bryant
Most popular questions and responses by bryant
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 
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 
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 
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 
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 
Math
Using the Substitution method solve 7x+5y=23 6x+y=25
asked on March 21, 2010 
math
write expanded notation.40,050
asked on March 19, 2013 
Calculus
lim (x^31)/(x^3+2x^2y+xy^2x^22xyy^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=x1 and that was a mess and i also
asked on February 28, 2012 
calculus
A 160lb man carries a 25lb 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 
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 
MEASUREMENTS
jOSE HAS A 15M^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 
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 
calculus
lim (x^31)/(x^3+2x^2y+xy^2x^22xyy^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 
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 
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 
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 
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 
physics
Using units, show that kg x m/s is equivalent to N x s
asked on November 17, 2008 
Math
(x^411x^3+43x^240x+19) ÷ (x^29) Long division
asked on February 4, 2013 
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 
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 
calculus
If u = log(r), where r^2 = (xa)^2 + (yb)^2, and (x1) and (yb) 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((xa)^2 + (yb)^2) Then made u = 1/2 * ln((xa)^2 +
asked on March 4, 2012 
Statistics
Formula used to calculate confidence interval..please give example. Thanks
asked on January 26, 2010 
physics
Using units, show that kg x m/s is equivalent to N x s
asked on November 17, 2008 
Math
In 199596 academic year there were 86,087 bachelor degrees awarded. That number fell to 71,261 for 20022003 school year. In 200809 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 
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 
calculus
Suppose R is the rectangle 1
asked on March 18, 2012 
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 
literature
Hopkin's use of seared , bleared and smeared is an example of?
asked on June 5, 2010 
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 
OPERATING SYSTEMS
A _________IS AN AREA OF HIGH SPEED MEMORY THAT SITS BETWEEN THE PROCESSER AND THE PRIMARY MEMORY.
asked on January 25, 2010 
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 
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 
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 lbft in the torque applied. A simple random sample of 35 nuts is selected, and the
asked on July 31, 2009 
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 
Math
(x^411x^3+43x^240x+19) ÷ (x^29)
asked on February 3, 2013 
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 
math
what is true of all values of x that will make divisible 2*x by6
asked on October 10, 2012 
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 
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 
Statistics
How can I calcualate the probability of a normal distribution. Please present formula and an example. Thanks.
asked on January 26, 2010 
Statistics
Formula used to easily calcuate sample size. Please give example.
asked on January 26, 2010 
Statistics
Construct a descriptive statistics for 100 employees using intervals of 04, 48, 812, 1216, 1620.
asked on January 26, 2010 
Statistics
Construct a frequency distribution for 100 employees using intervals of 04, 48, 812, 1216, 1620.
asked on January 26, 2010 
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 
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 
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% 0.010.09% ¡Ý0.10% D 019 142 7 6 155 E 2039 47 8 41 96 F 4059 29 8 77 114 G 60 or over 47 7 35 89 265 30
asked on July 20, 2009 
math
P is a point on the xaxis 13 units from the point (3,5). find all the possible coordinates for P.
asked on September 2, 2008

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 
3rd grade math
4 1/2
posted on April 19, 2013 
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 
Differential Equations
oh, never mind. I've seen my mistake. disregard this question.
posted on September 25, 2012 
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 
calculus
i meant ∫R∫xydA
posted on March 20, 2012 
calculus
oh never mind. i looked back and saw that i differentiated wrong on a step
posted on March 4, 2012 
algebra
use googlefu 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 
algebra
solve for what?
posted on February 28, 2012 
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 
calculus
then what can i approach by as well cause i also tried y=x1 and that was just a mess.
posted on February 28, 2012 
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 
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 
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)^(k1)*x' so f'(x)=5sin(x)^4*cos(x)
posted on February 28, 2012 
Math
I am confused how you would get an order pair from that....can you help?
posted on March 21, 2010