Friday
December 19, 2014

Posts by Chris


Total # Posts: 2,259

math
All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.
April 9, 2013

math
All varieties of a certain brand of cookies are $3.50 A person buys peanut butter and chocolate chip cookies. Write an expression that tepresents the total cost.
April 9, 2013

Check answers please Statistics
Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student is absent =30 3) three student is absent =...
April 8, 2013

Math Help
Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent 2) one student is absent 3) three student is absent 4) at least ...
April 8, 2013

math
Math systems 3x-2y-z=-20 x-y=10
April 8, 2013

stats
The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation ó is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years. a. Find the 99% ...
April 7, 2013

stats.
so 2.575=10/what would n be?
April 7, 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.
April 7, 2013

stats.
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
April 4, 2013

Math- Partial Fractions
Decompose the following into partial fractions after factoring the denominator as much as possible. Please show some work so I can understand how you did it. 1)x^2/((x-1)(x^2+5x+4)) 2)(3x^3-5x^2+12x+4)/(x^4-16) 3)1/(x^2 (x+1)^2 ) 4)(x+1)/((x^2+1) 〖(x-1)〗^2
April 4, 2013

stats
given n=74 an x=32.find ^p and ^q
April 4, 2013

math
the perimeter of a triangle is 79.75 inches. the second side of the triangle is half as big as the first side. the third side is 7.25 in greater than the first side what is the length of the longest side of the triangle?
April 3, 2013

stats.
The mean number of bumped airline passengers per day s 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 number of bumped passengers for the 40 days will be between 1.25 and 1.50?
April 2, 2013

stats.
The amount that airlines spend on food per passenger is normally distributed with mean $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50.
April 2, 2013

stats
Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13
April 2, 2013

Math
An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
April 1, 2013

Math/ Calculus Please HELP!!!
hey thanks but i still dont get how you arrived to this answer?
April 1, 2013

Math
how many even 4 digit whole numbers exisit such that the thousands digit it odd all 4 digits different
March 31, 2013

stats
I am so lost I know the mean is 0.504 so is the SEM 1.96?
March 31, 2013

stats
n a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
March 31, 2013

stats
what is n
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 31, 2013

stats
The standard deviations s for the annual medical costs 30 heart disease patients was found to equal $1005. Find a 95 % confidence interval for the standard deviation of the annual medical costs for all heart disease patients.
March 31, 2013

stats
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...
March 31, 2013

math
thank you
March 28, 2013

math
mary jogged 5 7/10 miles on monday and 4 1/8 miles on tuesday. Raul jogged 6 1/2 miles on monday and 3 4/5 miles on tuesday. How much farther did raul jog on monday than tuesday.
March 28, 2013

algebra
The perimeter of a triangle is 47 miles. The first side is 5 miles less than twice the second and the third is 2 miles more than the first. Find the lengths of each side.
March 28, 2013

math
find the rule: X=8,9, 10,11,12 y=8,10,12,14,16
March 27, 2013

Chem
Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.170 M in HClO4(aq) at 25 °C.
March 27, 2013

history
It is Populist . Correct.
March 25, 2013

Chemistry
Calculate the volume of 0.3MHCL used to neutralise NaOH solution
March 25, 2013

Math/ Calculus Please HELP!!!
A truck driver, on assignment from the owner of the truck is to drive on a 300 mile stretch of highway at a constant speed of v miles per hour. According to road signs, the minimum speed allowed is 55 miles per hour and the speed limit is 70 miles per hour. The cost of gas on ...
March 24, 2013

math
A girl 1.6 m tall, stands 3.6 m from a lamp post at night. Her shadow from the light is 0.9m long. How high is the lamp post?
March 20, 2013

math
the increasing global temperature can be modeled by I=0.1e^(0.02t) where I is the increase in global temperature in degrees Celsius since 1990 and t is the number of years since 1990. How much warmer was it in 2000 than in 1950? iIn what year will the temp be 4 degrees Celsius...
March 18, 2013

Chemistry
Is the dissolution of calcium sulfate endothermic or exothermic? How do you know?
March 17, 2013

stats
The amount that airlines speed on food per passenger is normally distributed with means $8.00 and standard deviation $2.00. What is the probability that a randomly selected airline spends more than $12.50?
March 17, 2013

stat.
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 17, 2013

accounting
Dan and Joan want to buy an airplane. They find one that will cost $200,000. They must pay 10% down, and can get the balance financed with a 10 year loan at 7% interest and annual payments. What is their annual payment? Answer $26,826 $25,626 $24,457 $19,260
March 16, 2013

Chemistry
Write a balanced equation for the following: aqueous barium chloride reacts with aqueous sodium chromate to form aqueous sodium chloride plus solid barium chromate.
March 14, 2013

chemistry
I got .369 g Rh(OH)3. RIGHT?
March 14, 2013

Chemistry
hey i got Sb2O5 for the oxide is O5 right?
March 14, 2013

Ms. Sue please science
yea sweet cheeks;)....your welcome.
March 13, 2013

Chem 1
is there a formula that i am suppose to use?
March 13, 2013

Chem 1
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0g of luminol into a total volume of 75.0 \rm mL of \rm H_2O. What is the molarity of the stock solution of luminol? 1.13M Before investigating the scene, the technician must ...
March 13, 2013

Physics 11
Sorry, I typed the equation wrong. This is the correct one. "Displacement is given by x=2+3t+4t². Find teh value of instantaneous acceleration." I still don't understand how to go about this. Thanks.
March 13, 2013

physics 11
Displacement i sgivenby x=2+3t+4t2. Find the value of instantaneous acceleration.
March 13, 2013

Life oriantation
Identify 5 practices in above case study that are in contravention of the basic condition of employment act
March 10, 2013

physics
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. As shown is the figure, a polar bear climbs onto a piece of ice, which has a volume of 5.75 m3, and is floating in sea water. a) What is the mass of the piece of ice? b) What is the mass of the ...
March 9, 2013

math
The cashier got 1/3 of the stamps and the secretary got 1/5 of the stamps. The secretary got 40 fewer stamps than the cashier. How many did the cashier receive?
March 8, 2013

Chemistry
Determine the boiling point of a solution contanting 36.1grams calcium chloride molar mass 112 in 200.0grams water.
March 7, 2013

Chemistry
The molal freezing point constant(Kf) for acetic acid is 3.90 C/m. When 31.5 grams of unknown solute is dissolved in 650 grams of acid the freezing point is lowered by 0.79 what is the molar mass
March 7, 2013

Chemistry
How many grams of NH4Br(Molar Mass=98g)are in 440.0 mL of 1.75Moles NH4Br
March 7, 2013

Chemistry
A Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was added to 9.00 mL ...
March 7, 2013

science
If you are titrating 25.00 mL of a 1.00mg/ml CaCO3 solution, how many mL of 0.010M EDTA solution will be required to reach the equivalence point
March 4, 2013

Physics
A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?
March 3, 2013

Physics
A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?
March 3, 2013

Physics
A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?
March 3, 2013

Basic Chemistry (Science)
Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and ...
March 3, 2013

chemistry
Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and ...
March 2, 2013

Honors Application
I am filling out an Honors application for English/History and one of the questions asked why do I wish to take this course.. any ideas? Thanks My ideas are: I want want to take this course because I want to take a class that is a bit more advanced than regular classes.
February 24, 2013

Biology
Answer
February 22, 2013

Biology
Please Help Quick,Write Out The Balanced Chemical Equation For Respiration In An Athlete In A Race.
February 22, 2013

Organic
Na2wo4 ---------------> H2o2 PTC khso4
February 21, 2013

Organic
Balanced reaction for cyclohexene to adipic acid. Used na2wo4 with h2o2, PTC, and khso4.
February 21, 2013

IST Subnetting
Please fill out the form below: Subnet Mask- Broadcast Address-
February 20, 2013

IST Subnetting
The question is to describe the subnetwork with the least amount of hosts to accommodate 100 computers, calculate the subnet mask and what is the broadcast address for this network.
February 20, 2013

IST Subnetting
You want to create a subnetwork of at least 100 computers. Currently your network is 172.21.0.0/16. Describe the subnetwork with the least amount of hosts that can accommodate 100 computers and calculate the subnet mask. What is the broadcast address for this network?
February 20, 2013

IST Subnetting
You have 5 subnets with approximately 300 hosts on each subnet. Within the next 6 months, the number of subnets could increase to more than 100. The number of hosts on each subnet will probably never be more than 2,000. You do not have any plans to connect to the Internet ...
February 20, 2013

Math
i just found out the answer should be that lilly has to redo her calculations because her calculations are off. core math
February 20, 2013

Math
there are no dividend or divisor. The question is exactly as written.
February 20, 2013

Math
Lily estimated a quotient of 120 and found an actual quotion of 83. What should she do next? Explain.
February 20, 2013

Earth Science
faunal successsion
February 20, 2013

7th Grade Math
5. Park Rangers wanted to estimate the total number of wild mustangs in Central Oregon. They tagged 30 wild mustangs and sent them back to the herd. They recorded the mustang population once a month for the next three months as shown below. Month 1 Month 2 Month 3 tagged ...
February 19, 2013

math
volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]
February 18, 2013

Trig
Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.
February 17, 2013

Trig
The diagonals of a parallelogram intersect at a 42◦ angle and have lengths of 12 and 7 cm. Find the lengths of the sides of the parallelogram. (Hint: The diagonals bisect each other.)
February 17, 2013

math
a ribbon is 45 cm long is cut into 2 pieces one piece is 4 times longer then the other find the length in cm of both ribbons
February 11, 2013

physics
charge A has a charge of 2C, Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of charge B and has a charge of -1C. if a fourth charge (charge D) is placed 4 meters to the right of charge B, how much charge must it ...
February 11, 2013

A2 Chemistry
This question is about the unnecessary production of carbon dioxide Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the combustion of ...
February 11, 2013

intro to physical science
the specific heat of granite is 0.80 KJ/kg . c. I f 1.6 MJ of heat are added to a 100-kg granite statue of James Precott Joule that is originally at 18 C, what is the finale temperature of the statue
February 11, 2013

intro to physical science
what is the Celsius equival of a temperature of 160 F
February 11, 2013

chemistry
How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?
February 7, 2013

chemistry
What is the volume in liters of a 0.760M K3PO4 solution containing 220.9g of potassium phosphate?
February 7, 2013

Physics
A person can jump a maximum horizontal distance (by using a 45 degree projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
February 7, 2013

Physics
A person can jump a maximum horizontal distance (by using a 45 percent projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
February 5, 2013

Physics
You are standing at the top of a cliff that has a stair step configuration. There is a vertical drop of 7 m at your feet, then a horizontal shelf of 8 m, then another drop of 3 m to the bottom of the canyon, which has a horizontal floor. You kick a rock, giving it an initial ...
February 5, 2013

Physics
A ball is thrown straight upward and returns to the thrower’s hand after 2 s in the air. A second ball is thrown at an angle of 38 degrees with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown ...
February 5, 2013

Physics
A boat must cross a 260-m-wide river and arrive at a point 110 upstream from where it starts. To do so, the pilot must head the boat at a 45 degree upstream angle. THe current has speed 2.3 m/s. a) What is the speed of the boat in still water? b) How much time does the journey...
February 5, 2013

Math
Thank you Ms. Sue. I put that down and it was correct.
February 4, 2013

Math
Ms. Sue could you help me with mt question I posted re interior and find exterior angle having to total 180 degrees I believe the answer would be 40 degrees
February 4, 2013

Math
Find x in triangle Exterior is 120 degrees and 20 degrees Find interior x 180 degrees total
February 4, 2013

Math
Okay , that makes sense .
January 29, 2013

Math
3/5 came from the probability of drawing White marbles. I am not sure about the (2/4)
January 29, 2013

Math
Can somebody help me solve this problem ? I am not so good with probability. - A bag contains 2 green marbles and 3 white marbles. One marble is drawn at random and not replaced. Then a second marble is drawn. What is the probability that the first marble is white and the ...
January 29, 2013

Chemistry
If 225.O grams of NO react with excess NH3,how many grams of H2O are produced
January 29, 2013

Chemistry
How many grams of N2 are produced when 15.0 moles of NH3 react with excess NO
January 29, 2013

Chemistry
how many moles of NO are needed to react with 15.0 moles of NH3
January 29, 2013

Chemistry
How many grams of HgBr2 can be produced if 10.0 grams of Hg reacts with 10 grams Br2
January 29, 2013

Chemistry
how many moles of sodium oxide are produced when 3.9 moles of of sodium combine with excess oxygen
January 29, 2013

Math - 8th Grade
I need help please. I answered (c)incorrectly. Chantal and Julia ride horses in the same race. Chantal's horse finishes in one minute and 59.53 seconds. If Julia's horse runs 2.25 percent slower than Chantal's, how long does it take Julia's horse to finish the ...
January 25, 2013

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