Thursday

October 8, 2015
Total # Posts: 876

**Chemistry**

A sealed flask contains 1 mole of hydrogen and 3 moles of helium gas at 20DC. If the total pressure is 40kPa, what is the partial pressure of the Hydrogen gas? AND :) The data below was obtained by a student in order to determine the percent of water in a Hydrate: Mass of the ...
*March 31, 2013*

**stats**

One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.
*March 24, 2013*

**Stats.**

One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.
*March 24, 2013*

**Physics!**

The steel I-beam in the drawing has a weight of 9.03 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? With both angles being 70 degrees
*March 22, 2013*

**Physics!**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 860 m/s2 and the vertical or y component of its acceleration is 930 m/s2. The ball's mass is 0.38 kg. What is the ...
*March 22, 2013*

**Chemistry**

At a given Temperature, the elementary reaction A<--->B in the forward direction is first order in A with a rate constant of 3.90*10^-2s^-1. The reverse reaction is first order in B and the rate constant is 8.20*10^-2s^-1. What is the value at equillibrium for the ...
*March 18, 2013*

**stats.**

z=(1.25-1.35)/(0.25sqrt40)= -0.0791 z=(1.50-1.35)/(0325sqrt40)= 0.0791 but not sure how to read the z scores I dont know if it would be.5000-.5000 or what can someone please help me on the z scores for -0.0791 and 0.0791
*March 18, 2013*

**stats.**

The mean number of bumped airline passengers per day is 1.35 and the standard deviation is 0.25. For a random selection of a group of 40 days, what is the probability that the mean of bumped passengers for the 40 days will be between 1.25 and 1.50?
*March 18, 2013*

**stats.**

so would part a be .4207=(x-550)/100 ?
*March 18, 2013*

**stats.**

The GMAT test is required for admission to most graduate programs in business. In a recent year, the GMAT test scores were normally distributed with a mean of 550 and standard deviation of 100. A. Find the first quartile for the distribution of GMAT scores. B. Find the median ...
*March 18, 2013*

**stats.**

The mean number of bumped airline passengers per day is 1.35 and the standard deviation is 0.25. For a random selection of a group of 40 days, what is the probability that the mean of bumped passengers for the 40 days will be between 1.25 and 1.50?
*March 18, 2013*

**Stats.**

Thank you so much
*March 18, 2013*

**Stats.**

The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of a group of 48 vehicles is selected find the probability that the mean of the group’s age is between 90 and 100 months. ...
*March 18, 2013*

**math**

$30
*March 16, 2013*

**Physics....PLEASE HELP**

A motorcycle has a constant acceleration of 2.13 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 24.0 to 34.0 m/s, and (b) 54.0 to 64.0 m/s
*March 15, 2013*

**physics**

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 91.9 m/s2 for 1.53 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...
*March 15, 2013*

**Math**

If there are 51 students on a bus and 2/3 got off how many students got off the bus
*March 14, 2013*

**Math**

If there are 51 students on a bus and 2/3 got off how many students got off the bus
*March 14, 2013*

**math**

What weighs less 4.09 kilogram or 4.196 kilogram.
*February 28, 2013*

**Physics**

the world may never know.
*February 6, 2013*

**Pre-AP Science**

an atom consists of 10 neutrons ,10 electrons,and 9 protons. The atom has gained an electron resulting in a charge of -1. What is its mass number?
*February 4, 2013*

**math**

hi i dont know the answer please help me
*February 4, 2013*

**julius caesar**

The Roman crown will appear several times in the play. What is your impression of them in this scene? Cant figure this one help!!!!!!!
*February 1, 2013*

**julius caesar**

what does the atmophere and the political situation reveal in act one scene 1
*February 1, 2013*

**Math2**

A bacteria culture had a population of 10 million at 10:00 A.M., and by 2:00 P.M. had grown to 14 million. (a) Predict the population at 6:00 P.M. that same day. (Round your answer to one decimal place.) (b) When will the population double in size? (Round your answer to the ...
*January 30, 2013*

**Math**

The 1989 World Series San Francisco quake was initially reported to have magnitude 7.0, but later this was revised to 7.1. How much energy released corresponds to this increase in magnitude? (Round your answer to two decimal places.)
*January 30, 2013*

**math**

could it be h<48 cuz thats one of the answer choices
*January 27, 2013*

**math**

in order to be able to ride a roller coaster you must be 48 inches tall .which inequality represents this situation?
*January 27, 2013*

**math**

I need to solve this problem. A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?
*January 22, 2013*

**alg/trig**

9/x + 9/x-2= 12
*January 21, 2013*

**Science math**

8';0.148
*January 7, 2013*

**math final review (help)**

from a 12cm by 12cm piece of cardboard, square corners are cut out so that the sides can be folded up to make a box. Express the volume of the box as a function of the length, x, in centimeters.
*December 16, 2012*

**Applied Business Law**

The first party who is to file the statement has the priority to the collateral. The person signing over the papers and giving the bank permission to take the collateral has every right to calm the property that was disclosed in the financing statement. Agile borrowed five ...
*December 11, 2012*

**ALGEBRA 2 urgent!!**

if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.
*December 10, 2012*

**Physics**

Here's the question: A 55 kg swimmer is standing on a stationary 235 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.3 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and ...
*December 10, 2012*

**Physics**

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.009 kg, and its velocity is +735 m/s. Her mass (including the ...
*December 10, 2012*

**Math**

single large rectangle steve
*December 10, 2012*

**Math**

if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.
*December 10, 2012*

**chemistry**

How many moles of glucose would be present in: 1Litre of a 5micromolar solution?
*December 3, 2012*

**chemistry**

Does molecular weight of water (H2O) = atomic weight of 2H + O = 2(1.008) + 15.999 = 18.015g ~ 18.02g (4. sig. fig.) is it correct?
*December 3, 2012*

**chemistry**

1.To make the following saline solution (375ml 0.5% w/v sodium chloride). I have weighed 1.875g of NaCl. What will be the volume of water that is required?
*December 3, 2012*

**math**

there were 360 pumpkins in a pumpkin patch , but it was difficult for farmer alexander to find the perfect pumpkin. evry third pumpkin was too small. every fourth pumpkin was too green. every fifth pumpkin had a broken stem. every sixth pumpkin had the wrong shape. How many ...
*November 22, 2012*

**math**

Is the correct answer 1400.
*November 16, 2012*

**math**

At Strawberry State College, the ratio of females to males is 2:1. If there are 2100 students, how many are female and how many are male?
*November 16, 2012*

**math**

On a TV game show, a contestant makes $800 for every correct answer but loses $500 for every wrong answer. After answering 26 questions, Sarah broke even. How many questions did she answer correctly?
*November 16, 2012*

**physics**

what is acceleration of an object over a 4second period if its starting velocity is 8 m/s and it velocity is 20 m/s?
*November 13, 2012*

**chemistry**

I would like to know what volume of water you use? How to calculate the volume of water?
*November 13, 2012*

**chemistry**

2. Sulfuric acid comes from the oxidation of sulfur. The stages of the reactions are given below: S + O2 --> SO2 ∆H= -296.8 kj SO2 + 1/2 O2 --> SO3 ∆H= -98.9 kj SO3 + H2O --> H2SO4 ∆H= -130.0 kj The typical plant produces 750 tons of H2SO4 per day. ...
*November 10, 2012*

**Chemistry**

Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?
*November 10, 2012*

**geography **

john who lives at 35 degrees north and 120 degrees west regularly calls Geroge his business partnet at 2pm (John's local time) every day during July last year. George regularly recevied the calls at 10 pm ( his local time). throughout the month, George reported that the ...
*November 4, 2012*

**math**

If you are flying to a city 800 miles away, what will be the difference in flight times between flying into a 40-mph headwind and flying with a 40-mph tailwind if the plane's maximum speed with no wind is 160 mph?
*November 1, 2012*

**math**

Jacob opens a savings account on January 1 with a deposit of $350. He has "direct deposit," in which $25 is deposited every other week. The bank also charges a $3 monthly processing fee. How much money will he have at the end of the year?
*November 1, 2012*

**math**

-16343-x=-343 Find x
*November 1, 2012*

**math**

Jacob opens a savings account on January 1 with a deposit of $350. He has "direct deposit," in which $25 is deposited every other week. The bank also charges a $3 monthly processing fee. How much money will he have at the end of the year?
*October 31, 2012*

**math**

If you are flying to a city 800 miles away, what will be the difference in flight times between flying into a 40-mph headwind and flying with a 40-mph tailwind if the plane's maximum speed with no wind is 160 mph?
*October 31, 2012*

**math**

Alex came home after school one day and found that his mother had left a plate of cookies. Alex ate 1/4 of the cookies. When his sister Bernice came home, she ate 1/3 of the remaining cookies, and when Carla came home, she ate 1/2 of the cookies on the plate. When their mother...
*October 31, 2012*

**math**

Below are the median prices of homes sold in 2009, by region of the country. South 158,300 Northeast 248,800 Midwest 139,500 West 243,200 U.S. 180,100 The median selling price of a home in the South was approximately what fraction of the median selling price of a home in the ...
*October 31, 2012*

**math**

Name three factors of 100,000,000 that are not multiples of 10.
*October 26, 2012*

**math**

If 72 divides m, what other numbers must divide m? If 55 divides m, what other numbers must divide m? (Enter your answers as a comma-separated list.)
*October 26, 2012*

**math**

The factors of a number include 9, 12, and 20. What is the smallest number this could be? List all the factors of this number
*October 26, 2012*

**math**

The GCF of two numbers is 15. Their LCM is 450. What are the two numbers? (Enter your answers as a comma-separated list.)
*October 26, 2012*

**math**

A child has a large supply of dominoes, each of which measures 16 millimeters by 88 millimeters. She wants to lay them out to form a solid square, and she wants them all to be laid out horizontally. What will be the dimensions of the smallest square that she can form, and how ...
*October 26, 2012*

**math**

George vacuums the rugs every 18 days, mows the grass every 9 days, and pays the bills every 15 days. Today he did all three. How long will it be before he has another day like today?
*October 26, 2012*

**math**

Ann and Bob are cycling on a track. Ann completes one lap every 15 seconds, and Bob completes one lap every 18 seconds. When will Ann lap Bob, assuming that they started together?
*October 26, 2012*

**math**

I am thinking of a two-digit number in which the sum of the digits is 9 and the number is even. These clues alone do not create one answer. Add one more clue so that there is only one answer. Both digits are divisible by 2. The difference of the digits is 2. Both digits are ...
*October 26, 2012*

**math**

A manufacturer sells widgets, each of which is packaged in a box whose dimensions are 8 centimeters by 8 centimeters by 8 centimeters. Design the dimensions of a box to ship widgets. Your box must hold at least 1000 widgets. (Enter your answer in the form length, width, height...
*October 26, 2012*

**math**

Suppose the U.S. federal debt was $9,400,000,000,000. Let's say that the decision was made to reduce the debt by $10 million per day. How long would it take to pay off the debt at this rate? (Round your answer to the nearest year.)
*October 10, 2012*

**math**

In order to make the most accurate calendar, the following system was devised. Leap years occur every 4 years except for years ending in 00, but years divisible by 400 are leap years. In this case, the year is a leap year if it is divisible by 400. Which of the following years...
*October 10, 2012*

**math**

This problem from China is almost 2000 years old: Find a number that when divided by 3 gives a remainder of 1, when divided by 5 gives a remainder of 4, and when divided by 7 gives a remainder of 2.
*October 9, 2012*

**math**

When items in a box are put in groups of 3 or 5 or 6, there is always 1 item left over. How many items are in the box if there are fewer than 50?
*October 9, 2012*

**chemistry**

A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium solution, the equilibrium ...
*September 29, 2012*

**Sociology**

Discuss the conclusions of Margaret Mead concerning temperament, and explain how she arrived at her conclusions.
*September 27, 2012*

**physics**

You pull a 18 kg sled across the floor with a strap that is at an angle of 40° above the horizontal with a force 86 N. Find the magnitude of the acceleration of the sled, given that the coefficient of kinetic friction between the sled and the floor is 0.23.
*September 22, 2012*

**Office administration**

Why are files reduce in an organisation?
*September 22, 2012*

**Physics**

A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.30 m/s relative to the water, but a uniform water current flows with speed 2.83 m/s in the southeast direction. (a) What direction should the dolphin head? (b) How ...
*September 13, 2012*

**physics**

Sheena can row a boat at 2.90 mi/h in still water. She needs to cross a river that is 1.22 mi wide with a current flowing at 1.55 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...
*September 13, 2012*

**Calculus**

limit as x-->4- (from the left) of (3[[x]]-5) [[absolute value.]]
*September 10, 2012*

**Calculus**

find the limit(if it exists), if not explain why. lim x--> 4- (3[[x]]-5)
*September 10, 2012*

**world geography**

Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city
*September 7, 2012*

**vocab**

What is a compound sentence for abnegation?
*September 3, 2012*

**World Geogrpahy **

what does the cartogram tell you about japan?
*August 31, 2012*

**Physics**

A school bus takes 0.92 h to reach the school from your house. If the average velocity of the bus is 18.3 km/h to the east, what is the displacement?
*August 28, 2012*

**algebra**

Solve. (x-4)=18
*August 24, 2012*

**algebra**

Solve by using the square root property. (x+7)^2=-11
*August 24, 2012*

**Algebra 1**

what are the length and width of a rectangle if the area is 13.5 square units and the length of one side is .5 the measure of the perimeter?
*August 22, 2012*

**Math **

I posted this question before but accidentally typed in the wrong values! Please help, I just need to know the basic formula my book didn't provide any examples. For the function y = -2sin(x-(pi/3)) between x = 0 and x = 2pi : (6 marks) For what value(s) of x does y have ...
*August 14, 2012*

**algebra**

A motel clerk counts his $1 and $10 bills at the end of the day. He finds that hes has total of 64 bills having combined monetary value of $217. Find the number of each denomination that he has.
*August 14, 2012*

**algebra**

It would cost $79.59 to buy three tickets in Japan plus two tickets in Switzerland. Three tickets in Switzerland plus two tickets in Japan would cost $75.31. How much does an average movie ticket cost in each of these countries?
*August 13, 2012*

**algebra**

A store mixes Brazilian coffee worth $11 per kilogram and Venezuelan coffee worth $15 per kilogram. The mixture is to sell for $14 per kilogram. Find how much of each is needed to to make a 216-kilogram mixture. Brazilian coffee needed- Venezuelan coffee needed-
*August 13, 2012*

**algebra**

Solve by using the elimination method. 9x-y=72 x+4y=45
*August 13, 2012*

**algebra**

Solve by using the elimination method. 7x-8y=-20 8x+7y=74
*August 13, 2012*

**algebra**

Solve by using the elimination method. 2x=2+4y -3/2x+y=-31/2
*August 13, 2012*

**algebra**

What are the coordinates for each equation. 3x-2y=-18 -3x-y=0
*August 13, 2012*

**algebra**

Solve by the substitution method. 2x+7y=16 x=22-7y
*August 13, 2012*

**algebra**

Solve the system of equations by graphing. -3x-2y=18 3x-y=0
*August 12, 2012*

**algebra**

Solve by the elimination method. 2x-7y=-36 7x+2y=33
*August 12, 2012*

**trig **

Construct the equations of the following trigonometric functions: A)A sine function with amplitude 2, period , phase shift /3 right B)A tangent function with a reflection in the y-axis, period ¾, translation up 5 units C)A cosine function with period 270°, ...
*August 12, 2012*

**trig**

For the function -2sin(x-(pi/3)) between x = 0 and x = 2 : (6 marks) For what value(s) of x does y have its maximum value? For what value(s) of x does y have its minimum value? For what value(s) of x does y=1?
*August 12, 2012*

**Math**

What is the maximum number of nonoverlapping squares with sides of length 3 that will fit inside of a square with sides of length 6?
*August 10, 2012*