Sunday

July 5, 2015

July 5, 2015

Total # Posts: 103

**Statistics**

A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=15.8 based on earlier studies?
*June 12, 2015*

**solution making/ chemistry/biotech**

You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 3.75 by dividing 750/20 but I am not sure
*February 23, 2015*

**chemistry **

one piece of copper metal at 105 C has twice the mass of another copper piece at 45 C. What is the final temperature if these two pieces are placed in a calorimeter. Specific heat of copper is 0.387 J/g.K.
*October 20, 2014*

**solution making/ chemistry/biotech**

so how would I find the percentage of that solution
*September 30, 2014*

**solution making/ chemistry/biotech**

how much of a .2M solution can you make with 340 g of calcium carbonate ( MW=100.0869) Do I multiply 340g by 1mole/MW
*September 30, 2014*

**math**

A bicyclist rides off a roof at 15.2 \frac{m}{s}. The roof is 9.8 m above the ground. How far from the edge of the building does the bicyclist land? Use SI units in the second box.
*September 15, 2014*

**math**

A train is going directly South at 60 mph. An action-movie star is atop the train, running North at 6 mph. Relative to someone standing on the ground, how fast is the action-movie star moving, and in what direction? North is positive and South is negative. Use SI units in your...
*September 15, 2014*

**math**

You fire your potato gun horizontally from shoulder height, which is 190 cm above the ground. The potato strikes the ground 30 m away from you. What was the initial speed of the potato?
*September 15, 2014*

**math**

Sue stacked one box onto another. The bottom box had the height of 2 1/3 feet and the top box had the height of 3 2/3 feet. How tall were the stacked boxes?
*June 19, 2014*

**Physics**

A small block with a mass of m = 0.120 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.40 m from the hole with a speed of 0.70 m/s. The cord is pulled from below, shortening the radius ...
*May 20, 2014*

**Physics**

A force of 800 N stretches a spring a distance 0.200 m horizontally. a) What is the potential energy of the spring when it is stretched 0.200m b) What is its potential energy when it is compressed 5.00cm This is a conservation of energy problems. The potential is elastic and ...
*May 20, 2014*

**Chemistry**

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.640. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I need to know what equations to use to find the answer not just how to get it
*February 23, 2014*

**Chemistry**

replace the 7.77 with 9.23 answer in end in 5.20 x 10^-6
*February 20, 2014*

**Chemistry**

Pb(NO3)2 => Pb2+ + 2 NO3- [Pb2+] = [Pb(NO3)2] = 7.77 mM = 7.77 x 10-3 M Pb(IO3)2 <=> Pb2+ + 2 IO3- Ksp = [Pb2+][IO3-]2 = 2.5 x 10-13 7.77 x 10-3 x [IO3-]2 = 2.5 x 10-13 [IO3-] = 5.67 x 10-6 M ˜ 5.7 x 10-6 M
*February 20, 2014*

**Chemistry**

Calculate the concentration of IO3– in a 9.23 mM Pb(NO3)2 solution saturated with Pb(IO3)2. The Ksp of Pb(IO3)2 is 2.5 × 10-13. Assume that Pb(IO3)2 is a negligible source of Pb2 compared to Pb(NO3)2.
*February 20, 2014*

**ashford unversity**

Which of the following is true regarding an SEP?
*May 20, 2013*

**chemsitry**

you start with 150.0g of pentane and 500.0L of O2. how many grams of H2O will you make?
*March 29, 2013*

**math**

winnie has 7 trophies she wants to display in arrays. how many different arrays are possible? explain.
*February 5, 2013*

**AP Chem**

The electron-domain geometry and molecular geometry of iodine trichloride are __________ and __________, respectively. The answer is trigonal bipyramidal, T-shaped, respectively- I do not understand the approach PLEASE EXPLAIN HOW YOU GOT THE ANSWER!!!
*January 29, 2013*

**AP Chem please help!**

i don't understand how you got that though? That is the answer though.
*January 29, 2013*

**AP Chem please help!**

The electron-domain geometry and molecular geometry of iodine trichloride are __________ and __________, respectively. The answer is trigonal bipyramidal, T-shaped, respectively- I do not understand the approach
*January 29, 2013*

**AP Chemistry- PLEASE HELP**

The electron-domain geometry and molecular geometry of iodine trichloride are __________ and __________, respectively.
*January 29, 2013*

**chemistry**

a container has the dimensions of 2.5 m x50 cm x60 mm. It is filled with water at 0.0 degrees celsius,how many kilocalories will be necessary to heat the water to boiling point?
*January 20, 2013*

**Geometry**

Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length of wrought iron used to make the structure. Round the answer to the nearest meter.
*January 14, 2013*

**CIS/Visual Logic**

Design an application that accepts 10 numbers and displays them in descending order. Us an array to store the numbers and Bubble Sort to sort the numbers.
*November 25, 2012*

**Algebra 106**

Steve, if compounded monthly for 10 yeays how do i calculate it
*November 10, 2012*

**Algebra 106**

$625.00 investested in retirement fund for 10 years @ 3.84% compounded
*November 10, 2012*

**Program Logic Design**

create a flowchart that shows the logic for a program that generates a random number; then ask the user to think of a number between 1 and 10. The display then randomly generated number so the user can see whether his or her guess was accurate.
*October 19, 2012*

**Math**

If I make a porch that is 60 feet in length, 50 feet wide and 4 inches deep, how do I calculate the area, perimeter, and surface area of the porch? Can I multiply feet and inches in the same equation?
*October 15, 2012*

**CIS**

Draw a flowchart or write pseudocode to represent the logic of a program that allows the user to enter a value. The program multiplies the value by 10 and outputs the result.
*October 11, 2012*

**Order of Operations**

8+6(7-4)/9 7-4=3 8+6*3/9 8+18/9 8+2=10 Your answer is 10
*September 11, 2012*

**Math 8R**

Because integers are negative or positive whole numbers they can never be rational or irrational numbers.
*September 11, 2012*

**Economics**

The company estimates the probability of no damage to be 0.60, the probability of damage between $0 and $10,000 to be 0.25, and the probability of damage between $10,000 and $25,000 to be 0.12. If the company wants to make a profit of $200 above the expected cost, what should...
*July 1, 2012*

**math**

what is the stopping distance for a car traveling at 40 mph
*May 2, 2012*

**univ/com/155**

write a paragraph of instructions on the writing process for future com/155 students.include the steps in the writing process.
*April 26, 2012*

**Algebra 2**

What is the angular speed in radians per second of the hour hand of a clock? If the hand is 5cm long, how fast is the tip moving in millimeters per second?
*April 22, 2012*

**Humanities/World Literature**

1.Why does the demon collect her lovers' rings in _1001 Nights_? 2.What is the purpose of Shahryar and Shahzaman's journey in _1001 Nights_?
*March 4, 2012*

**Humanities/World Literature**

Why, according to the Quran, does God cause Israel to wander the desert for 40 years?
*March 4, 2012*

**U.S HISTORY**

How did World War II affect American sensibilities including the way Americans viewed the war and themselves?
*January 17, 2012*

**Business management quest**

A college professor told her students, “The purpose of a management course is to teach students about management, not to teach them to be managers.” Do you agree or disagree with this statement? Why or Why not? Also, is efficiency and effectiveness more important to ...
*December 3, 2011*

**chemistry**

How many grams of NaOh are required to neutralize 15.0mL 0f 0.85M HCl. Show calculations please
*November 11, 2011*

**chemistry**

Sorryy but I still don't understand will you show the calculations for my previous question
*November 11, 2011*

**chemistry**

Thanks alot! So Ma x Va= Mb x Vb or Ma=MbVb/Va :)
*November 11, 2011*

**chemistry**

how many mL of 0.15 M NaOH solution are required to neutralize 35.00 mL of 0.22 M HCl
*November 11, 2011*

**math**

What is
*September 1, 2011*

**Physics**

A horizontal pipe narrows from a diameter of 10 to 5 cm. For an incompressible fluid flowing from the larger diameter to the smaller: Question 5 options: 1.the velocity and pressure both increase. 2.the velocity increases and the pressure decreases. 3.the velocity decreases ...
*August 10, 2011*

**Physics _ Please please help**

I got 25.5 for the (I) one Could you help me with the (II) and (III)
*August 10, 2011*

**Physics _ Please please help**

The cross-sectional area of the U-tube shown below is uniform and is equal to one square centimeter (1.00cm^2). One end is open to the atmosphere. Atmosphere pressure may be taken as P1=1.01 * 10^5 Pa. The other end of the U-tube is connected to a pipe in which a constant gas ...
*August 10, 2011*

**Physics _ College**

A 50 cm long hollow glass cylinder is open at both ends and is suspended in air. A source of sounds that produces a pure frequency is placed close to one end of the tube. The frequency is placed close to one end of the tube. The frequency of the sound source is slowly ...
*August 10, 2011*

**physics 3U**

An arrow is accelerated for a displacement of 75cm [fwd] while it is on the bow. If the arrow leaves the bow at a velocity of 75m/s [fwd], what is the average acceleration while on the bow?
*July 6, 2011*

**A and P**

The following is a template strand of DNA with a start codon(=!!!) and a stop codon(=???): !!!TCGGGCTACAAAACAAATCAACGGGGCTCGCAAACAAATAAACGG??? What is its mRNA nucleotide sequence? Indicate the product of this DNA segment/gene. What is the product’s primary structure? How...
*June 10, 2011*

**algebra**

Determine whether each pair of equations represents parallel lines 3x=5y-2 and 10y=4-6x
*June 9, 2011*

**Literature**

What literature do you consider to be part of the United States' current literary canon, and why? How do those selections reflect the cultural tradition of the United States? What do you consider to be part of your personal literary canon?
*April 3, 2011*

**Chemistry**

Determinne the amount of Dextrose and NaCl in 500ml of 5% DNS. (The solution is 5% in regards to dextrose and 0.9% in regards to NACl.)
*March 14, 2011*

**Math**

yes thanks
*February 16, 2011*

**Math**

In solving the eqaution(x+4)(x-4),Eric stated thatthe solution would be x+4=33=>x=29 or (x-4)=33=>x=37 However, at least one of these solutions fails to work when substituted back into the original eqaution. Why is that?Help Eric to understand better,solve the problem ...
*February 16, 2011*

**Chemistry**

Calculate the molarity of an aqueous NaOH soultion if 32.00ml of it is required to titrate. 0.6789 g of oxalic acid to phenolphthalein end point. The balanced chemical equation is H2C2O4 + 2NaOH-> Na2C2O4 + 2H2O
*December 6, 2010*

**algebra 2**

anyoneee?
*November 30, 2010*

**algebra 2**

3. Identify the range of y=|x|-4 A. [x|x≥4] B. [y|y≥-4] C. [y|y≥0] D. all real numbers I'm confused about this question, any help???
*November 30, 2010*

**algebra 2**

thanks!
*November 30, 2010*

**algebra 2**

Find the x-intercept and the y-intercept of the graph of: 4x-2y=8 a. (2, -4) b. -4;2 c. (4, -2) d. 2;-4 I'm stuck between a and d. anyone helpp?
*November 30, 2010*

**algebra**

I'm confused now, your saying it's d now?
*November 30, 2010*

**algebra**

so it's choice A? yeah i agree with you, I didn't know which one to choose, made it more confusing.
*November 30, 2010*

**algebra**

Find the x-intercept and the y-intercept of the graph of: 4x-2y=8 a. (2, -4) b. -4;2 c. (4, -2) d. 2;-4 I'm stuck between a and d. anyone helpp?
*November 30, 2010*

**physics**

A 400 calorie quantitiy of heat is added to 20 grams of water and as a result, the water reaches a final temp of 70 deg. C. The starting temp of the water was most nearly _____ deg C.
*November 12, 2010*

**physics**

A 5 kg block of average density .625 kg/m^3 has a volume of about _____ cu. m
*November 12, 2010*

**physics**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant
*November 12, 2010*

**physics**

Graph #1 is a parabola. Graph #2 is a hyperbola. a. Only graph 1 may possibly represent Hooke's law b. Only graph 2 may possibly represent Hooke's law c. neither
*November 12, 2010*

**Chemistry**

calculate the theoretical yield (in grams) of the solid product, assuming that you use 1.0 g FeC2O4×2H2O and that oxygen is the excess reactant. FeC2O4×2H2O (s) + O2(g) ---> FeO(s) + H2O(g) + CO2(g) Its balanced equation is 2FeC2O4×2H2O (s) + O2(g)---->...
*October 14, 2010*

**english**

describe your experience with credit card in a brief paragraph using 5 adverb and 5 adjective
*September 22, 2010*

**umuc**

sample of 80 people randomly asked in casino shows that average lost per person is $160 with a sample standard deviation s=$40. Based on this data create a 95% confidence interval for population mean.
*July 18, 2010*

**math**

Please explain how to get the answer. At the animal shelter, 1/3 of the animals are dogs, 2/12 are cats, and 19 are other animals. How many animals are at the shelter? I said 1/3x + 2/12x + 19 = 4/12x + 2/12x = 19= 6/12x = 19 1/2x = 19 x =
*May 13, 2010*

**Genetics/Biology**

That doesn't help.
*March 18, 2010*

**Genetics/Biology**

Recombination frequencies a. arise from completely random genetic exchange. b. are the same for all genes. c. decrease with distance. d. are the same for cis and trans heterozygotes.
*March 18, 2010*

**math214**

Joe’s baseball team sold 200 chances to win a $250 set of golf clubs. What is the expected value of a single chance if only one chance wins?
*March 9, 2010*

**poetry**

i need to write an acrostic poem for english using the quote:"do all lawyers defend negros". its from to kill a mocking bird and i need to write a phras starting with each letter in the quote and i cnt think of anything
*January 12, 2010*

**Math**

1) If you have an inhomogeneous, linear equation like f''(x) + f'(x) + f = x you can find the general solution by finding a particular solution (with no constants of integration)to this equation and adding it to the general solution to the homogeneous equation f&#...
*September 19, 2009*

**Physics**

A spaceship approaches Starbase Beta with an initial velocity moving in the +x direction. The ensign sets the ship’s computer to initiate a braking program starting at time t = 0. After this time the computer controls the ship’s x-velocity according to until the ship...
*September 19, 2009*

**Physics**

(a)A car travels exactly once around a circle of radius 5.0 m at constant speed of 3.0 m/s. What is the car’s average velocity (magnitude and direction) during this interval? Explain/justify. (b)Repeat the calculation of average velocity if the car travels halfway around ...
*September 19, 2009*

**Physics**

A car is traveling over the top of a hill, which we will model to be a piece of a circular arc of radius R. For each case below, draw careful to-scale motion maps and use them to construct the velocity vectors at the following three points: the top of the hill; equal time ...
*September 19, 2009*

**History**

Compare the European settlements in the Chesapeake area and New England in terms of goals, governments, social structures, and religions. What similarities do you find most remarkable? What differences do you find interesting? information please
*May 2, 2009*

**History**

Can you tell me were, I can find information.
*April 28, 2009*

**History**

Historians often encounter difficulties when researching and interpreting the past. How does this influence the way people view history?
*April 28, 2009*

**Arithmetic**

How can we put parentheses around the following expression so that the answer is 105? 9 + 8 x 7 - 6 x 5 + 4 x 3 + 2
*November 18, 2008*

**Algebra1**

when using multiplying by 1 to find an expression equivalent to 18/7 with a denominator of 28x, the equivalent expression that I get is 4x/28x and i am being told that that's wrong
*July 25, 2008*

**algebra**

I am given the perimeter of the rectangle. It is 96cm. The length is 3 times the width. What are the measurements of the 4 sides of the rectangle? I need the formula please.The answer is 12 and 36, I think.
*May 5, 2008*

**Math -please check me**

what is the perimeter of a rectangle if the length is 5/9 cm and the width is 2/9 cm? a. 5/9 cm b. 1 5/9cm c. 7/9 cm d. 1 7/9 cm the answer I got was 14/9 please help me.
*March 28, 2008*

**Math - please double check me**

There are 42 accounting classes with 31 students in each class. Estimate the total number of students in the accounting classes. a. 1200 b. 900 c. 1600 d. 1500 answer: c One kilometer is equal to 1000 meters. What fractional part of a kilometer is 500 meters? Simply your ...
*March 28, 2008*

**Math- help please**

what is the greatest common factor of 245, 385, and 539
*March 27, 2008*

**Math**

Please help Which of the following numbers are integers 2/3, 35, 0.093, -650, 42.5 Determine the maximum and minimum values of the following set of numbers 3. -36/7, -1, -2/3, 5/4, -5, 26/9
*March 22, 2008*

**Accounting 11**

What all goes on cash flow statement using an indirect method? How would it show on the sheet?
*February 24, 2008*

**Accounting 11**

I need help completing a statement of cash flow using the indirect method.
*February 24, 2008*

**Math**

I need help please A computer can execute 64 instructions per second. How many instructions can it execute in 10 minutes? Multiply 3 1/6 x 9/11 x 6/17. Write the answer in simplest form Divide 6/25 / 2/15. Write the result in simplest form.
*February 9, 2008*

**math**

simple form 3 ¾ / 60,000= 41 ½ / 3 ¾ A computer can excute 36 instructions per microscecond. How many instructions can it execute in 4 min?
*February 5, 2008*

**math**

x^3-4x-2 [2,3] we have to use the intermediate value thereom. not sure how to do this.
*January 24, 2008*

**Communication**

Identify a source of miscommunication with which you are familar. How can this type of miscommunication be effectively addressed or completely avoided?
*December 11, 2007*

**Communication Stratgies**

How can you write a 350 word memo about 25 students losing their deposit on a spring trip?
*November 25, 2007*

**Communication strategies**

The trip for mexico during spring break has been cancelled due to the bankruptcy of the bus company. You must tell 25 of your classmates that the trip has been cancelled and that they have lost their $100 deposit.
*November 25, 2007*

**alegbra**

(2a+4b)-(3a-b)when and how do u know to change the signs? It might help to think of it as below. (2a+4b)-1(3a-b) Mutliply the last term by the -1. 2a+4b-3a+b = -a+5b or 5b-a I hope this helps. Thanks for asking.
*April 17, 2007*