Monday

February 20, 2017
Total # Posts: 2,677

**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 don't 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 the 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**

17 miles

*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*

**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*

**Science**

The intensity of an earthquake wave passing through the Earth is measured to be 1.5×10^6 J/m^2*s at a distance of 58km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area of 3.0 m^2 at 2...

*January 25, 2013*

**math**

are you sure this is right

*January 23, 2013*

**pre- algebra**

i put b i got it rong and it cant be c so its either a or d i think a

*January 22, 2013*

**pre- algebra**

Write a rule for the linear function in the table. x f(x) 1 3 2 2 3 1 4 0 A. f(x) = 4x B. f(x) = x – 4 C. f(x) = x + 4 D. f(x) = 4 – x

*January 22, 2013*

**chemistry**

What would be the concentration of dinitrogen pentoxide after 6.00 X 10(2) seconds and how long would it take for the concentration of N2O2 to decrease to 10.0% of its initial value in the following equation... N2O5 to NO2 and O2 initial concentration is 1.65 X 10-2mol/L rate ...

*January 21, 2013*

**Chemistry**

This problem is 1st order for half life. How long would it take for the concentration of cyclopropane to decrease to 50% of its initial value? to 25% of its initial value? Rate constant is 9.2/s I set up like this... t1/2= 0.693/9.2/s= 0.075s at 50% I can't figure out how ...

*January 21, 2013*

**Chemistry**

So, to solve for t would I set up the problem like this... ln (0.00124/0.0165)=4.80 X 10-4 X t?

*January 20, 2013*

**Chemistry**

What would be the concentration of dinitrogen pentoxide after 6.00 X 10(2) seconds and how long would it take for the concentration of N2O2 to decrease to 10.0% of its initial value in the following equation... N2O5 to NO2 and O2 initial concentration is 1.65 X 10-2mol/L rate ...

*January 20, 2013*

**Chm**

What is the molarity of a saturated solution of potassium sulfate if the solubility is 13 g per 100 g H2O at 25°C? The density of the solution is 1.1 g/mL

*January 17, 2013*

**world civilization**

What motivated western Europeans to explore and colonize in the wider world?

*January 14, 2013*

**assembler language**

write an assembly language subordinate count according to these specs: accepts a pointer to an array or signed words in register X. Accepts a word value in register Y, which indicates the number of array elementsl Returns the number (i.e. count) of nonzero array elements in ...

*January 12, 2013*