# 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

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

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?

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:

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.

6. ## Math

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

7. ## math

write expanded notation.40,050

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

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

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

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

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

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

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

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

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)>

17. ## 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

18. ## physics

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

19. ## Math

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

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

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

22. ## 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 +

23. ## Statistics

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

24. ## physics

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

25. ## 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

26. ## 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.

27. ## calculus

Suppose R is the rectangle 1

28. ## 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.

29. ## literature

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

30. ## 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

31. ## OPERATING SYSTEMS

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

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

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

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

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?

36. ## Math

(x^4-11x^3+43x^2-40x+19) ÷ (x^2-9)

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

38. ## math

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

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

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

41. ## Statistics

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

42. ## Statistics

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

43. ## Statistics

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

44. ## Statistics

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

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.

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

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

48. ## math

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

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

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