Monday
October 20, 2014

Posts by Cynthia


Total # Posts: 516

Chemistry
when 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at a constant pressure and temperature, 78.0 kj of heat is given off. write a thermodynamic equation for this reaction.I don't know how to set up the equation i know that ...
October 16, 2014

physics
A ball starts from rest and rolls down a hill with uniform acceleration, traveling 200m during the second 4.8s of its motion. How far did it travel the first 4.8 seconds
September 16, 2014

math
An optometrist dilates a patient's pupils by a scale factor of 3. Should the patient's pupil enlarge or reduce?
September 4, 2014

Social Science - Science
Post a behavioral research situation that could use a Pearson coefficient and chi square research study. Present the rational for each selection.
July 25, 2014

chem
first you do n=m/M to get your moles then use you moles and the -3209.0 to geyt your kj then solve for the heat capacity by using the equation q=mct to rearrange to c=q/mt
July 13, 2014

chemistry
Calculate the volume that4.0mol of an ideal gas would occupy at 8.0 atmospheres pressure and 1700c (R=8.31mol-1k-1)
April 24, 2014

life orientation
Identify 3 study fields/paths in order of preference and provide two reasons for each choice
March 22, 2014

math
For a motor vehicle traveling at r miles per hour, the distance d in feet required to stop is approximately d=0.05r^2 + r. If a school bus is traveling at 45 mph, how many feet, to the nearest foot would it travel?
December 14, 2013

Help
No problem! Sometimes teachers are ambiguous at times but I am in early childhood education as well and were learning about screening and behavior, so I guess it would be D
November 29, 2013

Child care
What fundamental motor patterns do girls attain quicker than boys
October 11, 2013

statistics
the life spans of three randomly selected tires are 31,400 miles, 40,600 miles and 36,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
September 8, 2013

English 101
memo given in which there was no punctuation...only sentences. Please let me know if I have put the semicolon, etc in right place and if third shift should be hyphenated. Thanks!!! Our production plant has made the decision to run third shift and weekends to complete the line ...
June 21, 2013

English 101
Is this memo correct (semi-colon) in right sentence and time/date correct? Thanks! There were no punctuations at all when we were given this. We are going to make a few changes in the health plan we now offer; The Economy Plan and the Standard Plan—both of these will be ...
June 21, 2013

English 101
just wanted to make sure there should be a comma between one-level and brick. Also, three and two should be spelled out. There is one home that I think would meet your needs the best. This home is located at 8 Second Avenue; it is a one-level, brick home with three bedrooms ...
June 11, 2013

english
Is the following sentence correct? This home is located at 8 Second Avenue; it is a one-level brick home with three bedrooms and two baths.
June 11, 2013

algebra
(a1/2b)1/2(ab1/2) how to simplify expression and write with positive exponent
May 20, 2013

chemictry
how many gramms are in barium carbonate with 200g and 7.3% of hydrochloric solution
May 16, 2013

life orientation
providerecommendations on how to address the topic that you identified in the previous question.
May 5, 2013

math
8. At TelePower Plus, long-distance phone calls to China cost $0.59 for the first minute and $0.25 for each additional minute, plus an additional roaming charge of $2.50. If the total charge of a call to Beijing was $11.84, how many minutes did the call last? (Points : 2)
April 30, 2013

calculus
39x + 75y over the square root of 97 =650 how do I solve this?
April 25, 2013

business
an attempt to minimize the problem of wage-rate compression, organizations may incorporate all of the following ideas except: Answer giving larger increases to high-performance employees. preparing high-performance employees for promotion to high- salary jobs. providing ...
March 30, 2013

statistics3. Sick-leave records obtained from a ra
3. Sick-leave records obtained from a random sample of 200 social workers showed a mean number of days sick leave equal to 25.6 last year. If the sample standard deviation is 5.1, construct a 90% confidence interval for the mean number of days sick leave for all social workers...
March 29, 2013

chemistry
if a gallon of antifreeze weighs 8.75 pounds. what is the density of the antifreeze in g/ml?
March 3, 2013

math
a person deposits five hundred dollars in a savings account that pays 5% annual interest that is compounded yearly. At the end of ten years, how much money will be in the savings account?
February 18, 2013

statistics
A study found that 81% of households in the United States have computers. Of those 81%, 92% have Internet access. Find the probability that a U.S. household selected at random has a computer and has Internet access.
February 7, 2013

physics
in order to catch a fast moving softball with your bare hand doing this reduce the catching forcebecause the what
February 1, 2013

physics
a frieght train rolls at the same speed but has twice as much mass its momentum is
February 1, 2013

physics
find the impulse on a baqseball that is hit 80N of force in a time of 0.52 s
February 1, 2013

Physics
A 46.6 kg crate is at rest on a level floor, and te coefficient of kinetic friction is 0.32. The acceleration of gravity is 9.8M/s^2. If the crate is pushed horizontally with a force of 201.67 N, how far does it move in 3.42s? Answer in units of m
January 22, 2013

math
jordan has a bag that contains 246 marbles. there are 51 brown marbles and 195 gray marbles. estimate the percent of the brown marblesin the bag.
January 10, 2013

physics
What is k in the formula (3/2)kT
January 7, 2013

physics
What is k in the formula (3/2)kT
January 7, 2013

physics
What is k in the formula (3/2)kT
December 31, 2012

Please HELP with this storie problem
use a matrix
December 13, 2012

Algebra 2
thankss (:
December 13, 2012

Algebra 2
Simplify. (2-5i)-(3+4i)
December 13, 2012

Algebra 2
omg thank you soooo much (:
December 13, 2012

Algebra 2
thank you do you know how to do it though?
December 13, 2012

Algebra 2
The numbers iã5 and -iã5 are solutions to which equation? a. x^2+ã5=0 b. x^2+5=0 d. x^2-5=0
December 13, 2012

english
Can some check this for me thanks
December 10, 2012

english
1. A 2. B 3. D 4. D
December 10, 2012

english
1.Identify the reason for the comma(s) in the following sentence: When you have the opportunity to interview for a job, you can improve your chances for consideration by dressing for success. a.To join two independent clauses (along with a conjunction) b.To separate an ...
December 10, 2012

Math
Find the equation of the line that passes through the pair of points. Write your answer in slope-intercept form (2,-5)(2,-1)
December 8, 2012

chemistry
0.0386mol glucose in 88.0ml of solution
December 8, 2012

Psychology
How does biological and environmental factors shape our cognitive processes?
December 6, 2012

Psychology
How does one's cognitive processes shape some aspects of personality?
December 6, 2012

Finance
You own a portfolio that has $1500 invested in Stock A and $2,600 invested in Stock B. If the expected returns on these stocks are 11.1 percent and 16.7 percent, respectively, what is the expected return on the portfolio?
November 25, 2012

math
bill and ted combined age is 40. Eight years ago, bill was 2 years younger than ted is now. how old is bill now?
November 6, 2012

Calculus
1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the closed interval [0,1/2]. 2. Determine whether Rolle's Theorem applied to the function f(x)=x^2+6x+8 on the closed interval[-4,-2]. If Rolle's Theorem can be applied, find all values of c in the open ...
October 30, 2012

grammar - sentence structure
I was wondering if you could tell me if my sentence structure using ":" and quotations is correct... Furthermore, when Howard states: “If I had a spot, I'd slap you in” (54:14), and “everybody has to pull his own weight” (54:30), he uses the ...
October 26, 2012

Precalculus
A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The sides of each corral are attached to the barn and fencing is not needed along the back wall of the barn. If each corral is 30 ft. long (front to back...
October 8, 2012

Precalculus
A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The sides of each corral are attached to the barn and fencing is not needed along the back wall of the barn. If each corral is 30 ft. long (front to back...
October 8, 2012

geometry
what is the base length of a paralleogram whose area is 52 m squared and whose height is half is based lenghth
September 18, 2012

Physics
Trying to be on time for class, a girl moves at 2.4 m/s down a 52 m-long hallway, 1.2 m/s down a much more crowded hallway that is 79 m long, and the last 25 m to her class at 3.4 m/s. How long does it take her to reach her class?
September 18, 2012

simplify expression.
|7|+|-14|
September 17, 2012

math
81 boys and 81 girls
August 23, 2012

chemistry
_mg(OH)†? + _H2SO4._mgSO4 + _H2O
August 21, 2012

Trigonometry
Find the exact value of tan2(Beta) if sin(Beta) = 5/13 (Beta in Quadrant II)
August 12, 2012

Trigonometry
Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)
August 12, 2012

Calculus
Find the centroid of the area bounded by the parabola y = 4 - x^2 and the x-axis. A. (0,1.6) B. (0,1.7) C. (0,1.8) D. (0,1.9) Find the average value of the function i=15(1-3^-1/2t) from t=0 to t=4. A. 7.5(1+e^-2) B. 7.5(2+e^-2) C. 7.5(2-e^-2) D. 7.5(3-e^-2)
August 7, 2012

Calculus
evaluate (integral) xe^2x dx A. 1/6x^2 e^3x+C B. 1/2xe^2x-1/2e^2x+C C. 1/2xe^2x-1/4e^2x+C D. 1/2x^2-1/8e^4x+C Evaluate (integral) e^3x cosh 2x dx A. 1/2e^5x + 1/2e^x +C B. 1/10e^5x + 1/2e^x + C C. 1/4e^3x + 1/2x + C D. 1/10e^5x + 1/5x + C
August 7, 2012

Calculus
to evaluate (integral) 3x^2 cos (2x^3-4) dx, it is necessary to let A. u=3x^2 B. u=6x C. u=2x^3-4 D. u=6x^2
August 4, 2012

Calculus
Which of the following is a step in evaluating. (Integral) cos^2 5x dx A. (Integral) 1+cos10x/2 dx B. (Integral) 1-cos10x/2 dx C. (Integral) 1+cos10x/20 dx D. (Integral) 1-cos10x/20 dx
August 4, 2012

Calculus
Evaluate (integral) e^3x dx. A. e^3x + C B. 1/3e^3x + C C. e^4x + C D. 1/4e^4x + C
August 4, 2012

Calculus
Evaluate (Integral) sin 4x cos^2 4x dx. A. Cos^3(4x)/3 + C B. -Cos^3(4x)/3 + C C. Cos^3(4x)/12 + C D. -Cos^3(4x)/12 + C
August 4, 2012

Calculus
Evaluate (integral) cot 2x dx. A. 1/2Ln sin 2x+C B. 1/2Ln cos 2x+C C. 1/2Ln sec 2x+C D. 1/2LN csc 2x+C
August 4, 2012

science
how does the musculoskeletal system change from birth to adulthood to achieve 206 bones?
August 4, 2012

Trigonometry
Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)
August 3, 2012

Trigonometry
Prove that tan (Beta) sin (Beta) + cos (Beta) = sec (Beta) Please explain.
August 3, 2012

Trigonometry
Prove that tan^2(alpha)-1+cos^2(alpha)sin^2(alpha) Please Explain
August 3, 2012

Trigonometry
* Solve tan^2x + tanx-1=0 for the principal value(s) to two decimal places.
August 3, 2012

Trigonometry
Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two decimal places. Please Explain
August 3, 2012

Trigonometry
Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. Please explain.
August 3, 2012

algebra
find the total number of feet of wood needed if the trellis is 8 feet tall and 2 feet wide.
August 1, 2012

math
How to find the reciprocal of 5/3?
June 30, 2012

math
How do you find the reciprocal of 5/3
June 30, 2012

psychology 240
Factors that Determine What, When, and How Much We Eat, in the text, does your personal experience support these concepts? Why or why not? Provide examples
June 25, 2012

language
What's the noun and verb in seek his will in all you do and he will direct your path.
June 19, 2012

chemistry
A weather balloon if it starts with 10 liters of helium at 0km elevation and a temperature of 20 degrees. it is released and rises up through the atmosphere to an elevation of 12km where the temperature is -60degrees. calculate the volume of the helium at 12km.
June 3, 2012

Calculus
Use the given equation to answer the following questions. (Enter your answers from smallest to largest.) r = 8cos(¦È) 0 ¡Ü ¦È < ¦Ð (a) Find the points on the given curve where the tangent line is horizontal. theta= theta= (b...
June 1, 2012

Math
Carole earns 2.50 for each gadget she completes, what was her gross pay if she completed 145 gadgets last week.
May 27, 2012

Pre calculus
How do you work this problem? Find the exact value of sin 2u, cos 2u, and tan 2u given that cot u=3 and 180<u<270
May 14, 2012

health
Which age groups benefit from physical activity? A. Children B. Middle aged adults C. Older adults D. All of the above
April 24, 2012

MATH
What percentage of scores falls between +1 and +2 standard deviations?
April 3, 2012

health
What is a medical scientist,if you want to study medical science,what are the minimum requirements?and how can you briefly describe medical science?
March 15, 2012

Physics
A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.255. (a) When the truck accelerates forward, what force accelerates the box? A)the inertial force B)gravity C)centripetal force D)the friction force (b) Find the ...
March 8, 2012

Physics
A fire helicopter carries a 520-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant speed of 40.0 m/s, the cable makes an angle of 38.0° with respect to the vertical. Determine the force exerted by air resistance on the bucket.
March 8, 2012

Chemistry
A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....? A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP, with 0.163 M NaOH solution. She recorded an initial buret reading of 0.84 mL and a final buret ...
March 7, 2012

Chemistry
Determine the molarity of a sodium hydroxide solution? if 37.34 mL of it are required to neutralize 1.922 g of citric acid. balanced equation- 3NaOH(aq)+H3C6H5O7-->3H2O(l)+NaC6H5O7(aq… ***Plesae show steps.
March 7, 2012

Life orientation RAPHELA
ICASA AKA INDEPENDENT COMMUNICATION AUTHORITY OF SOUTH AFRICA
March 6, 2012

Life orientation
Explain three checks and balances that are in place in south africa that control and regulate the media
March 6, 2012

Chemistry
Zn metal was allowed to react with hydrochloric acid to produce hyrdogen gas.This gave a total of 555mL of gas collected over water at 20C and a pressure of 747mm of Hg. How many moles of hydrogen were collected? The vapor pressure of water at 20C is 18mm Hg.
March 5, 2012

Chemistry
How many liters of hydrogen gas can be made from 65.5g of magnesium at STP? Magnesium reacts to sulfric acid according to this equation... Mg+H2SO4-->MgSO4+H2
March 5, 2012

Chemistry
Using the van der Waals equation, determine the pressure of 436.0g of SO2(g) in a 7.30-L vessel at 725k.? For SO2(g), a=6.865L^2•atm/mol^2 and b=0.05679L/mol. (R=0.0821L•atm/(K•mol))
March 5, 2012

Chemistry
What how can I calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l)->2 KAl(OH)4 (aq) + 3 H2 (g) Please show steps ..
February 29, 2012

Chemistry
If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of potassium alum?
February 29, 2012

Chemistry
Calculate the percent yield of alum if you obtained 75.0 g of potassium alum from 5.00 g Al.
February 29, 2012

Chemistry
How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?
February 29, 2012

Chemistry
Which one ?
February 29, 2012

Chemistry
Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l)->2 KAl(OH)4 (aq) + 3 H2 (g)
February 29, 2012

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