the night of the party? -What might Gonzalez's actions suggest about the kind of person he is? -How does Gonzalez arrange to dance with Sarita?

24. ## AP CHEMISTRY

write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s) NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: Please help me find B

25. ## Geometry

11-1 Lines that Intersect Circles 15. Olympus Mons's peak rises 25 kilometers above the surface of the planet Mars. The diameter of Mars is approximately 6,794 kilometers. What is the distance from the peak of Olympus Mons to the horizon to the nearest

26. ## physics

A 4.00-m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.500 m and mass 1.00 kg. The spool is mounted on a frictionless axle and is initially at rest. The cord is pulled from the spool with a constant acceleration of

27. ## Momentum Physics

The fastest helicopter, the Westland Lynx, has a mass of 3.343 x 103 kg and a maximum momentum of 3.723 x 105 kg.m/s. What is its top speed?

28. ## Math

Why is it important to line up the fraction strips on the left?

29. ## Chemistry

Charcoal is primarily carbon. Determine the mass of CO_2 produced by burning enough carbon (in the form of charcoal) to produce 510 kJ of heat. C + O2 --> CO2 Delta H = -393.5 kJ

30. ## physics!!!

The index of refraction for crown glass is 1.512 at a wavelength of 660 nm (red), whereas its index of refraction is 1.530 at a wavelength of 410 nm (violet). If both wavelengths are incident on a slab of crown glass at the same angle of incidence, 1.1°,

31. ## physics

A dog sits 2.1 m from the center of a merry-go-round. If the dog undergoes a 1.4 m/s2 centripetal acceleration, what is the angular speed of the merry-go-round?

32. ## chemistry

In a .25 M solution, a weak acid is 3.0% dissociated. A. calculate the pH of the solution B. calculate the Ka of the acid Please explain steps.

how do you find the height of a parallelogram with an area of 224 square meters and a base of 16 meters.

34. ## Derrick

John kept track of all his math and reading test scores throughout the year as shown in the table below. Test 1:90math 80reading Test 2:75math 90reading Test 3:80math 70reading Test 4:90math 75reading Test 5:95math 90reading What is the difference between

35. ## trig

What would be the force required to push a 100-pound object along a ramp that is inclined 10 degrees with the horizontal?

36. ## statistics

Suppose that, for students who are enrolled in college algebra, 73 percent are freshmen, 48 percent are female, and 31 percent are female and are freshmen. Your answers below should be entered as decimals and rounded to three decimal places. Two students

37. ## chemistry

Ammonia, NH3, can be made by reacting nitrogen with hydrogen. N2 + 3H2 = 2NH3 How many moles of NH3 can be made if 7.5 moles of H2 react with enough N2? Please help!

38. ## M1, Mechanics

A particle of mass 4kg is suspended from a point A on a vertical wall by means of a light inextensible string of length 130cm.A horizontal force P, is applied to the particle so that it is held in equilibrium a distance of 50cm from the wall. Find the

39. ## Algebra (maths)

Please help: The length of a rectangle is 5m greater than twice its width, and its area is 33m^2 (the m is squared). Find the dimensions.

40. ## physics

A girl ties a toy airplane to the end of a string and swings it around her head. The plane's average angular speed is 2.2 rad/s. In what time interval will the plane move through an angular displacement of 3.3 rad?

41. ## Math

The population of humorville is 8,500 people. In this town, jokes travel fast. In one hour, each person who hears a joke tells three other people who have not heard it, and tells no one else. Last Friday, a visitor from out of town told the police chief a

42. ## Precalculus

Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k

43. ## physics

A beetle sits at the top of a bicycle wheel and flies away just before it would be squashed. Assuming that the wheel turns clockwise, the beetle's angular displacement is 3.14 radians, which corresponds to an arc length of 1.2 m. What is the wheel's

44. ## trigonometry

three circles of radie 3,4, and 5 units respectively are tangent to each other eternaly. find the angle of the triangle formed by joining centers? help plz

45. ## Math

Evaluate the expression below log 243 9

46. ## STATISTICS

Suppose that, for students who are enrolled in college algebra, 78 percent are freshmen, 40 percent are female, and 28 percent are female and are freshmen. Your answers below should be entered as decimals and rounded to three decimal places. (a) One

47. ## physics

The sum of two forces, one having a magni- tude of 2 N acting due west and other having a magnitude of 8 N acting due north is?

48. ## Accounting

Which of the following is not a "trade or business" expense? A. Mortgage interest on a warehouse b. Mortgage interest on a personal residence c. Cost of goods sold is it B

49. ## physics

A supertanker filled with oil has a total mass of 14.1·10^8 kg. If the dimensions of the ship are those of a rectangular box 271 m long, 93.1 m wide, and 93.1 m high, determine how far the bottom of the ship is below sea level (ρsea = 1020 kg/m^3).

50. ## Chemistry

Dinitrogen tetroxide decomposes according to N2O4 (g) = 2NO2 (g) In a certain experiment, N2O4(g) at an initial pressure of 0.554 bar is introduced into an empty reaction container; after equilibrium is established, the total pressure is 0.770 bar. A

51. ## Physics

An archer shoots an arrow into a piece of wood. The arrow is traveling at 120 km/h when it strikes the wood. The arrow penetrates 3.8 cm into the wood before stopping. What is its average acceleration (in m/s2) into the wood?

52. ## physics

What amount of heat is required to increase the temperature of 75.0 grams of gold from 150°C to 250°C? The specific heat of gold is 0.13 J/g°C.

53. ## calculus

An open rectangular box having a volume of 256 is to be constructed from a tin sheet. Find the dimensions of such a box if the amount of material used in its construction is to be minimal. Hint: Let the dimensions of the box be x by y by z . Then, xyz=256

which of the following would translate a segment 5 units to the left and 8 units up? a)-5 -5 and 8 8, b) -2 -4, c) -5 8 and d) -5 8, -2 -4 which of the following translations corresponds to the matrix { 2 2 2} { -3 -3 -3} a) a segment is shifted 2 units

55. ## physics

An athlete spins in a circle before releasing a discus with a tangential speed of 9.0 m/s. If his angular speed at the moment of release was 12.0 rad/s, how far was the discus from his axis of rotation?

56. ## physics!!!

A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 45.0°. The index of refraction of quartz is 1.455 at 660 nm (red light), and its index of refraction is 1.468 at 410 nm (violet light). Find the

57. ## english

F. Scott Fitzgerald dropped out of college to

58. ## Chemistry

Which of the following would you add to a mixture of CaCO3(s) and its saturated solution to increase the molar solubility of CaCO3: more water, Na2CO3, NaOH, NaHSO4? Explain.

59. ## chemistry

a 256 mL sample of an unknown gas was collected over water at 23 degrre celsius and 750 mmHg. the gas has a mass of 0.80 grams. what is the molar mass of the gas? (the vapor pressure of water at 23 degree celsius is 21.0 mmHg)

60. ## English,maths,physics,chemistry

Topic:machine,a block and tackle of 6 pulleys is used to raise a load of 300N steadily through a height of 30m.if the work done against friction is 2000J. calculate:the work done by effort,the efficiency of the system,the applied effort.

61. ## Finite Math

A pair of dice is cast. What is the probability that the sum of the numbers landing upwards is 8 if it is known that the two numbers are different?

62. ## Chemistry

Ok ive been working on this problem for hours now, can you please tell me if i am correct? Thank You! A gas occupies 340mL at 273 K and 610 torr. What final temperature would be required to increase the pressure to 1 atm, the volume being held constant?

63. ## Geometry

If DE = 4x+5 and GJ = 3x+25 what is DE? DE is the midpoint of the triangle.

64. ## CHEMISTRY

Rank the following complex ions in order of increasing wavelength of light absorbed. (Use the appropriate symbol to separate substances in the list.) Co(H2O)63+, Co(CN)63-, CoI63-, Co(en)33+

65. ## biology

Traits like human height and skin color shows a wide range of phenotypes, as opposed to just two ot three. From the standpoints of genese and alleles, explain why is this so.

66. ## principles of physics

Blood pressure is normally greater in your ____________________. A) arms.B) legs.C) head.D) feet.E) All the same

67. ## Geometry

Find the area of the regular polygon with the given radius. Radius: 6cm. Area= apothem x perimeter/ 2

68. ## physics

An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m and opens the parachute at an altitude of 195 m. (a) Assuming that the total retarding force on the diver is constant at 55.0 N with the parachute closed and constant at 3 600 N with the

69. ## Math

Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help

70. ## English

1. What is his personality like? 2. What is his personality? 3. He is generous. (Which question is correct?)

71. ## Geometry

Find the area of the regular polygon with the given radius. The radius of the square is 6 cm. area= apothem x perimeter/ 2

how do you find the height of a triangle with an area of 245 square inches and a base of 14 inches.

73. ## Accounting

On July 15, 2009, Travis purchased some office furniture for \$20,000 to be used in his business. He did not elect to expense the equipment under §179 or bonus. On December 15, 2011, he sells the equipment. What is his cost recovery deduction for 2011? A.

74. ## math

Caleb planted a garden in a rectangular shape. The garden is 6 feet and 14 feet long. How many rows, 18 inches apart, did he plant lengthwise?

75. ## physics

An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m and opens the parachute at an altitude of 195 m. (a) Assuming that the total retarding force on the diver is constant at 55.0 N with the parachute closed and constant at 3 600 N with the

76. ## Psy

I have read my reading materials and answered to the best of my understanding. If anyone could help I would appreciate it! Comparing Systems of Abnormality Psychologists use several different models to explain abnormal behavior. These different models have

77. ## chemistry

ph at equivalence point when 25 ml of a 0.175M solution of acetic acid is titrated with 0.10M of NaOH at its end point

78. ## math

A four-digit number is selected at random. What is the probability that its ones place is greater than its tens place, its tens place is greater than its hundreds place, and its hundreds place is greater than its thousands place? Note that the first digit

79. ## AP CHEMISTRY

I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s) NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium

80. ## calulus

The top and bottom margins of a poster are 8 cm and the side margins are each 6 cm. If the area of printed material on the poster is fixed at 380 square centimeters, find the dimensions of the poster with the smallest area. find the width and height

81. ## college physics

An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m and opens the parachute at an altitude of 195 m. (a) Assuming that the total retarding force on the diver is constant at 55.0 N with the parachute closed and constant at 3 600 N with the

82. ## physics

Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help

83. ## math

How could you use the product of 1/5x 40 to find the product of 4/5 x 40?

84. ## math

james reads at a rate of 4 pages every 6 minutes. how long will it take him to read 32 pages if he reads at the same rate?

85. ## math for elementary teachers

Suppose that carpeting cost \$12.36 per square yard at a carpet store. what will be the cost to carpet a conference room if the rooms dimensions are 110 ft by 42 ft. (the conference room should seat 380 people using 6' diameter tables each seating 10

86. ## Physics

The fastest helicopter, the Westland Lynx, has a mass of 3.343 x 103 kg and a maximum momentum of 3.723 x 105 kg.m/s. What is its top speed?

87. ## chemistry

If 0.0418 grams of Mg are reacted with excess HCl, how many moles of hydrogen gas will be formed?

how do you work out this problem, find the height of a parallelogram with an area of 224 square meters and a base of 16 meters.show work please thank you

89. ## Accounting

On May 26, 2007, Jamal purchased machinery for \$30,000 to be used in his business. He did not elect to expense the equipment under §179 or the bonus. On October 10, 2011, he sells the machinery to a scrap metal dealer. What is his cost recovery deduction

90. ## Algebra

rectangular prism with base perimeter 30 cm, base area 50 cm^2, and height 150 cm. Choices are: A. 7,560 cm^2 B. 4,600 cm^2 C. 1,800 cm^2 D. 4,550 cm^2

91. ## Physics

A 83-kg fisherman in a 122-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.7 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the

92. ## AP CHEMISTRY

I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s) NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium

93. ## computer programming

Problem 7. Design an algorithm that will produce a savings account balance report from a customer savings account file. Each input savings account record contains the account number, balance forward, deposits (sum of all deposits) , withdrawals (sum of all

94. ## Chemistry

amount of heat generated by the combustion of 245 g of CH3OH in 2CH3OH(l)+3O2(g)=2CO2+4H2O(l)

95. ## Math

Mrs. Garcia's class is making a banner to hang in the school's display case. They started by sewing 7/8 of a yard of gold fabric at the top, 5/8 of a yard of black fabric in the center, and 7/8 of a yard of red fabric on the bottom of the banner. How many

96. ## Early Education

The single most important factor in determining the quality of an educational program is the: A. talk to parents/guardians about their child's behavior. B. ask other teachers about their observations of the child. C. compare the child to other children in

97. ## spanish

Using verbs ser & estar how do I answer these question. 1. Donde esta Ecuador? Esa en America del Sur 2.Donde esta Mexico? Esta en America del Norte 3. Que e un parque? Es un lgar conarboles, planas y es usado por las familias para divertirse.

98. ## Grammar/Morphemes

In the word ecologists, is eco the root morpheme or ology? Are the morphemes eco, log, y, ist, s or ec, ology, ist, s ? This is very confusing for me. Any explanation on how to find the root would be appreciated. It's easy to find roots on some words, but

99. ## calculus

Consider the function f (x)=x1=5(x��4). This function has two critical numbers A < B Find A and B For each of the following intervals, tell whether f (x) is increasing (type in INC) or decreasing (type in DEC). (-inf;A]: [A;B]: [B;inf) The

100. ## Physics

A 0.31-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 5.6 m. (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone

101. ## theoretical optics

A man 1.5meter tall stands in front of a concave mirror whose radius is 30cm. Find the position of the man that will lead to his image on the screen 20 cm. from the mirror. How big is the man's image?

102. ## algebra

Write the slope intercept equation for the line that passes through (14,-2) and is perpendicular to 7x-10y=18.Please show work.

103. ## physics

super sam intends to jump off a 100 foot tower with an elastic cord tied to one ankle, ad the other end tied to the top of the tower. This cord is very light but very strong and stretches so that it can stop him without pulling his leg off. Such a cord

104. ## BLD 414

A liquid solution of formaldehyde is 37.0% pure. This solution has a specific gravity of 1.037. The molecular weight of formaldehyde is 30.0. to 1.00 ml of this impure stock solution is added quantity sufficient to take the total volume to 500ml. If 1.00

105. ## Chemistry

Another Equilibrium Question! The following reaction is at equilibrium in a closed 20.0-L container. At equilibrium, the pressures of NH3 and HCl are both equal to 0.00552 atm, and the mass of NH4Cl (s) is 35.4 g. Calculate the equilibrium pressure of NH3

106. ## geometry

Determine the name of the quadrilateral that fits the given property. Only one pair of opposite sides is parallel. This quadrilateral is a _________. A. kite B. rectangle C. rhombus D. square E. trapezoid

107. ## physics

A 6.5 g bullet leaves the muzzle of a rifle with a speed of 347 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.83 m long barrel of the rifle?

108. ## Chemistry

Hi, Please provide assistance on the following problem. I worked out part of it, but do not know what to do after calculating pH for HCl. Suppose you dissolved 0.0365 grams of HCl in water to give a final volume of 10.0 mL. The molar mass of HCl is 36.5

Which sentence best shows a point of view about population growth? A. His new book, TOo many?, is about our planet's growing population B.And the population just keeps growing C.With all those people out there, humans have the ability to do more than ever

110. ## Social Studies

The Surpreme Court ruled that slaves were not citizens of the U.S. and had no rights. Answer:Dred Scott decision The number of slave states and free states was kept balanced when Missouri was allowed into the Untion as a slave state and Maine as a free

111. ## chemistry

i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

112. ## Algebra

triangular prism with base perimeter 24 cm, base area 24 cm^2, and height 15 cm. Choices are: A. 606 cm^2 B. 384 cm^2 C. 408 cm^2 D. 87 cm^2

113. ## MATH FOR TEACHERS

the roof is a right rectangular prism and the floor is a rectangle. (its the outside of a warehouse). for the roof- the base has 51 x 51. The rectangular for the floor is 120 (l) x 20 (h) x 90 (w). need to find the volume and surface area. (counting the

I need help with the question below. A bicyle tire has a diameter of 24 inches. If a tire rotates for 20 revolutions about how far has the bike rider ridden? Use 3.14 for pi. I know to find the circumference you would do 24 x 3.14 which equal 75.36. I'm

115. ## FINITE MATH

Applicants who wish to be admitted to a certain professional skill at a large university are required to take a screening test that was devised by an educational testing service. From the past results, the testing service has estimated that 70% of all

116. ## american history

Sir George Grenville, King George's Chancellor of the Exchequer, enacted the Revenue Act of 1764 to raise revenue for maintenance of the British Army in America. In the colonies, it was commonly known as the _______ Act.

117. ## Accounting

On November 30, 2011, Constance purchased an apartment building for \$750,000. Determine her cost recovery deduction for 2011 rounded to the nearest dollar? A. \$0 B. \$2,400 C. \$3,413 is it B

118. ## algebra

QRST is a parallelogram.Find v

119. ## chemistry

A solution is saturated with Ag2CrO4. a) Calculate [CrO4^2-] in this saturated solution. b) What mass of AgNO3 must be added to 0.635 L of the solution to reduce [CrO4^2-] to 1.0* 10^-8M?

120. ## Math

The table shows the times a train left Austin and arrived in San Antonio on 5 nights last week. Mon 6:30pm left 7:22pm arrived Tues 6:18pm left 7:10pm arrived Wed 6:45pm left 7:37pm arrived Thu 7:05pm left 7:57pm arrived Fri 6:28pm left 7:20pm arrived What

122. ## Physics

In Fig. 25-37, V = 12 V, C1 = 9.8 µF, and C2 = C3 = 18 µF. Switch S is first thrown to the left side until capacitor 1 reaches equilibrium. Then the switch is thrown to the right. When equilibrium is again reached, how much charge in Coulombs is on

123. ## English / need advice

we are asked to write a 1 page report about how is fermented beverage made. my plan is to make report about fermented milk. i found this article but my concern is how can i make my report without looking like a copy/ paste work? need serious advice. here

124. ## Geometry

Find the area of the regular polygon with the given radius. The radius of the square is 6 cm. area= apothem x perimeter/ 2

125. ## Math

Round to the nearest Ten-Thousands. 1) 1.771243749 2) 1.516522298 3) 1.343695405 4) 1.127224043 5) 1.032211555

126. ## theoretical optics

Whereb must an object be placed from a concave mirror of radius of curvature of 6cm. to give an image on a screen four times as large as the object

127. ## Gen. Chem 1

The density of 18% nh4cl is 1.05 grams/ml. What mass of nh4cl is in 425 ml of the solution?

1 The mass of the magnesium metal when performing the calculation of the ideal gas constant experiment... After all measurements have been taken and the stopper is removed from the eudiometer, the liquid in the beaker can be

129. ## math

Solve for x in the following equations. (4 marks) log3(x - 5) + log3(x + 3) = 2

130. ## English

Hello. I'll be very grateful if you help me understand the word "thrusting" used in the context: "she can be distinguished from the pop world's thrusting teens." Does "thrusting" mean 1)go-ahead,active or, maybe, 2)obtusive,importunate or maybe something

I'm having trouble with this question....Eli kept a record of how many baskets each team member made in 10 tries. Which is the BEST data display for Eli to use to show this data? I know it is not a circle graph or a line plot. I have it narrowed down to

132. ## math

a ball is dropped from as balcony 700 feet above the ground. How long does it take to hit the ground?

133. ## math

1/3 of the 84 students were assigned to each room.hoe many students were assigned to each room? Explain your answer

134. ## Chemistry

Why doesn't water undergo electrolysis? Why does Na2SO4 undergo electrolysis?

135. ## algebra

Which situation would most likely be represented by a negative correlation: hours of practice and your golf score, hours of practice and the number of baskets you make in basketball, or hours of practice and the cost of a computer? Hint: In golf, the lower

136. ## physics

Which of the following 1-gram blobs of water has the least surface area? A) All have about the same surface area.B) A spherical blob.C) A blob stretched into a thin film.D) A pancake shaped blob.E) An ellipsoid-shaped blob.

137. ## Math/Economics

If one kilogram of flour costs \$2 in Canada, and 100 shillings in Kenya, what would Purchasing Power Parity predict the Kenyan shilling to be worth in Canadian dollars?

1. Which one of the following is not a benefit to the employer when offering an ESOP? (Points : 1) maintains a stable work force owner can sell stock to a friend results in a dilution of value of the stock ESOT can borrow money under favorable conditions

139. ## Physics

An object has a kinetic energy of 244 J and a momentum of magnitude 24.9 kg · m/s. (a) Find the speed of the object. (b) Find the mass of the object.

The diagram shows a cylinder of mass 20 kg lying at rest on two smooth planes inclined at angles of 40 degree and 50 degree to the horizontal. Calculate the reaction force exerted by the planes on the cylinder. For digram, please click the following link

141. ## xeco/212

I am having a horrible time coming up with an example of the "law of supply." Any suggestions would be helpful.

142. ## AP CHEMISTRY

i added info in the last question in AP CHEMISTRY

143. ## calculus

Let f (x) =7x-5/x+3 . Find the open intervals on which f is concave up (down). Then determine the xcoordinates of all inflection points of f . 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection points occur at x =

144. ## Chemistry

An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M

145. ## math

Find the future value of an annuity if you invest \$1,550 annually for 5 years at 11.5% compounded annually.

146. ## english

In the article, "How Lethal Was the K-T Impact?" by Richard A. Kerr and Virginia Morell, what is listed as part of the related subject matter?

147. ## math

To get a C in physics, a student must score an average of 70 on four tests. Scores on the first three tests were 63, 85, and 82. What is the lowest score the student can make on the last test and still get a C?

148. ## Math Finite

Experiment: roll a fair die and flip a fair coin. What is the probability is that you roll a 3 and flip a head?

149. ## Books

are Dean Koontz books appropriate for 12 year olds?- even if he/she is an advanced reader that read college book?

150. ## Grammar

Need a little bit of help here. 1. Select the correct verb form: A) The box of medical books was heavy. B) The box of medical books were heavy. 2. _____are going to dinner together. A) Me and my boss B) My boss and I 3. Select the sentence which is

151. ## world history germany

how did ww2 led to the postwar government of germany? what was the post war government?

152. ## statistics

An expert witness in a case of alleged racial discrimination in a state university school of nursing introduced a regression of the determinants of Salary of each professor for each year during an 8-year period (n = 423) with the following results, with

153. ## sewing

Which type of fasteners becomes more secure when yu try to pull the garment pieces apart a)snap fasteners b)hook fasteners c)velcro d)zipper

154. ## math

a survey was taken at the park. Children were asked how many times they had visited the park this year. Find the range, mode, and median of the data to the right. trips to the Park ----------------------- number of number of visits visitors 3 ///// 4 /// 5

155. ## physics momentum

A 485 kg boxcar traveling at 23 m/s strikes a second car (initially at rest). The cars couple, and move off at 9 m/s. What is the mass of the second car?

156. ## calculus

Let f (x) = x3 ��3x2 +5x+2. Find the open intervals on which f is concave up (down). Then determine the x-coordinates of all inflection points of f . 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection

157. ## chemistry

if the rate of a reaction doubled with temperature increase from 30 to 40 degrees celcius, what is the activation energy

158. ## math

Find the slope of the secant to the curve f(x) = -2logx + 3 between: (1 each) i) x = 1 and x = 2 ii) x = 1 and x = 1.5 iii) x = 1 and x = 1.1 vi) x = 1 and x = 1.01 b) Extend the result from part a to determine the slope of the tangent to the curve at x =

159. ## trig

howard and keight who are 2km apart are on a horizontal plane observe a balloon in the same vertical plane with themselves the angles of elevation are 50 degrees and 65 degrees respectively find the height of the balloon. A.if its situated between howard

162. ## Financial Accounting

Is Depreciation expense recorded in the General Journal?

163. ## Geometry

Solve. 2x^2 = 8x

164. ## statistics

(a) Plot the data on lightning deaths. (b) Describe the trend (if any) and discuss possible causes. (c) Fit an exponential trend to the data. Interpret the fitted equation. (d) Make a forecast for 2005, using a trend model of your choice (or a judgment

165. ## vehicle speed

The radius of curvature of the path for a passenger car is 9.2m. The mass of the vehicle is 1,483kg. The coefficient of friction is 0.76 and the normal reactionary force for a tyre is 41kN. What is the maximum speed (in terms of km/h) of the car for

166. ## Italy

What are some famous restaurants and hotels in Italy? Could you tell me more about their history?

167. ## Math

Simplify using the exponent law. Express your answer using positive exponents only. [4x^1/3]^1/2 [9x]^-3/2 / [27x]^-1/3

168. ## calculus

Let f (x) = x^2 + 5x-14. Find the open intervals on which f is concave up (down). Then determine the xcoordinates of all inflection points of f 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection points occur at x

169. ## chemistry

5.00 grams of hydrogen is found to diffuse through an opening in 20.00 minutes. under the same conditions, how many grams of carbon monoxide would diffuse through the same opening in 20.00 minutes of time?

170. ## History, Social Studies

People had known how to make steel since ancient times, but many historians claim steel caused a second industrial revolution at the end of the nineteenth century. Name the two innovators and the innovations in the production of steel that triggered the

171. ## biology

Why are seeds considered a more effective means of reproduction than spores in a dry environment?

172. ## physical

what is use of physicaleducation

173. ## arithmetic

Please complete the following sequence so that, after the first two terms, each successive term is the average of all the preceeding terms. 20__ __ 28 __ __

174. ## Maths

Square root of 12 using prime factor form? Square root of 320 using prime factor form? Square root of 36 using prime factor form?

175. ## trigonometry

howard and keight who are 2km apart are on a horizontal plane observe a balloon in the same vertical plane with themselves the angles of elevation are 50 degrees and 65 degrees respectively find the height of the balloon. A.if its situated between howard

176. ## algebra2

(4/y^2-1/y^3)/(2/y+3/y^2) Simplify. Leave answers in factored and reduced form. Put () around the polynomials on numerator and denominator.

177. ## chemistry

i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

178. ## physics

What is a tire's angular acceleration if the tangential acceleration at a radius of 0.15 m is 9.4 x 10-2 m/s2?

179. ## math,

alexander jogs 4 miles every 30 minutes if he jogs at this rate how long will it take him to jog a total distance of 24 miles?

180. ## math

Templeton Extended Care Facilities, Inc. is considering the acquisition of a chain of cemeteries for \$360 million. Since the primary asset of this business is real estate, Templeton's management has determined that they will be able to borrow the majority

181. ## math

a survey was taken at the park. Children were asked how many times they had visited the park this year. find the range, mode, median of the data to the right.

182. ## chemistry

A new antibiotic drug has been developed for human oral administration. TECHNICAL DATA FOR ANTIBIOTIC AS FOLLOWS; pKa = 2.1; pH = 2.0 (stomach); pH = 6 (intestines) Will the drug dissociate in aqueous solutions as a weak or strong acid? Explain

183. ## math

Justice wants to invest in a mutual fund for her retireme. If she expects to make 17% annually and wants to retire in 35 years, how much money must she invest per month to have 5 million dollars when she retires?

184. ## math

a) Log2(x^2 – 9/x^3)^3

185. ## algebra

Write a slope intercept equation for the line that passes through (2,-7) and (4,-13) Please show work,

186. ## algebra

Write the slope-intercept form of the equation of the line.Please show work. Show in graph.(-3,-5)(6,1)

187. ## statistics

Show the work for 750 x 23%, how do you do it?

189. ## data managment

corey's mother randomly placed four blocks labelled c, o , r ,e and y on a shelf. the probability that she placed them on a shelf so they spell corey is what?

190. ## physics

Which floats with most of its volume below the surface? A) None of these.B) An oak log.C) All of these.D) An iceberg.E) A mountain range.

191. ## math

integreal 3cot^2 4xdx

192. ## statistics

writing to explain. the median score on a test is 90. is it possible to add two more scores to the data and still have a median score of 90? explain ypur answer

193. ## Physics- Projectile motion

Hi guys, Im not one to ask for help but i missed ALOT of school because I got sick and I was wondering if anyone could solve three problems for me and help me out! Thanks in advance ! Problem 1- A plane is dropping a supply of coconuts to survivors of the

194. ## spelling

can you give me a sentence for each of these words? conflict,orphan,instant,complex,simply,burglar,laundry,and laughter.

195. ## Biostatistics

Why are the results of an independent samples test different from the results of a Tukey HSD test on the same data?

196. ## math

Consider what happens if you modify your function to the form y=Ax^n (from y=X^n) what is the effect of changing the value of A on the area formula? Can you justify why this should be the case? (from culculating curvy area)

197. ## chemistry

pKa = 2.1; pH = 2.0 (stomach); pH = 6 (intestines) = 99.98741233 % ionized in intestines = 0.012587669 % non-ionized in = 55.7311634 % non -ionized in stomach =44.2688366% ionized in stomach Predict whether this compound will be absorbed by passive

198. ## Chemistry

My teacher gave us the answer to a chemistry problem and i cannot figure out how she got the answer. Can you help me work out this problem so i can better understand it. A gas under an initial pressure of 0.60atm is compressed at a constant temperature

199. ## geometry

I don't get this and I need help please. Find the circumference of a circle circumscribed about a square with perimeter 48 ft. ______________ft. (Round to the nearest 0.1 ft.)

200. ## Chemistry

Why doesn't water undergo electrolysis? Why does Na2SO4 undergo electrolysis?

201. ## statistics

if the class limit is 11-20 and the class boundary is 10.5-20.5,what is the class width?

202. ## Math

A product costs k100,90% of the price being production cost,the remainder being tax.if the government raises the tax by 50%,by how much in % will the factory have to reduce its production cost,to keep the price still at k100? A.5 B.85/90 C.50/9 D.85/15

203. ## English

Writeacher, I'm glad you are with us again. I'm finding it difficult to check 2-4. I wonder if you could help me. Thank you 1) The teacher took two points off for each/every (any is a mistake) grammar mistake. Edward got back at his brother for being rude

204. ## calculus

2. An object is moving along the parabola y = 3x^2. a) When it passes through the point (2, 12), its “horizontal” velocity is dx/dt= 3. What dt is its “vertical” velocity at that instant? b)If it travels in such away that dx/dt=3 for all t,then

205. ## english / need proof reading

first of all, i'm an esl student and i'm bad in making research paper. please give me advice on how i can improve. here is my work that needs proof reading. ty Fermentation has been used for many years to produce beverages such as wine. Fermentation in

206. ## Mystery Fiction

What is a good mystery fiction book for adults (college level or adult)?

207. ## Finite Math

A coin is tossed 10 times. What is the probability that at least 8 heads appear?

208. ## Bio-100

I need someone to check my assignment to see if I have the correct answers. What are 10 Characteristics of Living Organisms? 1. Composed of one or more cells 2. May evolve into a new type of organism 3. Carries out and controls a variety of chemical

209. ## accounting

how is accounting information in financial statement confusing?

210. ## physics

locks A, B, C are placed in the adjacent figure and connected by ropes of neglible mass. Both A and B weigh w = 25.0 N each and the coefficient of kinetic friction between each block and the surface is 0.35. A) If Block C descends with constant velocity

211. ## Geometry

Solve. y-4 = 3/4y

212. ## principles of physics

For which of these will the buoyant force be the same as its weight when placed in water? A) A match stick.B) All of these.C) A small rock.D) None of these.E) A nail.

213. ## algebra

how do i solve 10x+10 over 3x-6 divided by 2x+2 over 3xy-6y

214. ## dressmaking

the top of pants or skirt is finished with facing when a)extra strength is required at the waistline 2)its not possible to layer the fabric 3)a stay tape cant be used at the seams or 4)you don't want the waistband to be visible from the right side

215. ## math

a survey was taken at the park. Children were asked how many times they had visited the park this year. find the range, mode, median of the data to the right. trips to the park. number of visits 3 4 5 6

216. ## Math

Carlos counted all of the tickets that were taken at a school carnival. Each time he counted 10 tickets, he placed a tally on the chart below. Adult 16 Child 18 Which number sentence could be used to find t, the total number of tickets he counted?

217. ## chemistry

Fill in the missing value for V. P=1.2 atm, n-5.00 and T= 300.15 K....how do I set up the PV=nRT or do I solve in a different way?

218. ## English

Can someone check these two paragraphs, please? It is really important to me. 1)In Chapter ten Dr Jekyll comes to the realization of the primitive duality of man. He admits that man is not truly one but two. He is sure that if he can separate his two

219. ## precalc!!!!!

I have to prove this: (a^3-b^3)= (a-b)(a^2+ab+b^2) How do I use long division to get (a^2+ab+b^2). I'm given..... 1). (a^3-b^3)/ (a-b) I cant get that answer. Help?

220. ## science

Why do you think the watershed approach to addressing nonpoint source pollution is useful?

221. ## math

Max has 7 blue marbles,4 green marbles,and 3 yellow marbles in a bag. what is the probiblity of Max pulling out a yellow marble.

222. ## 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?

223. ## english

the question might sound dumb, but can anyone check to see if the sentence is correct: It's(form) due till May 1st.

224. ## Chemistry

An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M

225. ## biology

do reduced or oxidized forms of carbon carry more energy?

226. ## math

Determine the value of each of the following logarithmic expressions. Do not change bases. A) log8 4

227. ## RES/341

Why should you use both primary and secondary data in research?

228. ## English

As Writeacher is on holiday, I need someone of you, Ms Sue, to check my paragraph. In particular, sentence 1 (?) "he had daydreamed" and sentence 2 (the whole sentence). I really hope you can help me. 1)In Chapter ten Dr Jekyll comes to the realization of

229. ## algebra

Write a slope intercept equation for the line with the slope-1/4 and y-intercept (0,-2)and graph the line.Please show work.

230. ## math

Ross ran a mile in 6.28 minutes to win a race.Don finished second with a time of 6.55 minutes.How much faster was Ross than Don?

231. ## math

Ross ran a mile in 6.28 minutes to win a race.Don finished second with a time of 6.55 minutes.How much faster was Ross than Don?

232. ## physics

A leather ball of circumference 75.9 m and mass 557 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, it rises at a constant velocity. a) Calculate the buoyant force on the ball. b) Calculate the drag

233. ## English

Thank you very much. A few other things on sentences I need to check. They are really awkward to check. 1) Which of the following are possible? The novels were told/written in the first or third person singular (?). We have a first or third person

234. ## geometry

the base of a 34ft ladder is placed 12ft from a building. how high above the ground is the top of the ladder

235. ## social study

what concerns did Ameriacns living in california have about the mexican government in the 1840's?

236. ## word problems in algebra

the hours or min in 345 seconds how do I construct the equation and solve

237. ## physics

How long, in seconds, is required for a car traveling at a speed of 32 km/hr to travel 110 m?

238. ## Grammar

1. Select the sentence which is correctly punctuated: A) The patient was seen by Dr. Jones cardiology specialist Dr. Smith rheumatology specialist and Dr. Brown urology specialist. B) The patient was seen by Dr. Jones, cardiology specialist; Dr. Smith,

239. ## trig

if sin theta equals 3/7, what is tan theta?

240. ## science

How does grazing, septic systems and recreational boating contribute to non-point source pollution ?

241. ## Math

How would I solve these problem? 4/x-1 = 10/1 and x/x-8 = x / 24

242. ## chemistry

A certain liquid has vapor pressures of 50 Torr. 1 mol of an involatile solute is dissolved in 1 mol of this liquid. What is the vapor pressure of the liquid above this solution?

243. ## math

Meera arrived at her grandmother's house at 8:00 a.m. First they made cookies. At 10:00 a.m. they played tennis. At 12:30 p.m. they mde sandwiches. At 12:45 they ate the sandwiches and the cookies. How much time did Meera and her grandmother spend making

244. ## algebra

what is the !@#\$%^&tion for input 3 and output 16?

245. ## bus mgt

For this discussion use the "Critical Thinking Process" document to analyze the problem-solving the individuals may apply in the case study, "Elective Surgery Department Faces Decreased Patient Satisfaction." Share your chosen role and your role's ideas

246. ## math

how can you find the area of a square when you know the length of one side?

247. ## trig

verify that 2/1+cos theta - tan squared (theta/2) = 1

248. ## science

what is bouyancy?

249. ## Algebra 2

Factor 12^2-3

250. ## 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?