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March 29, 2017

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Posts by Lynn

Total # Posts: 592

Chemistry
What is the hydrogen ion concentration of a 0.22 M hypochlorous acid solution with Ka = 3.5E-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq) = H+(aq) + OCl-(aq). I keep getting 3.60 as the concentration, but that is the wrong answer. Using ICE: Eq: HOCl...
March 29, 2017

Chem
A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate (with the fillers removed). The solid ...
March 8, 2017

Chemistry
So far i have done the following: Ln of (concentration A divided by Concentration A at time 0) = -k * T natural log (0.0174 M / 0.0693 M) / -489 sec which equals to 2.826 x10^-3 s-1
February 24, 2017

Chemistry
Hydrogen iodide decomposition via a second-order process to produce hydrogen and iodine according to the following chemical equation: 2 HI(g) -> H2 (g) + I2 (g) If it takes 489 seconds for the initial concentration of HI to decrease from 0.0693 M to 0.0174 M, what is the ...
February 24, 2017

history
What was the last christian city conquered by the Muslims.
February 23, 2017

Chemistry
Is calculating the sloope of the tangent line the same as calculating the slope? (y2-y1) / (x2/x1) for instance if i took the points 60, 0.023 for X1Y1 and points 100, 0.034 for X2Y2, the slope of the line would be : (0.034-0.023) / (100-60) = 0.011/40 = 0.000275 (the slope...
February 21, 2017

Chemistry
Using the following data, determine the initial rate by calculating the slope of the tangent line at time zero. Time (s). [I2] (mM) 0. 0 20. 0.009 40. 0.017 60. 0.023 80. 0.029 100. 0.034 120. 0.039 140. 0.043 160. 0.046 180. 0.049 I can't figure out how to make a tangent...
February 21, 2017

Math
Jenny's lawn is 1/3 of an acre. After moving 1/2 of the lawn, how much of an acre has she mowed? A. 1/5 B. 1/6 C. 1/2 D. 2/5 ______________________________ A leaking bucket is filled to 3/4 capacity. After some time, 1/2 of the water has leaked out. What fraction of the ...
December 31, 2016

Algebra
After thinking about it, two negatives cancel out to be neutral so the answer is D. No need for any feedback now.
December 8, 2016

Algebra
A line has slope -5/3. Through which two points could this line pass? A: (12,13), (17,10) B: (16,15), (13,10)*** C: (0,7), (3,10) D: (11,13), (8,18)*** My Explanation: I know how to use the formula for slope, which is y2 -y1 over x2 - y2, so I know how to solve the problem. ...
December 8, 2016

Trig
Find the exact value of the trigonometric function given that sin u=3/5 and cos v=-8/17. Both u and v are in quadrant II. Tan (u+v)
November 14, 2016

Math
Solve this equation for x. ab+c/xy = 3d/4 How do you solve this? Please help.
November 3, 2016

Math
Sarah has to go to her brother's baseball tournament that lasts for 4 days. She eats two-thirds of a hotdog at every game. He plays 2 games a day. Define your variables, write a function rule, find the domain and range, and tell whether the data is discrete of continuous. ...
October 2, 2016

Math
The number is closer to 60 than to 70. It is one number closer to65 than 68 is.
September 21, 2016

Biostatstics
Question: The New York State Health Department reports a 10% rate of the HIV virus for the “at-risk” population. Under certain conditions, a preliminary screening test for the HIV virus is correct 95% of the time. (Subjects are not told that they are HIV infected ...
September 18, 2016

Financial math
Janet Woo decided to retire to Florida in 5 years. What amount should Janet invest today so she can withdraw $45,000 at the end of each year for 20 years after she retires? Assume Janet can invest money at 5% compounded annually.
June 29, 2016

Maths
Both of the digits is even. One of the digit is 4. The tens place is twice the amount of the ones place. The number is less than 70. What is the number?
June 3, 2016

Math
I have a square house that has 1130 square feet, what is the dimension?
May 29, 2016

algebra Please c if this is right?
Mrs. /green is randomly choosing team captains from her class of 12 girls and 10 boys. ?She draw one name from the bag, SETS IT ASIDE, and then chooses a second name. /What is the probability that both team captains are girls? I would say it is 2/7 Can someone check to see if ...
May 23, 2016

english
Paint
April 25, 2016

Math
Thanks Damon.
April 10, 2016

Math
Is this correct? Divide the reciprocal of -9 by the opposite of -9. This is my answer -9/1 / -9 -1/9 / 9 -1/9 * 1/9 = -1/81
April 10, 2016

Math
Thank you.
April 10, 2016

Math
I need help. Solve the proportion: 4:x :: -3/8:12
April 10, 2016

math
The Jacobys went on a 600-mile trip. On the first day they drove 5 3/4 hours and on the second day they drove 4 3/4 hours. How many hours did they drive during the first two days?
March 6, 2016

Math
11.5
December 9, 2015

Algebra 1 help
Christine is correct! I was struggling for the answer on question 2. Thank you!
December 9, 2015

6th grade algebra
what expression represents a number n divided by eight increased by five? n/8+5 is this correct?
November 17, 2015

economics
Think about how each scenario would affect the price of khaki pants. a.A new technology reduces the time it takes to make a pair of khaki pants. b.The price of the cloth used to make khaki pants falls. c.The wage rate paid to garment workers increases. d.The price of jeans ...
October 18, 2015

English
All these sentences look right to me. Which is incorrect? Identify the incorrect sentence. A. The jury has been deliberating for the past three hours. B. Members of the jury have been deliberating for the past three hours. C. The jury is arguing over the evidence. D. Members ...
July 23, 2015

math
Explain why an even function does not have an inverse that is a function. and if log b < 0, what can you say about b?
July 13, 2015

Maths
Find the first four terms in the binomial expansion of (1+x)^(1/5) and state the range of values of x for which this expansion is valid.Hence approximate (31)^(1/5) correct to four decimal places.
July 8, 2015

Maths
Find the first four terms in the binomial expansion of (1+x)^(1/5) and state the range of values of x for which this expansion is valid.Hence approximate (31)^(1/5) correct to four decimal places.
July 7, 2015

Maths
A ball is dropped from a height of 80ft.The elasticity of this ball is such that it rebounds three-fourths of the distance it has fallen. How high does the ball rebound on the fifth bounce? Find a formula for the height the ball rebounds on the nth bounce?
July 7, 2015

Physics
A stone is thrown upwards from the roof with a velocity 15ms^-1 at an angle 30degree to the horizontal. The height of the building is 40m.calculate the magnitude of the velocity of the stones before it strikes the ground
July 4, 2015

Physics
A particle moving with uniform acceleration has initial velocity u. With the aid of a velocity time graph, show that the displacement s after time t is given by: s=ut+1/2*gt^2
July 4, 2015

HELP!! Statistics!
The accompanying data table lists measured voltage amounts supplied directly to a family’s home. The power supply company states that it has a target power supply of 120 volts. Using these home voltage amounts, test the claim that the mean is 120 volts. Use a 0.05 ...
June 3, 2015

INTERVAL OF THE MEAN
In a test of of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured beforeandafter the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 5.4 and a sd of 17.5. ...
May 26, 2015

Statistics HELP!
Use a normal approximation to find the probability of the indicated number of voters. In this case assume that 119 eligible voters aged 18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged 18-24, 22% of them voted. The probability that ...
May 18, 2015

Statistics
If np ≥ 5 and nq ≥ 5, estimate P (fewer than 4) with n = 13 and p = 0.5 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq <5, then state that the normal approximation is not suitable. P (fewer than 4) =
May 17, 2015

trig
Find the bearing and airspeed for a plane to fly 630 miles due north in 3 hours if the wind is blowing from a direction of 318* and is blowing at 15mph. Approximate the bearing to the nearest degree and the speed to the nearest mile per hour.
April 28, 2015

Algebra 1
x/2=10+ 2y/3
April 16, 2015

Chemistry
23°C
April 9, 2015

Math- Calc 1
1. At what point does the normal line to the curve x^2 - XY + Y^2 = 3 at the point (-1,1) intersect the curve again? 2. Find the constants A, B so that if Y=A*sin X + B cos X, then Y satisfies the differential equation Y" + 2Y = 0. 3. Find the points on he graph of Y = e^...
February 25, 2015

Math- Calc 1
1. At what point does the normal line to the curve x^2 - XY + Y^2 = 3 at the point (1,1) intersect the curve again? 2. Find the constants A, B so that if Y = Asin X = B cos X, then Y satisfies the differential equation Y" + 2Y = 0. 3. Find the points om he graph of Y - e^...
February 24, 2015

algebra
An alligator’s tail length, T, varies directly as its body length, B. An alligator with a body length of 4.5 feet has a tail length of 2.5 feet. What is the tail length of an alligator whose body length is 5.4 feet?
February 8, 2015

psycholigy
Cultural learning involves all aspects of the learning processes that psychologists have identified over the years, such include: a. classical conditioning b. operant conditioning c. social learning d. All of the above.
December 14, 2014

Chemistry honors
20 grams magnesium metal react with excess oxygen and 28 grams of magnesium oxide are produced in lab what is percent yield? If 99.8 g of aluminum nitrate are reacted with excess sulfuric acid what would be the theoretical yield in grams of aluminum sulfate? i have done both ...
December 4, 2014

Physics
a (n) 1510 kg car is moving along a level road at 13.8 m/s. The driver accelerates and in the next 10s the engine provides 23400 J of additional energy. If 3900 J of this energy must be used to overcome friction, what is the final speed of the car?
November 7, 2014

Algebra
Ticket Sales. Stacey is selling tickets to the school play. The tickets are $7 for adults and $4 for children. She sells twice as many adult tickets as children's tickets and brings in a total of $306. How many of each kind of ticket did she sell?
November 5, 2014

Math
Sara wants to put new carpet. She needs 20 square feet. the carpet was $4.00 a square foot. She got it for half price. What was the new cost of the carpeting? And the total?
October 24, 2014

Stats
A random sample of 100 GMAT scores has a mean of 500. Assume that GMAT scores have a population standard deviation of 120. Construct a 95% confidence interval estimate of the mean GMAT scores. (15 pts) What is the sample size for the conference interval? What is the point ...
October 12, 2014

medical coding2
does anyone know the answer the this coding question? This 42 Year Old White Male Who Accidentally Injured His Left Finger On A Circular Saw While Working O At Home In His Garagen Broken Shutters
September 28, 2014

Calculus
"Three hundred books sell for $40 each, resulting in a revenue of $12,000. For each $5 increase in price, 25 fewer books are sold. Write revenue R as a function of the number x of $5 increases." How would you get this problem started?
September 8, 2014

Geom
Given 70 degrees on a clock tell what time it is
August 20, 2014

algebra
I was looking for the estimated answer not the correct answer or formula to estimate
August 8, 2014

algebra
7 1/5 divided by 3/5 estimated
August 8, 2014

algebra
A manufacturer of birds feeder cut spacers from a tube that is 7 1/5 inches long. How many spacers can be cut from the tube if each spacer must be 3/5 inch thick. The estimated answer is?
August 8, 2014

algebra
p=b+a+c b=
August 7, 2014

algebra
z=yn y=
August 7, 2014

algebra
13x+2>3((2x+1)-x+8
August 1, 2014

algebra
x=1
August 1, 2014

algebra
3x+6+x<1+2x-5
August 1, 2014

algebra
P=a+b+2c for a
August 1, 2014

Physics
A heavier mass m1 and a lighter mass m2 are 20.5 cm apart and experience a gravitational force of attraction that is 8.60 10-9 N in magnitude. The two masses have a combined value of 5.80 kg. Determine the value of each individual mass.
June 22, 2014

physical science
bombarded by high-speed electrons.
June 11, 2014

math
You need to hire a part-time associate to work 30 hours a week in your store. You have $250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid $9.00 per hour. Your average part-time ...
May 12, 2014

history
The answer is A
April 21, 2014

Chemistry
My question is ..can anyone explain how to do problem #2? I feel lost. :( And could you also explain why? Problem#1, is that a regular dG = dH - TdS problem? Then using Go = -RTlnK to find K? Im just afraid if there are other seps to it.. 1. The combustion of butane has the ...
April 6, 2014

Chemistry
I got it! I was using the incorrect Kb for each of the reactions! Thanks so much!!!
April 5, 2014

Chemistry
Okay, thank you! I will try this method!
April 5, 2014

Chemistry
Calculate the concentrations of all species in a 0.390 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Species: Na+ SO3 2- HSO3 - H2SO3 OH- H+ Thanks! The only thing I seem to be ...
April 5, 2014

Finance
Thanks for the help and explanation!
April 2, 2014

Finance
Kim has money in a savings account that earns an annual interest rate of 4.1%, compounded monthly. What is the effective rate of interest on Kim's account? Round to the nearest hundredth of a percent.
April 2, 2014

science
an individual's actual appearance. may include physical characteristics, microsoptic or metabolic charisteristics
March 14, 2014

finance
Thanks for the explanation Henry!
March 12, 2014

finance
For a $13,000 student loan with a 6% APR, how much of the payment will go toward the principal and how much will go toward paying interest for each of the first six payments? Assume this is a 10-year loan with monthly payments.
March 12, 2014

Liberal Arts Math II
How long is the perimeter of a snowflake island? A) it is the same as the area B) it is infinite C) 2 times the height D) 3 times the height
March 11, 2014

Business Law II
Thanks for your help, I read over the others and also dug a little deeper in my book and I think that's the best choice as well.
March 1, 2014

Business Law II
Okay, I have eliminated A & D
March 1, 2014

Business Law II
Initially I thought Gramm-Leach-Bliley Privacy Act but I don't see this in my book.
March 1, 2014

Business Law II
What statute requires banks and other financial institutions to disclose to consumers any non-public information they wish to reveal to third parties? A) Banking and Financial Institution Privacy Act. B) Gramm-Leach-Bliley Privacy Act. C) Electronic Communications Privacy Act...
March 1, 2014

business law
You make an online purchase of a hooded sweatshirt with the logo of the Dallas Cowboys. The next time you log on, your screen has a banner ad for Dallas Cowboy hats and shirts. This banner ad is most likely the result of: A) a cookie. B) a coincidence. C) the Internet crime of...
March 1, 2014

Liberal Arts Math II
Choose one of the following statements to complete the sentence. Discuss your reasoning for your selection. Euclid’s treatment of the fifth axiom... A) ... shows that it is important to question the nature of the assumptions that are made. B) ... is now known to be wrong...
February 26, 2014

Business Law II
Yi conveyed a piece of land by general warranty deed. The deed included a covenant of seisin. With this covenant, Yi promised that: A) she has the power to make the conveyance. B) the land is free from any easement, profit, mortgage, etc. C) no other person can lawfully claim ...
February 8, 2014

Business Law II
Ross is a wealthy man. Out of the kindness of his heart, he transfers a piece of real property to his church, "for as long as the property is used for church purposes." Ross has created which of the following ownership interests? A) Life estate to the church; ...
February 8, 2014

Math
problems with words that are is to solve
February 2, 2014

trig
Thank you so much for the help.
January 26, 2014

trig
A person stands at a distance from the tower and eyes the top of the tower at 30 degree angle of elevation. He then walks 425 feet towards the tower and eyes the top of the tower at a 58 degree angle of elevation. The person is 5 feet tall. How tall is the tower?
January 26, 2014

Liberal Arts Math II
The following argument is valid: No student is happy You are happy Therefore, you are not a student A) True B) False
January 18, 2014

Finite Math
Thank you both. I tried this using the "72 rule" and was discouraged by my answer due to the book answer of 9.64% and I am not sure how that answer is founded.
January 16, 2014

Finite Math
A person invests $2000 annually in an IRA. At the end of 6 years, the amount in the fund is $14000. What annual nominal compounding rate has this fund earned?
January 16, 2014

Chemistry
Calculate (in calories) the amount of heat needed to melt 96g of ice at -24 degrees C to water at 28 degrees C.
January 15, 2014

math
2,3x-5
December 1, 2013

poetry
What are the names of the different kinds of formats? Stanzas still doesn't make sense to me please elaborate
October 5, 2013

poetry
Sorry about that yes its supposed to be in this way. Please help in telling me what format is being used. Thanks and sorry about that
October 5, 2013

poetry
I need to know what format is being used in this poem: Canadian Angels Angels of the House, Angels of Mercy- yes, they've called women that. But these are Angels of Ice,Hard-muscled, sharp, dangerous as winter's cold. How else do you explain their speed, the light ...
October 5, 2013

Finance
Your small business needs to buy new office furniture for your new headquarters. You have the option of leasing the furniture, or buying the furniture. You can purchase the furniture for $15,000 per year, or lease the same furniture for $5,000 per year for the next four years...
September 23, 2013

Chemistry
I am having a really hard time setting this problem up to solve can anyone help? Hexane has a density of 0.659 g/mL. How many (mL) would a student need to pour in order to get 49.5g of hexane?
September 11, 2013

math
medical math guestion
August 18, 2013

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