Sunday
December 21, 2014

Posts by mel


Total # Posts: 506

Chemistry
Thank you! I understand all except 2c. I did this way, is it true? M1V1= M2V2 M1= 15 M V1= ? M2= 1/100ml= 10/1000ml = 10 M V2= 100 ml And so I find V1= 67 ml .
December 4, 2014

Chemistry
My chemistry is bad. I know these are very easy but I cannot solve them . 1. a) Prepare 200 ml of 2 M HCl solution from stock bottle containing 37% w/w HCl and d = 1.2 (g/ml). MWHCl = 36.5 g b) Calculate M of 37% w/w HCl solution? d= 1.2, then solve the above problem 2. a) ...
December 4, 2014

Please help
I've done a decent job helping my daughter with this stuff, but it's been awhile since I was in school & just can't quite figure it all out.
November 11, 2014

7th grade math
Two step equations: Vincent started the year with $254 in his account at the health spa. Each time he uses the spa, $15 is taken out of the account. How many more times can he use the spa if he has already had $180 taken out of his account this year? I mostly just need to know...
November 11, 2014

Math 112
A student finds the value of square root of 3 on a calculator and says that this is the exact value of square root of 3 . How do you respond?
November 9, 2014

Statistics
Service times for customers at a post office follow some right-skewed distribution with mean 2.91 minutes and standard deviation 1.74 minutes. (a) Can you calculate the probability that the average service time for the next two customers is less than 2.64 minutes? If you can...
November 4, 2014

Statistics
haha im in your class and same name haha same question too
November 4, 2014

Statistics
Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.86 litres and standard deviation 0.29 litres. (a) Can you calculate the probability that the mean daily water intake for a random ...
November 4, 2014

Calculus
Find the value of a so that the tangent line to y = ln(x) at x = a is a line through the origin. I am unsure how to go about this.
October 19, 2014

Math
For f(x) = 2sinx + (sinx)^3 + tanx find f'(pi/3). Ok, so what I tried was... f'(x) = 2cosx + cosx(3(sinx)^2) + (sinx/cosx) pi/3 = (1/2, sqrt(3)/2) therefore, 2(1/2) + 1/2(3(sqrt(3)/2)(sqrt(3)/2) + (sqrt(3)/2 (2/1)) 1 + .5(3 (3/4)) + sqrt(3) 1 + .5(9/4) + sqrt(3) = 4....
October 19, 2014

Calculus
Ok thank you so much!
October 19, 2014

Physics
b.) A 33.3 N force is acting on a 285 kg slab. Determine the acceleration of the slab.
October 2, 2014

Math plz check if correct
B. negative The product of one positive and one negative term is negative. You could try it now, get a calculator and do any positive number times a negative number. Your result will always come out negative.
August 31, 2014

Math check see if i;m coorrect
Division has 4 parts: divisor, dividend, quotient and remainder. Since remainder is not an option, I would go with D. quotient.
August 31, 2014

Check this please?
Thank you guys.
August 31, 2014

Check this please?
I am writing about how different groups view the role of the government. I saw this online and wanted to use it to guide me through my essay, but wanted to check its accuracy because I thought Democrats weren't for higher taxes I thought Republicans were. Those in favor of...
August 31, 2014

Check my answers?
I am sorry to hear that, I hope things are well between you guys now. And thank you for checking my answers!
August 30, 2014

Check my answers?
Thank you. Also one more question was, Why did Washington and Nixon both believe that everyone was the loser in this situation? Now I wasn't too sure about this question but I responded with, We disliked both countries for years, and Washington said long ago that if you ...
August 30, 2014

Check my answers?
The passage: For decades, America has been locked in hostile confrontation with the two great Communist powers, the Soviet Union and the People’s Republic of China. We were engaged with the one at many points and almost totally isolated from the other, but our ...
August 30, 2014

Math
1 square mile
August 29, 2014

Check my answers?
Thank you!
August 29, 2014

Check my answers?
Ok my next guess was going to be C, because in my book it says how in 1981, Reagan he was cutting taxes, and in 1985, the nation was spending half a million dollars every minute on defense and these expenditures contributed to the growing budget deficits. But I wasn't sure...
August 29, 2014

Check my answers?
During the Reagan years, what happened to the overall course of the budget deficit? A. It rose. B. It fell. C. It increased by about $210 billion D. It increased, then fell back to its original level. I chose C. What was the major cause of deficit increases during the Reagan ...
August 29, 2014

History
Ok thanks again!
August 29, 2014

History
Thank you.
August 29, 2014

History
I already wrote about their economic and political structures I just want to make sure I didn't leave out any places they have settled.
August 29, 2014

History
Check my answer please I want to make sure I didn't leave something out, I was suppose to explain Spain, France, and England's settlements. In English colonies the earliest settlements were in Virginia and Massachusetts but soon spread all along the Atlantic coast, ...
August 29, 2014

History
Although settlers valued democracy, they often? A. rejected controls over government B. elected weak legislatures C. disregarded the rights of minorities D. failed to vote I chose D.
August 28, 2014

History
ok Thank you.
August 28, 2014

History
Is it because they're resistant to insecticides?
August 28, 2014

History
Why were crops such as Wheat and corn susceptible to insect pests?
August 28, 2014

History
Thank You.
August 28, 2014

History
I am sorry I did not mean to add the suburban areas. That came later on. Right now I have to focus on the waterfront cities and how new changes in transportation affected the location of the cities. My guess is because since they were by water, automobiles and streetcar lines ...
August 28, 2014

History
I don't know what they mean by this question. Because workplaces in the cities were clustered near the waterfront and homes were nearby so people could walk from home and work, and also goods and people could travel more easily and quickly over water than on land.
August 28, 2014

History
In suburban areas, the earliest cities were located on waterfronts. How might new changes in transportation affect the location of the cities. I know new transportation meaning automobiles, streetcar lines, etc.
August 28, 2014

Public Organization Management
Can someone read over my case paperI cannot add a file so i just copied and pasted it...I did not add my references at the end either or the tables since they wont show up right here just need to see if this makes sense and flows and my in paper citations are correct. ...
July 14, 2014

psychology
Rind, B., & Strohmetz, D. (1999). Effect on restaurant tipping of a helpful message written on the back of customers’ checks. Journal of Applied Psychology, 29, 139-144. doi:10.1111/j.15591816.1999.tb01378.x This is the article to use to answer these questions 1. What are...
July 6, 2014

psychology
Leigh, B. C. (1993). Alcohol consumption and sexual activity as reported with a diary technique. Journal of Abnormal Psychology, 102, 490-493. doi:10.1037/0021-843X.102.3.490 This is the article to utilize when answering the questions 1. What are the design elements (IV, DV)? ...
July 6, 2014

Psychology
Wookey, M. L., Graves, N. A., & Butler, J. C., (2009). Effects of a sexy appearance on perceived competence of women. The Journal of Social Psychology, 149, 116-118. doi:10.3200/SOCP.149.1.116-118 This is the article to use 1. What are the design elements (IV, DV) and ...
July 6, 2014

geography
Cam is correct!
May 22, 2014

BUSINESS RESEARCH
A data processing analyst for a research company finds that a preliminary computer run of survey results that his company conducted for a client show that consumers love the client's new product. Based on that information, the analyst buys a large block of the client's...
May 20, 2014

physics
What is the smallest size plane mirror a 184-cm {\rm cm}-tall person should buy to see himself if he mounts the mirror on a vertical wall?
April 1, 2014

phsyics
the coefficient of volume expansion for iron is 3.6 X 10^-5/C degrees. If a 17 m long rod of iron is cooled from 100 degrees C to 5 degrees C, What is the new length?
March 19, 2014

PHS 105
At a particular instant, two asteroids in inter-stellar space are a distance r = 20 km apart. Asteroid 2 has 10 times the mass of asteroid 1, m2 = 10 m1. 1. If the acceleration of the asteroid 1 toward the asteroid 2 is 1.0 m/s2 , what is the acceleration of the asteroid 2?
March 17, 2014

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.2 m/s and ax = +5.9 m/s2. The y components of the puck's initial velocity and acceleration are ...
February 5, 2014

Physics
After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 3.02 km away. Her dog runs ahead, at twice the speed, reaches the campground and turns around until it meets her again. Then, the dog proceeds to run back to the ...
February 3, 2014

Physics
You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground? (what are the formulas used?)
February 3, 2014

statistics
If the average commute time is 10.9 miles, but the average is actually the mean of a sample of 300 commuters and the sample standard deviation is 6.2 miles Estimate the true mean commute distance using 99% confidence level.
November 23, 2013

statistics
conduct a study on support of ban on smartphones in class. 68/87 said yes. How large of a sample is needed to be sure the margin of error +/- 3.5% with 99% confidence. I know this is estimation...but I am not sure how to go about solving this problem.
November 20, 2013

statistics
I am conducting a study on support of ban on smartphones in class. 68/87 said yes to the ban. How large of a sample is needed to be sure the margin of error +/- 3.5% with 99% confidence. I know this is estimation...but I am not sure how to go about solving this problem.
November 20, 2013

statistics
Calculate and interpret a 95% confidence interval for the mean bp in the pop of ALL anabolic-steroid using athletes: random sample of 9 athletes resulting in a sd of 207.8, and 109 respectively. When random sample is less than 30, don't I find a t score?
November 14, 2013

accounting 1
help with journalizing payroll transactions and filling on the cash payments journal, may 15, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. may 15, paid ...
October 14, 2013

accounting 1
help with journalizing payroll transactions and filling on the cash payments journal, may 15, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. may 15, paid ...
October 14, 2013

fundamentals of accounting 1
journalizing payroll transactions, for Keller Systems;Inc, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. paid cash for semimonthly payroll. total earnings...
October 14, 2013

Chemitry
if your smoke detector contains 0.10 mg of 241Am, how long will it take to decay 1.25 * 10^-2mg
September 29, 2013

math
3. Assume you have a fire truck that has a tank that is 60” X 70” X 57”. A. How many gallons of water will it hold?
September 27, 2013

carrer math
A standard basketball has a diameter of 9 9/16 inches (that is 9 inches and 9/16 of an inch). What is the volume of air in the basketball?
September 20, 2013

Math
Simplify. Remember to use absolute-value notation when necessary. If a root cannot be simplified, state this. 4ã(6a)^4
August 4, 2013

math
I am having a hard time on the ACT with the math have bought several books trying to learn the math and need some help please take the ACT sat. and again on the 23rd have to get good score to start classes in august
June 6, 2013

World Geography
Bobby Bob Robert is correct!
May 9, 2013

sociology
How have families changed over time and what relationship does this have to population structure? Provide an example on one social institution that has been affected by these shifts in family composition?
March 14, 2013

chem biochem bio
You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution??? 0.2M NaCl 0.05M Tris, pH...
March 10, 2013

math
If you have a class of 45 students and 15 are boys what is the percentage of boys in the class
January 29, 2013

math/hurry
there are 3 boys for every 4 girls.how many are boys in a class of 42?
January 10, 2013

math-calculus
Thank you! I initially thought the given rate of 12 cubic feet per minute was dr/dt.
December 17, 2012

math-calculus
A spherical party balloon is being inflated with helium pumped in at a rate of 12 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 1 ft?
December 17, 2012

math
jerrys planning a road trip. the scale on the map is 1 in = 150 miles. jerry has to go 8.3 in what is the distance jerry has to travel
December 10, 2012

sociology 101
which three of the most important sociological thinkers and use those ideas to explain the Senge, Hawken et al, and Kemmis readings
December 3, 2012

Physics
Find an expression in terms of M, mu, and theta for the speed of waves on the string.Express your answer in terms of the variables M, mu, theta, and appropriate constants. The picture shown is just of a block with mass m on an inclined frictionless surface at angle theta. the ...
November 27, 2012

physics
A shell is fired from the ground with an initial speed of 1.58 103 m/s at an initial angle of 31° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s
November 18, 2012

physics
A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.955 m (3.13 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?
November 18, 2012

Physics
A laptop computer requires 24 volts to operate properly. A transformer with 500 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?
November 5, 2012

Physics
A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 30.0 m due east. Path 2 is 200.0 m due south. Path 3 is 140.0 m 30.0° south of west. Path 4 is 170.0 m 60.0° north of west. At the end of the walk, what is the person&#...
November 1, 2012

Physics
A submarine dives 96 m at an angle of 24° below the horizontal. What are the two components? x = m y = m
November 1, 2012

Physics
A shopper pushes a cart 38 m south down one aisle and then turns 90.0° west and moves 25 m. He then makes another 90.0° turn and moves 17 m. (a) What is the largest possible displacement of the shopper? m ° counterclockwise from west (b) What is the smallest ...
November 1, 2012

Physics URGENT!!!
A massless spring of constant k =84.8 N/m is fixed on the left side of a level track. A block of mass m = 0.5 kg is pressed against the spring and compresses it a distance d, as in the figure below. The block (initially at rest) is then released and travels toward a circular ...
October 27, 2012

Physics HELP!
I'm not seeing any help in the related questions!
October 27, 2012

Physics HELP!
A toy race car starts from rest on a circular track of radius 4.30 m. The cars speed increases at the constant rate of 8.80 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, determine (a) the speed of the race car. b)the elapsed...
October 27, 2012

Physics- Elena please help!
Part of a roller-coaster ride involves coasting down an incline and entering a loop 30.0 m in diameter. For safety considerations, the roller coasters speed at the top of the loop must be such that the force of the seat on a rider is equal in magnitude to the rider’s ...
October 27, 2012

Physics HELP!
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
October 26, 2012

medical
Mr johnson is admitted to the hospital with chest and epigastic pain. he is evaluated by er department doctor with a diagnosis of rule out myocardial infraction. mr johnson is then transferred to a larger facility for further workup.... What is the ICD-9-CM code for this??
October 14, 2012

Physics
Two students are on a balcony 24.3 m above the street. One student throws a ball, b1, vertically downward at 15.8 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) ...
October 9, 2012

Physics
A peregrine falcon dives at a pigeon. The falcon starts downward from rest with free-fall acceleration. If the pigeon is 66.0 m below the initial position of the falcon, how long does the falcon take to reach the pigeon? Assume that the pigeon remains at rest
October 9, 2012

Chemistry
A sample of helium has a volume of 325mL and a pressure of 655mmHg. What wll be the pressure if the helium is compressed to 125mL (T constant)?
October 9, 2012

Physics
Can you help me solve this problem?
October 3, 2012

Physics
A sailboat starts from rest and accelerates at a rate of 0.18 m/s2 over a distance of 454 m. (a) Find the magnitude of the boat's final velocity. m/s (b) Find the time it takes the boat to travel this distance. s
October 3, 2012

Physics
Can somebody help me solve this?
October 3, 2012

Physics
An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be?
October 3, 2012

Physics
Can somebody help me solve this?
October 3, 2012

Physics
A boy sledding down a hill accelerates at 1.65 m/s2. If he started from rest, in what distance would he reach a speed of 7.30 m/s?
October 3, 2012

physics
can somebody help me solve this?
October 3, 2012

physics
A bus slows down uniformly from 50.9 km/h (14.1 m/s) to 0 km/h in 27 s. How far does it travel before stopping?
October 3, 2012

Physics
Runner A is initially 3.4 km west of a flagpole and is running with a constant velocity of 5.2 km/h due east. Runner B is initially 5.6 km east of the flagpole and is running with a constant velocity of 5.0 km/h due west. What will be the distance of the two runners from the ...
October 3, 2012

TRIG
find the degree measure of a central angle subtended by an arc of 8.00cm in a circle with circumference 20.0cm
October 2, 2012

Physics
A ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.0 m/s. After 0.2 seconds it is moving towards the paddle with a velocity of 3.5 m/s. What is the average acceleration in m/s2 during this time?
September 30, 2012

Physics
Approximately 4x10^9 kg of matter is converted into energy in the sun per second. Express the power output of the sun in watts.
September 27, 2012

accounting
1. Use the general journal to journalize the following transactions completed during July of the current year. 2. Post from the general journal to the general ledger. Using the following steps. a. A. Write the current year and July 1 in the Date column. (The account title, ...
September 25, 2012

Math
Can you tell me how you got this answer? I don't understand the example. I'm sorry. I'm not good at this.
September 23, 2012

Math
Determine if the following statement is true. For any numbers a and b, if a > B, then a2 > b2. Give a justification for your response. I'm so confused on this one too. I'm trying to find help in my book but cannot understand.
September 23, 2012

geometry
Let "p = I did my homework" and "q = i passed the exam". Write the statement p->q. Then find the inverse, converse, and contrapositive. I'm lost on how to do this.
September 23, 2012

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