Wednesday

March 4, 2015

March 4, 2015

Total # Posts: 58

**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?
*January 16, 2014*

**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.
*May 3, 2013*

**3rd grade math**

4 1/2
*April 18, 2013*

**math**

write expanded notation.40,050
*March 19, 2013*

**Math**

(x^4-11x^3+43x^2-40x+19) ÷ (x^2-9) Long division
*February 4, 2013*

**Math**

(x^4-11x^3+43x^2-40x+19) ÷ (x^2-9)
*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 women coming in and ...
*October 30, 2012*

**math**

what is true of all values of x that will make divisible 2*x by6
*October 10, 2012*

**Differential Equations**

oh, never mind. I've seen my mistake. disregard this question.
*September 25, 2012*

**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 error.
*September 25, 2012*

**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 had to solve for the ...
*May 8, 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?
*April 16, 2012*

**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 the top? I looked at ...
*April 16, 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 page. I'm honestly ...
*March 26, 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 (x*ij,y*ij), ...
*March 20, 2012*

**calculus**

i meant ∫R∫xydA
*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 (x*ij,y*ij), ...
*March 20, 2012*

**calculus**

Suppose R is the rectangle 1<=x<=4, |y|<=2 and evaluate the double integral ∫R∫f(x,y)dA, where f(x,y)= y/(1+3x^4)^(1/2). I first decided to integrate with respect to y first (which I think I can choose to do) I am a little confused at this part though ...
*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.
*March 7, 2012*

**algebra**

use google-fu next time and look these things up. volume of a rectangular prism = abc just convert inches to feet. then multiply.
*March 4, 2012*

**calculus**

oh never mind. i looked back and saw that i differentiated wrong on a step
*March 4, 2012*

**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 + (y-b)^2)/ln(10) I'm ...
*March 4, 2012*

**algebra**

solve for what?
*February 28, 2012*

**COLLEGE CALCULUS. HELP!**

cos(sin(x))*cos(x) 16sin^3(x)*cos(x) d/dx(f(x))= f'(x)*x'
*February 28, 2012*

**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 tried y=mx which...
*February 28, 2012*

**calculus**

then what can i approach by as well cause i also tried y=x-1 and that was just a mess.
*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.
*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?
*February 28, 2012*

**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 point me in the ...
*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)^(k-1)*x' so f'(x)=5sin(x)^4*cos(x)
*February 28, 2012*

**Finance**

Calculate the return on investment in dollars and as a percentage for an investment that you purchase for $500 and sell for $600.
*April 24, 2011*

**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: 0.09600g/(214.0g/mol)=...
*March 6, 2011*

**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 mol/0.1L= 44.86 M B. ...
*March 6, 2011*

**literature**

Hopkin's use of seared , bleared and smeared is an example of?
*June 5, 2010*

**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 function is of the form y...
*May 31, 2010*

**Math**

I am confused how you would get an order pair from that....can you help?
*March 21, 2010*

**Math**

Using the Substitution method solve 7x+5y=-23 -6x+y=25
*March 21, 2010*

**Statistics**

How can I calcualate the probability of a normal distribution. Please present formula and an example. Thanks.
*January 26, 2010*

**Statistics**

Formula used to calculate confidence interval..please give example. Thanks
*January 26, 2010*

**Statistics**

Formula used to easily calcuate sample size. Please give example.
*January 26, 2010*

**Statistics**

Construct a descriptive statistics for 100 employees using intervals of 0-4, 4-8, 8-12, 12-16, 16-20.
*January 26, 2010*

**Statistics**

Construct a frequency distribution for 100 employees using intervals of 0-4, 4-8, 8-12, 12-16, 16-20.
*January 26, 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 computing sample size.
*January 26, 2010*

**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 formula in calcutions.
*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.
*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 statistics formula and ...
*January 26, 2010*

**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.
*January 26, 2010*

**OPERATING SYSTEMS**

A _________IS AN AREA OF HIGH SPEED MEMORY THAT SITS BETWEEN THE PROCESSER AND THE PRIMARY MEMORY.
*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?
*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 interval estimate if...
*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 lb-ft in the torque applied. A simple random sample of 35 nuts is selected, and the average torque to ...
*July 31, 2009*

**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 school’s “...
*July 31, 2009*

**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 30 159 454+ a. ...
*July 20, 2009*

**physics**

Using units, show that kg x m/s is equivalent to N x s
*November 17, 2008*

**physics**

Using units, show that kg x m/s is equivalent to N x s
*November 17, 2008*

**math**

P is a point on the x-axis 13 units from the point (-3,5). find all the possible coordinates for P.
*September 2, 2008*

**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 should report the ...
*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 after the hundreths place...
*January 24, 2007*

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