# todd

Popular questions and responses by todd
1. ## chemistry

How many kilojoules are required to melt 15g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?

asked on September 19, 2016
2. ## Physics

I don't completely understand what this question is asking: Three people are standing on a horizontally rotating platform in an amusement park. One person is almost at the edge, the second one is (3/5)R from the center, and the third is (1/2)R from the

asked on December 15, 2014
3. ## Math

A trash company is designing an​ open-top, rectangular container that will have a volume of 135 ft^3.The cost of making the bottom of the container is​ $5 per square​ foot, and the cost of the sides is​$4 per square foot. Find the dimensions of

asked on October 8, 2016
4. ## statistics

Find the standard deviation, Sigma, for the binomial distribution which has the stated values of n and p. Round your answer to the nearest hundredth. n = 639; p = 0.7

asked on April 14, 2013
5. ## Chem

Identify the conjugate acid-base pairs in the following reactions. (a) NH4+(aq) + OH-(aq) NH3(aq) + H2O(l)

asked on March 6, 2017
6. ## Math

Write 5+7+9+11+13+15+17 in sigma notation.

asked on January 9, 2015
7. ## Chemistry

Comment on the relative acidities of h3po4 and the h2po4 ion? I don't understand what this question is asking? Would H3PO4 is a strong acid and will completely dissociate into ions in aqueous solution suffice?

asked on February 26, 2013
8. ## Maths

Three different numbers have median 2 and range 2. Find the three numbers

asked on May 1, 2017
9. ## math

a new statue with a circular base is being unveiled. The statue's base has a radius of 8 ft. What is the area of the base? Round to the nearest whole number. Use 3.14 for p.

asked on March 11, 2016
10. ## Economics

The demand curve for a monopoly is: 1. the MR curve above the AVC curve. 2.above the MR curve. 3.the MR curve above the horizontal axis. 4. the entire MR curve.

asked on March 30, 2017
11. ## chem

A solution of ammonia and water contains 3.80×1025 water molecules and 5.80×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

asked on January 21, 2015
12. ## Math Question

Find the values of the six trigonometric functions of an angle in standard position where the terminal side is going through the point (-1, 1). Sinθ = Cosθ= Tanθ= Cscθ= Secθ= Cotθ=

asked on December 4, 2014
13. ## Physics

A 95 kg rowboat is initially at rest, until it is pulled toward the dock with a rope with a tension of 30.0 N. The dock is higher than the boat, and the rope makes an angle of 25° at the place where it meets the boat. What is the acceleration of the boat?

asked on October 31, 2011
14. ## Applied statistics for business and economics

Only 0.02% of credit card holders of a company report the loss or theft of their credit cards each month. The company has 15,000 credit cards in the city of Memphis. Use the Poisson probability tables to answer the following questions. What is the

asked on October 24, 2010
15. ## Maths

A tank with 520L of water begins to leak at a rate of 2L per day, At the same time, a second tank is being filled at a rate of 1L per hour, starting at 0L. How long does it take for the tanks to have the same volume?

asked on March 14, 2017

A game is played using one die. There is a$1 charge to play the game. If the die is rolled and shows a five, the player receives$6 back ( a profit of $5 and the original$1). If any other number shows, theplayer loses the original $1. What is the player's asked on July 16, 2011 17. ## Maths Nina, Shanti and Belle run a 1000 m race at a constant speed. When Nina crossed the finish line first, she was 200 m ahead of Shanti and 400 m ahead of Belle. When Shanthi crossed the finish line, how far ahead of Belle was she? asked on July 22, 2017 18. ## ela PLE IVE ME RIGHT ANSWERS I REALLY NEED HELP 2. IN ONOMONIAPEIA WHAT dose the speaker mean to convey with the following lines Splash/splatters/scatters/spurts a. the water is not running b. the water is running regularly c. the water is running slowly d. the water is running irregularly 4. identify asked on February 10, 2017 19. ## math A small plane is flying a banner is 144 square feet. The width of the banner is 1/4 the length of the banner. What are the dimensions of the banner? asked on February 2, 2015 20. ## Statistics/Math- Please Help The company offers two types of sales: 1. Internet sales; 2. Store sales. The marketing research manager believes that the Internet sales are more than 10% higher than store sales. The null hypothesis would be: A. Pinternet–Pstore >.10 B. asked on November 16, 2010 21. ## Statistics/Math- Please Help The company offers two types of sales: 1. Internet sales; 2. Store sales. The marketing research manager believes that the Internet sales are more than 10% higher than store sales. The null hypothesis would be: A. Pinternet–Pstore >.10 B. asked on November 16, 2010 22. ## Physics Fairgoers ride a Ferris wheel with a radius of 5.00 {\rm m} . The wheel completes one revolution every 31.5 s What is the average speed of a rider on this Ferris wheel? If a rider accidentally drops a stuffed animal at the top of the wheel, where does it asked on July 1, 2010 23. ## Math Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the asked on October 24, 2016 24. ## algebra The speed of a passenger train is 16 mph faster than the speed of a freight train. The passenger train travles 300 miles in the same time it takes the freight train to travel 220 miles. find the speed of each train asked on June 22, 2012 25. ## rainwater What would cause rain water puddle to turn black in color asked on June 19, 2011 26. ## Chemistry "A voltaic cell is constructed by immersing a strip of sillver metal in a 1.0 MAgNO3 solution and a strip of cadmium metal in a 1.0M Cd(NO3)2 solution. The circuit is completed by a wire and a salt bridge in the usual way. a. Write the balanced overall asked on March 10, 2011 27. ## math 250mg is equal to what percent of a gram or grams asked on February 1, 2011 28. ## Stats Use this table to answer the questions. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11 1. Identify the class width. 2. Identify the midpoint of the first class. 3. Identify the class boundaries of the first class. 4. Give the asked on December 16, 2010 29. ## physics Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 52 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall. Answer in units of m/s2. asked on November 28, 2010 30. ## Physics Nitrogen gas is introduced into a large deflated plastic bag. No gas is allowed to escape, but as more and more nitrogen is added, the bag inflates to accommodate it. The pressure of the gas within the bag remains at 1 \rm atm and its temperature remains asked on September 1, 2010 31. ## Physics A 90 kg astronaut and a 1100 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.24 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with asked on August 3, 2010 32. ## PHYSICS An alpha particle (which has two protons) is sent directly toward a target nucleus containing 80 protons. The alpha particle has an initial kinetic energy of 0.79 pJ. What is the least center-to-center distance the alpha particle will be from the target asked on April 10, 2008 33. ## statistics Every year thousands of students take the SAT'S. RECENT TRENDS SHOW THAT THE SCORES ON THE VERBAL SECTION FOLLOW AN APPROX. NORMAL DISTRIBUTION WITH MEAN 550 AND STANDARD DEVIATION OF 110 68.26% OF THE STUDENTS WHO TAKE THE SAT VERBAL SCORE BETWEEN ______ asked on February 10, 2008 34. ## Algebra simplify the following expression 10x - 12x asked on November 9, 2007 35. ## Physics 1.There are four charges, each with a magnitude of 2.5 µC. Two are positive and two are negative. The charges are fixed to the corners of a 0.29 m square, one to a corner, in such a way that the net force on any charge is directed toward the center of the asked on February 7, 2007 36. ## Math Find f if f′(x)=2/x,x asked on April 16, 2019 37. ## Maths A single ordered data set includes the following data. 2, 4, 5, 6, 8, 10, x. What is the largest possible value of x if it is not an outlier? asked on April 29, 2017 38. ## Maths If the area of a square is reduced by a factor of 4, how have the sides changed? asked on April 22, 2017 39. ## Maths A,B,C are collinear points and AB=BC. If A is the point (4,5) and B is the point (1,-1) find the coordinates of C. asked on March 16, 2017 40. ## math 3.which one of these is a rational number a 150 b. 441 c. 200 d. 250## asked on February 15, 2017 41. ## math question An aeroplane flies at 800km/h for one third of its flight time and averages 700 km/h for the entire trip. What is the average speed, in kilometres per hour, over the remaining part of the journey? A. 600 B.750 C.650 D.500 E.625 Could you please explain in asked on January 22, 2017 42. ## Maths A cake is divided by removing at each cut one quarter of the cake present before the cut. after three cuts have been made, what is the fraction left of the original cake? Please explain in detail thank you asked on January 21, 2017 43. ## Algebra Four times the sum of 9 and some number is 60. What is the number? asked on December 6, 2016 44. ## World history How did the status of slaves in African society contrast with the Americas? What rights and opportunities were available to slaves in African but limited or prohibited in the Americas ? asked on December 4, 2015 45. ## Chemisty I need a recap of how to do the question below. I just need the basic guidelines: The enthalpy change for the reaction 2H2(g)+O2 > 2H2O is -571.6kJ. Determine the enthalpy change for the decomposition of 24.0g H2O. asked on June 26, 2015 46. ## math Landyn wants to mix concentrate and water together to make her juice. The juice is 15% concentrate and 85% water. Her pitcher can hold 12 cups of juice. How many cups of concentrate does she need? asked on March 25, 2015 47. ## physics A person sitting in a chair (combined mass 80kg) is attached to a 6m long cable. The person moves in a horizontal circle. The cables angle is 62 degrees below the horizontal. What is the persons speed? Note: the radius of the circle is not 6m. I really asked on December 15, 2014 48. ## Algebra what is the magnitude of a vector with an initial point (2,6) and a terminal point (14,11) asked on May 19, 2014 49. ## research How is the Spivak and Sharp (2008) study a replication of the prior study by Bales and colleagues (2005)? asked on March 14, 2014 50. ## math A fisherman has caught a 5kg fish with a line and is lifting it vertically out of the water. While the fish is still in the water he raises it at a constant speed of 0.4 ms^-1. If the water resists this motion with a force of 6N, what is the tension in the asked on October 26, 2013 51. ## physics three antinodes witha peak to peak displacement of 3 cm are observed on a vibrating string of length l and linear density the hanging mass is m what is the velocity of the propagation of transverse waves of the string asked on July 25, 2013 52. ## Physics 200 g of ic is at -5C is dropped into a container containing water at 65C. If the final temperature of the mixture reaches 21C, what mass of water must be present in the container? asked on July 22, 2013 53. ## statistics Do students tend to improve their SAT mathematics (SAT-M) score the second time they take the test/ asked on July 16, 2013 54. ## Math A simply supported beam is 6 meters long and has a mass of 15 kg/m of length. It carries loads = 180 N and 270 N at points 1.2 meters and 3.6 meters from the left end respectively. Find the reactions. asked on July 4, 2013 55. ## science physics 1.) What is the Magnitude of the electrostatic force on a +5 C charge 1.75 m to the left of a -2.5 C charge? (show your work) 2.) In What direction does the force on the +5 C charge act? 3.)Calculate the magnitude of the electric field of the -2.5 C charge asked on May 14, 2013 56. ## Finance A company has total assets of$8,500,000 and its total turnover of 2.35 times. If the return on assets is 9 percent, what is its profit margin? Please help with a formula?

asked on March 18, 2013
57. ## Algebra

I need to find the slope of a ladder that is leaning against a building. The bottom of the ladder is 9 ft from the building and the top of the ladder is 16 ft above the ground.

asked on February 19, 2013
58. ## English

Did you enjoy the Southern hospitality? What are the adjectives in that sentence?

asked on January 9, 2013
59. ## Math 12th grade

Find the sum of each infinite series, or state that the sum doesn'nt exist 1/7+5/14+25/28+

asked on December 16, 2012
60. ## ricon high school

A 6 kg ball is thrown by a catapult at 30 m/s. what is the ball's momentum?

asked on December 15, 2012
61. ## Statistics

Tony’s father, an accountant, has been listening to Tony tell him about Type I errors and α = .05. He responds: “.05? That means you’re making an error one time in twenty! If I made errors 5 percent of the time I’d be out of a job so fast it would

asked on December 2, 2012

Create an application in C# that will accept sales information and calculate the total bill. There are 3 products which can be sold: Product 1 with price of $2.98 Product 2 with price of$4.50 Product 3 with price of $9.75 The application should prompt the asked on September 30, 2012 63. ## 2nd grade math ____= 8+2? asked on September 26, 2012 64. ## math Is 13/0 considered to be undefined? asked on September 23, 2012 65. ## math I have 8 ones and 2 hundreds. I am between 270 and 280. what number am I? asked on September 13, 2012 66. ## math i have fewer ones than tens. the value of my tens is 30.what two numbers can i be asked on September 5, 2012 67. ## Math Please help: find the length of the curve 2y^2 = x^3 from the origin to x=10. asked on August 21, 2012 68. ## Math the acceleration of a particle is defined by the equation a= 4-t^2 with an initial velocity of two millimeters per second. Find the exact equation for the position of the particle if its initial position was zero. asked on July 20, 2012 69. ## algebra during the first part of a trip, a conoeist travels 70 miles at a certain speed. the canoeist travles 7 miles on the second part of the trip at a speed of 5 mph slower. the total time for the trip is 5 hrs. Ehat is the speed on each part of the trip? asked on July 6, 2012 70. ## Calculus x^2-5/x lim x=0^+ asked on April 26, 2012 71. ## calculus Find the total differential for f(x,y,z)= cos(4x+3y+2z+1) asked on April 23, 2012 72. ## calculus Just doing example questions to better understand. Find all first and second partial derivatives for the function u= xy^2+x^2y asked on April 23, 2012 73. ## PHI 103 In the truth table for an invalid argument asked on April 14, 2012 74. ## calculus find dy/dx if y= (x^5)(e^(x^4)) asked on March 6, 2012 75. ## geometry An airplane descends 3.5 miles over a horizontal distance of 25 miles. How far did the plane actually travel? asked on January 18, 2012 76. ## finance Company sales and profits grow at a rate of 30% per year; at the end of 4 years (t4) the growth rate drops to steady 5%. Company recently paid a dividend of$1 per share, and the required return is 20%. What is the value of one share today (t0)? assuming

asked on December 29, 2011
77. ## algebra

Marlene drive 540 miles to visit friend. drive for 3 hours then stopped for gas, then drive 4 more hours stopped for lunch. how many more hours do I drive if my average speed for trip is 60 miles per hour ? How would I write an equation?

asked on December 8, 2011
78. ## MATH

MIKE HAS 2 MATS THAT ARE IN THE SHAPE OF TRIANGLES THE SCALE FACTOR OF THE 2 TRIANGULAR MATS IS 7/9 WHAT IS THE RATIO OF THE PERIMETERS?

asked on November 2, 2011
79. ## math

23x17 in expanded algorithm

asked on September 22, 2011
80. ## calculus

does the sequence a=(2n)! / n! converge? Explain

asked on September 1, 2011

A game is played using one die. There is a$1 charge to play the game. If the die is rolled and shows a five, the player receives$6 back ( a profit of $5 and the original$1). If any other number shows, theplayer loses the original $1. What is the player's asked on July 16, 2011 82. ## Statistics There are 6 batteries. Two are defective. If you pull out two batteries, what is the probability that neither are defective? Is this how you solve it? 4/6 X 3/5 asked on June 20, 2011 83. ## calc Let f(3) = 0, f '(3) = 6, g(3) = 1, and g '(3) = 1/3. If h(x) = f(x)*g(x), find h '(3). asked on April 30, 2011 84. ## calculus Choose the correct quantity to fill in the blank: Integral_______ dx = (ax2 - a2)4 + C. asked on April 30, 2011 85. ## calculus Choose the correct quantity to fill in the blank: Integral_______ dx = (ax2 - a2)4 + C. asked on April 30, 2011 86. ## Math Len flipped a coin 3 times and got a head each time. What are the chances he will get a tail on his next toss? Explain reasoning. would it be 50/50 because there are two sides asked on March 21, 2011 87. ## Algebra Help please 12(74y - (6+5Y - 8Z) = Please show work asked on March 16, 2011 88. ## Algebra 12(74y - (6+5Y - 8Z) = Please show work asked on March 15, 2011 89. ## Algebra 12(74y - (6+5Y - 8Z) = Please show work asked on March 15, 2011 90. ## Algebra 12(74y - (6+5Y - 8Z) = Please show work asked on March 14, 2011 91. ## Math Mrs Sue thank you and you are the best asked on March 10, 2011 92. ## Math Does anyone know the old formula to calculate a hourly raise from a percentage; I totally forgot. The employee makes$10.50 an hour and is receiving a 1.1% increase.

asked on March 10, 2011
93. ## physics

Outside air generally contains some water vapor (typically 1-2% by mass). Does it take more, less, or the same heat to raise the temperature of 1kg moist air than is needed to raise the temperature of 1kg dry air by the same amount?

asked on February 8, 2011
94. ## physics

water 20 degrees celsius flows through a 25 mm diameter pipe at a rate of 50 liters per minute. is this laminar or turbulant flow or both?

asked on February 8, 2011
95. ## chemistry

The Ka of stearic acid is 1.3 x 10^-5. what is the Kb of stearate?

asked on November 15, 2010
96. ## Physics

Block A and block B (see figure below) are forced together, compressing a spring (with spring constant k = 2220 N/m) between them 2 cm from its equilibrium length. The spring, which has negligible mass, is not fastened to either block and drops to the

asked on October 7, 2010
97. ## math

u divided by 7 =3

asked on September 11, 2010
98. ## Physics

A 1.10 kg} block of wood sits at the edge of a table, 0.790 m above the floor. A 1.10×10−2 kg} bullet moving horizontally with a speed of 725 m/s embeds itself within the block. What horizontal distance does the block cover before hitting the ground?

asked on August 3, 2010
99. ## Physics

A bullet with a mass of 4.0 g and a speed of 650 m/s is fired at a block of wood with a mass of 9.7×10−2 kg. The block rests on a frictionless surface, and is thin enough that the bullet passes completely through it. Immediately after the bullet exits

asked on August 3, 2010
100. ## Physics

You shoot an arrow into the air. Two seconds later (2.00 {\rm s}) the arrow has gone straight upward to a height of 32.0 m above its launch point. What is the initial velocity and how long did it take for the arrow to reach 16.0 m above the launch point?

asked on June 30, 2010

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