Bryant

Most popular questions and responses by Bryant
  1. Chemistry check

    Could someone please just check my answers for this? I want to make sure I did these right. 1. A student reported the mass of ten glass beads as 2.507 +/- 0.015 g. What should the student report as the mass of one bead? Explain your answer. A: The student

    asked on January 30, 2007
  2. Chemistry help

    Hey...I just want to make sure my answers to these questions are correct... 1. d=2.507 g/1.22 mL = 2.054918033 g mL^-1 explain how both the rules for significant figures and the random error calculation (p(d) = +-0.34 g mL^-1) indicate that the digits

    asked on January 24, 2007
  3. Math

    After Khalil gave Benjamin 3/5 of the rocks in his collection, Benjamin had 70 rocks. If Benjamin had 25 rocks in the beginning, how many rocks did Khalil have in the beginning?

    asked on January 16, 2014
  4. Chemistry

    Hi DrBob, Sorry about that, I wasn't very clear! Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check:

    asked on March 6, 2011
  5. Statistics

    The mean amount spent by a family on food per month is $500 with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends more than $410 per month? Plesase show formula and calcuation.

    asked on January 26, 2010
  6. Math

    Using the Substitution method solve 7x+5y=-23 -6x+y=25

    asked on March 21, 2010
  7. math

    write expanded notation.40,050

    asked on March 19, 2013
  8. Calculus

    lim (x^3-1)/(x^3+2x^2y+xy^2-x^2-2xy-y^2) (x,y)->(1,0) alright i approached this at y=0. and got the limit as 3. where else can i approach this from to see if the limit really exist which im hoping it doesn't. i tried y=x-1 and that was a mess and i also

    asked on February 28, 2012
  9. calculus

    A 160-lb man carries a 25-lb can of paint up a helical staircase that encircles a silo witha radius of 20 ft. If the silo is 90 ft high and the man makes exactly three complete revolutions, how much work is done by the man against gravity in climbing to

    asked on April 16, 2012
  10. Chemistry

    Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check: 0.09600g/(214.0g/mol)=4.486x 10^-4 mol -4.486

    asked on March 6, 2011
  11. MEASUREMENTS

    jOSE HAS A 15-M^2 GARDEN AND PLANS TO BUY SOME MULCH TO COVER HIS GARDEN. ON THE BAG OF MULCH IT SAYS ONE BAG OF MULCH WILL COVER 20FT^2. iF EACH BAG COST $2.00 . hOW MUCH WILL IT COST TO MULCH THE GARDEN? 20FT^2*1YD^2/9FT^2*$2.00/1YD^2

    asked on May 1, 2016
  12. Differential Equations

    x dy/dx + y = 1/y^2, solve using bernoulli's equation. i got to du/dx + (2u)/x = 2x(u)^(-1/2). the u^(-1/2) is obviously a problem if im going to solve it using an integrating factor. if that is not what you yourself have gotten to then please show me my

    asked on September 25, 2012
  13. calculus

    lim (x^3-1)/(x^3+2x^2y+xy^2-x^2-2xy-y^2) (x,y)->(1,0) my question is can you approach (1,0) with y=x and does that change the the limit to lim f(x,x) (x,x)->(1,1) in which case i get 3/4 as the limit. and if this is not how i go about doing it can you

    asked on February 28, 2012
  14. statistics

    In response to media inquiries and concerns expressed by groups opposed to violence, the president of a university with over 25,000 students has agreed to survey a simply random sample of her students to find out whether the student body thinks the

    asked on July 31, 2009
  15. math

    A company has sales (measured in millions of dollars) of 50, 60, and 75 during the first three consecutive years. Find a quadratic function that fits these data, and use the result to predict the sales during the fourth year. Assume that the quadratic

    asked on May 31, 2010
  16. chemistry

    what is the pH of a solution prepared by adding 0.65mol of LiOH(aq) to 1.0L of 0.30mol/L HNO3(aq)>

    asked on October 3, 2016
  17. Math

    (x^4-11x^3+43x^2-40x+19) ÷ (x^2-9) Long division

    asked on February 4, 2013
  18. Statistics

    A bank wishes to estimate the mean balances owed by their MasterCard customers within $75. The population standard deviation is estimated to be $300. If a 98% confidence interval is used, how many cardholders should be sample. Please provide sample size

    asked on January 26, 2010
  19. physics

    Using units, show that kg x m/s is equivalent to N x s

    asked on November 17, 2008
  20. calculus

    Find the tangential and normal components of acceleration of an object that moves along the parabolic path y=4x^2 at the instant the speed ds/dt=5. I know how to find the both these given a vector but no idea when given just a path and speed. i figured i

    asked on May 8, 2012
  21. calculus

    Find the volume V of the solid in the rst octant bounded by y = 0, z = 0, y = 3, z = x, and z + x = 4. The best part about this problem is that I solved it using basic geometry but am expected to do it using a triple integral that will take up a whole

    asked on March 26, 2012
  22. calculus

    Suppose R is the rectangle 1

    asked on March 18, 2012
  23. calculus

    If u = log(r), where r^2 = (x-a)^2 + (y-b)^2, and (x-1) and (y-b) are not zero simultaneously, show that d^2u/dx^2 + d^2u/dy^2 = 0. I first used some of the properties of log and made u = 1/2 * log((x-a)^2 + (y-b)^2) Then made u = 1/2 * ln((x-a)^2 +

    asked on March 4, 2012
  24. Statistics

    Formula used to calculate confidence interval..please give example. Thanks

    asked on January 26, 2010
  25. OPERATING SYSTEMS

    A _________IS AN AREA OF HIGH SPEED MEMORY THAT SITS BETWEEN THE PROCESSER AND THE PRIMARY MEMORY.

    asked on January 25, 2010
  26. business statistics

    Your statistics instructor wants you to determine a confindence interval estimate for the mean test score for the next exam. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9. A 95% confidence

    asked on August 1, 2009
  27. physics

    Using units, show that kg x m/s is equivalent to N x s

    asked on November 17, 2008
  28. Math

    In 1995-96 academic year there were 86,087 bachelor degrees awarded. That number fell to 71,261 for 2002-2003 school year. In 2008-09 it rose to 120,488 . How much greater was the percent increase from 2003 to 2009? How much was the percent decrease from

    asked on April 17, 2016
  29. math

    Submit the two equations that represent the cost of going to the gym based on if we join or do not join. Identify the number of times a person would go and have the costs of the 2 plans be the same.

    asked on May 3, 2013
  30. calculus

    Let z = ∫(e^sin(t)dt) from x to y a = x b = y I tried thinking about it like a chain rule but even then i'm a little unsure. I know dz/dt = e^sin(t). Can you please point me in the right direction if i'm supposed to use the chain rule.

    asked on March 7, 2012
  31. literature

    Hopkin's use of seared , bleared and smeared is an example of?

    asked on June 5, 2010
  32. Statistics

    Comcast wants to know the percent of their cable subscribers who use the internet at home. How large of a sample size should they survey to determine the proportion who use the internet within 2% and with 90% confidence interval. Please show formula when

    asked on January 26, 2010
  33. business statistics

    If a sample of size 30 is selected, the value of A for the probability p(>- A) = 0.01 is?

    asked on August 1, 2009
  34. statistics

    An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation of ó = 3 lb-ft in the torque applied. A simple random sample of 35 nuts is selected, and the

    asked on July 31, 2009
  35. CONSUMER MATH

    You are offered $12,000 for an annuity at 3.9% compounded monthly for 6 yrs what would the monthly payments be?

    asked on April 13, 2016
  36. Math

    (x^4-11x^3+43x^2-40x+19) ÷ (x^2-9)

    asked on February 3, 2013
  37. Differential Equations

    A government agency has a current staff of 5000, of whom 25% are women. Employees are quitting randomly at the rate of 100 per week. Replacements are being hired at the rate of 50 per week, with the requirement that half be women. Interested in the rate of

    asked on October 30, 2012
  38. math

    what is true of all values of x that will make divisible 2*x by6

    asked on October 10, 2012
  39. calculus

    Consider ∫R∫xydA, where R is the square R=[0,1]x[0,1]. Let us compute some Riemann sums. For any positive integer n we partition R into n^2 little squares Rij each with sides 1/n long. Within each little square we evaluate the integradn at the point

    asked on March 20, 2012
  40. calculus

    Consider ∫R∫syDA, where R is the square R=[0,1]x[0,1]. Let us compute some Riemann sums. For any positive integer n we partition R into n^2 little squares Rij each with sides 1/n long. Within each little square we evaluate the integradn at the point

    asked on March 20, 2012
  41. Statistics

    How can I calcualate the probability of a normal distribution. Please present formula and an example. Thanks.

    asked on January 26, 2010
  42. Statistics

    Formula used to easily calcuate sample size. Please give example.

    asked on January 26, 2010
  43. Statistics

    Construct a descriptive statistics for 100 employees using intervals of 0-4, 4-8, 8-12, 12-16, 16-20.

    asked on January 26, 2010
  44. Statistics

    Construct a frequency distribution for 100 employees using intervals of 0-4, 4-8, 8-12, 12-16, 16-20.

    asked on January 26, 2010
  45. Statistics

    A data contains a random sample of 100 employees with eduation levels. Please construct a 90% confidence interval of the proportion of employees, which is 51 total, who do not have a college degree.

    asked on January 26, 2010
  46. Statistics

    A resort tracks the number of days each guest stays. They've discovered that this variable is normally distributed with a mean of 9 days and a standard deviation of 3. They would expect 10% of the guest stay longer than how many days? Please show

    asked on January 26, 2010
  47. Statistics

    Using the information presented in the table in Exercise , calculate the following probabilities? Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% ¡Ý0.10% D 0-19 142 7 6 155 E 20-39 47 8 41 96 F 40-59 29 8 77 114 G 60 or over 47 7 35 89 265 30

    asked on July 20, 2009
  48. math

    P is a point on the x-axis 13 units from the point (-3,5). find all the possible coordinates for P.

    asked on September 2, 2008
  1. Chemistry

    1.5 liter flask is filled with nitrogen at pressure of 12 atmosphere. What size would be required to hold this gas at a pressure of 2.0 atmosphere?

    posted on March 14, 2016
  2. 3rd grade math

    4 1/2

    posted on April 19, 2013
  3. Finance

    Calculate the return on investment in dollars and as a percentage for an investment that you purchase for $500 and sell for $600.

    posted on November 25, 2012
  4. Differential Equations

    oh, never mind. I've seen my mistake. disregard this question.

    posted on September 25, 2012
  5. calculus

    never mind. i thought about it and it is the work done by gravity. not the man. which leads me to another question. how exactly would you find the work done by the man. would he be represented as another vector or or in the vector field?

    posted on April 16, 2012
  6. calculus

    i meant ∫R∫xydA

    posted on March 20, 2012
  7. calculus

    oh never mind. i looked back and saw that i differentiated wrong on a step

    posted on March 4, 2012
  8. algebra

    use google-fu next time and look these things up. volume of a rectangular prism = abc just convert inches to feet. then multiply.

    posted on March 4, 2012
  9. algebra

    solve for what?

    posted on February 28, 2012
  10. COLLEGE CALCULUS. HELP!

    cos(sin(x))*cos(x) 16sin^3(x)*cos(x) d/dx(f(x))= f'(x)*x'

    posted on February 28, 2012
  11. calculus

    then what can i approach by as well cause i also tried y=x-1 and that was just a mess.

    posted on February 28, 2012
  12. calculus

    or does x=0 not work because x does not equal zero on the point (1,0). cause my teacher was fairly lazy in class and used the point (0,0) for every example.

    posted on February 28, 2012
  13. calculus

    alright thanks, my teacher never showed us that if you set one of the variables equal to zero you can make it a one variable function. so say i approach x=0 and find the limit of that to be infinity. does the original function f(x,y) not exist?

    posted on February 28, 2012
  14. Calculus. I need help!

    im guessing you meant sin(x)^5. in which case yeah you did it wrong. you derive (x)^k , k being a constant, like this k*(x)^(k-1)*x' so f'(x)=5sin(x)^4*cos(x)

    posted on February 28, 2012
  15. Math

    I am confused how you would get an order pair from that....can you help?

    posted on March 21, 2010