Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 797

**satistics**

Assume that the math SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. If you score 560 on this exam, what percentage of those taking the test scored below you? semperfi
*March 12, 2015*

**Math**

tom is scheduling his classes for next quarter. he wants to take three classes, and has the following options: spanish at 9, 10, or 11; music at 9 or 11; math at 10 or 12. list possible schedules he would choose
*March 10, 2015*

**dice probability (math)**

if a pair of fair dice is rolled, what is the probability that we roll a total of five if we are given that the total is less than nine?
*February 23, 2015*

**Math**

it cost $2 to buy a raffle ticket. if there are 500 tickets sold, and there is one first prize of $250, three second prizes of $100, and five third prizes of $50, what is the expected value of this raffle?
*February 22, 2015*

**Math**

so is this right?
*February 9, 2015*

**Math**

100
*February 9, 2015*

**Math**

A circle is divided into 18 equal parts.How many degrees is the angle for each part? How many degrees is the angle for 5 parts into ?
*February 9, 2015*

**Math**

Luka is eating crackers. Each serving has 1.6 grams of fat. She ate 0.75 serving of crackers at lunch. She is now eating 1.5 servings of crackers as a snack. How many grams of fat did Luka eat all together? Explain how you solved the problem
*November 6, 2014*

**MATHS**

Three fair coins are tossed at the same time. What is the probability that one of the coins will show heads and other two will show tails?
*September 24, 2014*

**Statics**

I have a structure that is constructed of circular rod that has a mass of 7 kg per meter of length. I must determine the moment Mo about O caused by the weight of the structure. From the origin (O), the structure is 2m tall (z direction), branches outward in the y direction 1....
*September 24, 2014*

**math**

Calories Burned = 234n 234 comes from (9 blocks to work + 9 blocks from work)(13 calories per block)
*September 24, 2014*

**MATHS**

Three fair coins are tossed at the same time. What is the probability that one of the coins will show heads and other two will show tails?
*September 23, 2014*

**Physics**

Assume the length of an organ pipe is L=24cm. You have excited the wave in the tube, and you observe that it has displacement nodes at 4cm, 12cm, and 20cm measured from one end of the pipe. In which harmonic, n, is the air in the pipe oscillating? What is the frequency of the ...
*September 16, 2014*

**Physics**

You snap your fingers at the open end of a 1 meter long tube that is closed at the other end. With a microphone at the open end, you determine that it takes 5.8msec between the time you snap your fingers and the echo from the closed end is detected. Based on this info, ...
*September 15, 2014*

**Statics**

A former student of mechanics wishes to weigh himself but has access only to a scale A with capacity limited to 100 lbs and a small 24-lb spring dynamometer B. He discovers that when he exerts a pull on the rope so that B registers 22 lb, the scale A reads 80 lb. What is his ...
*September 15, 2014*

**Statics**

A former student of mechanics wishes to weigh himself but has access only to a scale A with capacity limited to 100 lbs and a small 24-lb spring dynamometer B. With the rig shown he discovers that when he exerts a pull on the rope so that B registers 22 lb, the scale A reads ...
*September 14, 2014*

**criminal justice**

How does a warden address ethical issues between the correctional officers and the inmates?
*September 8, 2014*

**Physics, Electricity and Magnetism, Sciences**

Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...
*September 5, 2014*

**Physics**

A 49-N force is applied perpendicular to the portion BC of the bent bar. Determine the moment of P about point B and about point A. The image shows a bar that is straight from point A to B but then bends at a 42 degree angle to the left from point B to point C. The distance ...
*September 3, 2014*

**Accounting**

What is the closing entry to allocate a net income of $48,000 to Sara, Ellen, and Mary? Respective capital balances are $30,000, $40,000, and $30,000. No agreement was made for division of income. A. Debit Income Summary $48,000; credit Sara’s Capital $16,000; credit ...
*June 9, 2014*

**chemistry**

what will be the pH of a solution NaOH with the concentration 2,2.10mol
*May 28, 2014*

**Physics**

7.252
*May 16, 2014*

**Algebra II**

Ravi is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges $75 and allows unlimited mileage. Company B has an initial fee of $55 and charges an additional $0.80 for every mile driven. For what ...
*April 2, 2014*

**Algebra II**

Suppose that an object is dropped from a height of h meters and hits the ground with a velocity of v meters per second. Then v= sqrt19.6h. If an object hits the ground with a velocity of 24.2 meters per second, from what height was it dropped? Carry your intermediate ...
*April 1, 2014*

**Maths**

In covering distance, the speeds of A & B are in the ratio of 3:4.A takes 30min more than B to reach the destination. Find time taken by A to reach the destination?
*March 20, 2014*

**Chemistry**

I'm sorry for the late reply, I now just got back to this. Thank you so much!
*February 20, 2014*

**Chemistry**

Please help me. :(
*February 20, 2014*

**Chemistry**

Is it that the three different people weighed something of 2.00g and got the readings of 7.32 g for the weight? So, in that case, would the answer be A?
*February 20, 2014*

**Chemistry**

Three people weigh on a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 for the mass of the standard. These results imply that the balance that was used is ___________. a) neither accurate nor precise b) accurate c) precise d) accurate and ...
*February 20, 2014*

**Math probability - HELP**

A bag contains 3 red, 5 yellow, 2 green and 6 blue marbles. If one marble is chosen at random, replaced, and then a second marble is chosen at random, find the probability of obtaining 2 marbles of different colors.
*January 23, 2014*

**Math**

A bag contains 3 red, 5 yellow, 2 green and 6 blue marbles. If one marble is chosen at random, replaced, and then a second marble is chosen at random, find the probability of obtaining 2 marbles of different colors.
*January 22, 2014*

**Grade 5 maths**

Alan, Bill and Carl shared $372. After Alan spend 2/ 5 of his share, Bill spent 1 /2 of his share and Carl spent 1/3 of his share, the boys found they had the same amount of money left. (a) What is the ratio of Alan's share to Bill's share to Carl's share? (b) How ...
*January 21, 2014*

**maths- year 5**

If the students were given 80cm square of wooden board to make a box, what is the largest cube they can make with the board?
*January 15, 2014*

**maths**

There are a total of 50 ducks and goats in a farm. They have 154 legs altogether. How many ducks are there?
*January 13, 2014*

**math**

lmagine an equilateral triangle and a square. The triangle has sides of 10 m and the square has sides of 15 m. One ant walks completely round the triangle twice and a beetle which walks two and a half times as fast starts walking at the same time around the square. How many ...
*January 12, 2014*

**MATH**

7/10 of Delia's money is equal to 1/5 of Sarah's money. They have $225 altogether How much does Delia have?
*January 6, 2014*

**Physics- hard problem**

A 14000 N automobile travels at a speed of 40 km/h northward along a street, and a 7000 N sports car travels at a speed of 62 km/h eastward along an intersecting street.(a) If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the ...
*December 19, 2013*

**Physics**

A automobile travels at a speed of northward along a street, and a 7000-N sports car travels at a speed of eastward along an intersecting street. (a) If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the velocity of the cars be ...
*December 19, 2013*

**calculus**

Use Euler's method with step size .2 to estimate y(.4), where y(x) is the solution of the initial value problem y=x+y^2, y=0. Repeat part a with step size .1
*November 10, 2013*

**Really need help in Calculus Problem?!**

Use Euler's method with step size .2 to estimate y(.4), where y(x) is the solution of the initial value problem y=x+y^2, y=0. Repeat part a with step size .1
*November 10, 2013*

**Calculus**

Find the Taylor series of f(x) = sin(x) at a = Pi/3.
*September 23, 2013*

**geometry**

that gives me a definition i deed an explanaiton
*September 16, 2013*

**geometry**

what does the definition of angle bisector mean
*September 16, 2013*

**english**

PLEASE HELP bruces viewpoint made long range planning very difficult for him. what word goes in the blank a:subliminal b:perceptive c:myopic D: discerning i know the definitions but its still hard i think its myopic
*September 14, 2013*

**Calculus**

Find the limit of the sequence {√(2), √(2√(2)), √(2√(2√(2))),...
*September 10, 2013*

**chemistry**

A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. What is the price of one gram of mercury?
*September 5, 2013*

**physics**

An athlete swims from the north end to the south end of a 50.0m pool in 20.00s and makes the return trip to the starting point is 22.0s
*August 21, 2013*

**STATISTICS**

Wrong and quit cheating on your stats exam
*August 6, 2013*

**MATHS**

Logan Academy students take part in four field trips during the school year. They visit a library, a museum, a park, and a zoo. How many different ways can the four trips be ordered for the school year?
*May 13, 2013*

**Calculus**

Estimate ç4 1 ln(x)−3dx using 6 midpoint rectangles
*May 12, 2013*

**Maths**

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.
*April 19, 2013*

**Mathematics**

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.
*April 18, 2013*

**Calculus**

An animal population is increasing at a rate of 150+20t animals per year. By how much does the animal population increase between year 5 and year 8?
*April 12, 2013*

**physics**

The figure below shows three circuits, each consisting of a switch and two capacitors, initially charged as indicated. Let qL represent the charge on the left-hand capacitor in each circuit. The switches in all circuits are then closed.
*April 9, 2013*

**Chemistry**

no idea
*April 1, 2013*

**physics**

A group of swimmers is resting in the sun on an oﬀ-shore raft. They estimate that 2.85 m separate a trough and an adjacent crest of surface waves on the lake. They count 13 crests that pass by the raft in 20 s. How fast are the waves moving?
*March 23, 2013*

**Calculus**

At 2:00 PM a car's speedometer reads 30 mi/h. At 2:10 PM it reads 50 mi/h. Show that at some time between 2:00 and 2:10 the acceleration is exactly 120 mi/h^2.
*March 4, 2013*

**Calculus**

Suppose that 3<= f'(x) <=5 for all values of x. Show that 18 <= f(8)-f(2) <=30.
*March 4, 2013*

**physics**

A 0.4 kg hockey puck moving at 30 m/s hits a straw bale, stopping in 1.4 s. What impulse was imparted to the hockey puck?
*February 9, 2013*

**Calculus**

Two people start from rest at the same point. One walks east at 3 mi/h and the other walks northeast at 2 mi/h. How fast is the distance between the people changingg after 15 minutes?
*February 3, 2013*

**Calculus**

A lighthouse is located on a small island 3 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from P?
*February 3, 2013*

**Calculus**

A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1 m/s, how fast is the boat approaching the dock when it is 8 m from the dock?
*February 3, 2013*

**Calculus**

A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.6 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
*February 3, 2013*

**maths**

Suppose you have $9000 to invest and you invest part of it ($×) in a high risk venture at 11.5% per annum and the remainder with the bank at 4.5% per annum, both for one year. 1) write an algebraic expression for the amount of money invested at 4.5% 2) write an algebraic...
*January 27, 2013*

**Physics, help me!**

On a curved roadway of radius 100m, the suggested speed is 35mph(approximately 16m/s). What must the coefficient of friction be between a car's tires and the road for the car to safely negotiate the curve at the posted speed?
*January 15, 2013*

**English**

LOL so true ^
*December 17, 2012*

**physics**

the initial velocity of a 4 kg box is 11 m/s, due west. after the box slides 4 m horizontally its speed is 1.5 m/s. determine the magnitude and the direction of the non conservative force acting on the box as it slides.
*December 16, 2012*

**trig**

A plane has an airspeed of 200 miles per hour and a heading of 28.0°. The ground speed of the plane is 207 miles per hour, and its true course is in the direction of 38.0°. Find the speed and direction of the air currents, assuming they are constants. (Round your ...
*November 29, 2012*

**abnormal psych**

# 1.44 (1 pts.) Dr. Green is an admitting psychologist at a psychiatric hospital. Unfortunately, every client she interviews receives the diagnosis of schizophrenia. Dr. Green's diagnostic system ignores A) reliability. B) variance. C) base rates. D) treatment potential...
*November 27, 2012*

**psych**

21(1 pts.) Based on the incidence of Fetal Alcohol Syndrome in various ethnic groups, which of the following individuals would be considered high risk? A) a woman of French Canadian descent B) a woman of Irish descent C) a woman of Italian descent D) a woman of Native American...
*November 27, 2012*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides in elastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 18, 2012*

**Physics**

A circular disk of radius 30 cm is rotating with an angular velocity of 2 radians / s. What is the tangential velocity of a point on the rim of the disk? What is its centripetal acceleration?
*November 18, 2012*

**Science**

What is the power of a 900 n force applied over a distance of 40 m for 45 sec? What is the horsepower?
*November 16, 2012*

**Physics**

A force of 5 N is applied to a door perpendicular to its face at a distance of 0.75 m from its hinge. What is the torque on the door about the hinge?
*November 16, 2012*

**Physics**

A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
*November 14, 2012*

**Physics**

A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
*November 14, 2012*

**Physics**

A force of 25 N accelerates a body by 5 m/s2. What is the mass of the body?
*November 9, 2012*

**Math**

One calling plan offers long distance calls for .03 per minute. Another plan costs $2.00 per month but offers long distance service for 0.01 per minute. Write and solve an equation to find the number of long distance minuets for which the two plans would cost the same.
*November 6, 2012*

**science**

82 liters plus 3.876 liters is what?
*October 11, 2012*

**Algebra**

You have to wrap gift boxes for your club project. Each box is 4.5 inches wide, 7 inch long, and 4 inches tall. What size sheet of wrapping paper do you need to cut to cover the box? Gift wrap paper comes in sheets which are 30 inches wide and 36 inches long. How should you ...
*October 4, 2012*

**homework**

which locations have the greatest number of hours of daylight on june 21? the fewest hours of daylight?
*October 2, 2012*

**physics**

magnitude: 1.83 m/s^2 acceleration: left or -x axis
*September 30, 2012*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.82 m. The stones are thrown with the same speed of 9.83 m/s. Find the location (above the base of the ...
*September 30, 2012*

**Geometry**

A rectangular garden has an area of 55m2 and a perimater of 32 m. If its length is doubled, what is the % of increase on the new area and perimeter?
*September 26, 2012*

**Pre Algebra**

simplify the following expression x+4(y+8x) Write the property that justifies each step
*September 26, 2012*

**Chemistry**

What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
*September 19, 2012*

**Chemistry**

What is the value of the rate constant for a reaction in which 75.0 percent of the compound in a given sample decomposes in 80.0 min? Assume first order kinetics. Use the integrated rate law for a first order reaction. Remember at 75 percent reaction, 25 percent of the ...
*September 19, 2012*

**Math**

The answer is.... wait for it... Looking at the first equation, we see we are adding 4+4 =8 and using "00" to finish the addition. In other words, we are just adding the first numbers and using the zeros as place holders. So, in the second problem, add the 24+34 and ...
*September 11, 2012*

**maths**

Please help! At a cup cake baking competition, Alan baked 55 fewer cupcakes than Tom while Sally baked twice as many cupcakes as what Alan and Tom baked together. If the three of them baked a total of 1125 cupcakes, how many cupcakes did Tom bake? Many thanks
*July 1, 2012*

**chemistry**

2H2+1O2=2H2O delta H=-136 kJ A) how many joules are released when 35.0 grams H2O form B)how many grams of hydrogen burn when 278 kJ are released. C) Draw a potential energy diagram of this reaction.
*May 7, 2012*

**science, chemistry**

2Al(s)+ 3Cl2(g)=2AlCl3(s) For the above reaction calculate: A) delta H, then state whether the reaction is endothermic or exothermic B) delta s, then whether the reaction becomes more or less disorder. C) delta G, the state whether the reaction is spontaneous or non-spontaneous
*May 7, 2012*

**Chemistry**

The free energy of a single electron falling through a potential difference of one volt is 1 electronvolt (eV). Therefore, on a per electron basis, x volts → x eV. Calculate the maximum wavelength of light (in nanometers) that provides enough energy to an electron to ...
*May 6, 2012*

**science-chemistry**

a bicycle tire that has a volume of 0.85L is inflated to 140 pounds per square inch. What will be the pressure in the tire if the number of moles of gas is doubled?
*April 29, 2012*

**Science-Chemistry**

and do i do the same thing for number 2?
*April 29, 2012*

**Science-Chemistry**

1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance. 2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled 7.6m in the same amount...
*April 29, 2012*

**science-chemistry**

can u help me on part c a little more?
*April 29, 2012*

**science-chemistry **

please anwser soon, a rigid 4.10L flask contains a mixture of 1.25 moles of H2, 0.250 mole of O2, and sufficient Ar so that the partial pressure of Ar in the flask is 1.00 atm. The temperature is 63.5 degrees C A) Calculate the total pressure in the flask B) calculate the mole...
*April 29, 2012*

**Chemistry**

2CO(g) + O2(g) 2CO2(g) Go = -511.6 kJ and So = -173.1 J/K at 314 K and 1 atm. The maximum amount of work that could be done by this reaction when 2.43 moles of CO(g) react at standard conditions at this temperature is__________ kJ. how?!
*April 26, 2012*

**algebra**

Cupcakes cost $1.50 each to produce with fixed cost of $50. a) Express the cost C, of producing the cupcakes as a linear function of x cupcakes produced. b)Find the average cost, C=C/x and simplify appropriately. c) What is the horizontal asymptote of C? Interpret. d) Graph C ...
*April 16, 2012*

**math**

There are 20 10% off cards, 10 15% off cards, 6 20% off cards and 4 50% off cards. What is the probability that a person will draw a 50% off card on the third draw?
*April 12, 2012*

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