Tuesday

December 1, 2015
Total # Posts: 273

**chem**

A 1.27-g sample of a mixture of AgNO3 and NaNO3 is treated with excess Na2S(aq). The precipitate is filtered off, dried and weighed. The dried precipitate weighs 0.46 g. What is the percentage by mass of NaNO3 in the original mixture?
*October 12, 2015*

**Calculus**

Let u=f(r) and r=|x|=(x1^2 +···|xn^2)^1/2. Show that ∑ 1 to n (∂u/∂xj)^2 = (f′(r))^2
*September 27, 2015*

**math**

order of operations; simplify 4.5-10-2(1-2)+5 thank you!
*August 25, 2015*

**math**

is the number 1 a prime or composite number?
*August 20, 2015*

**Kgothala secondary **

Life oriatation, description of recent service delivery protest
*August 5, 2015*

**Kgothala secondary **

Life oriatation
*August 5, 2015*

**life orientation**

Evaluation of current protests
*May 24, 2015*

**life orientation**

Research on process of campaigns and protests
*May 24, 2015*

**Spanish**

Thanks so much for all your suggestions and all your time! I really appreciate all your help!
*April 19, 2015*

**Spanish**

Can someone proof my spanish composition? Aprenda a vivir con la diabetes tipo 2 La diabetes tipo 2 es, desafortunadamente, una enfermedad muy común en los EEUU. Si usted ha sido diagnosticado con la diabetes tipo 2, es normal sentirse confundido, triste o enojado. ...
*April 19, 2015*

**Math**

Assume the shoe is sold at 50% profit margin (profit as % of sales). If the cost of raw material were to increase by 50%, what would the new profit margin be? Cost of manufacturing a shoe: Raw materials = 25% Labor = 12.5% Marketing & Advertising = 25% Distribution = 25% ...
*February 2, 2015*

**science**

How might the history of the US be different if the first European settlements had occurred on the west coast instead of the east coast
*January 15, 2015*

**english**

Thanks
*January 6, 2015*

**english**

I have to find the correct article that goes in the sentence. 1.)Usually ___ strange bird is a timid animal. Article- the.
*January 6, 2015*

**math**

Jane is organizing her 24 dolls into equal sized piles. What is the possible number of dolls that could be in each pile?
*October 14, 2014*

**statistics**

The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of all statistics textbooks. 109.95; 92.00; 96.70; 84.85; 92.60; 84.45; 90.95; 77.00...
*July 31, 2014*

**Physics**

I know this is long but can someone just explain it to me? Please? Don't have to give the answer, I'm just confused :( 1. An experiment was devised to investigate the effects on the temperature of a cup of hot tea when lemon juice is added at different time intervals. ...
*June 3, 2014*

**Math**

A triangular piece of land has a base of 12 yards and a height of 16 yards.what is the area of the piece of land?
*April 23, 2014*

**physics**

From a to b Wg= Fx cos 90 = 0 Wn= Fx cos 90 = 0 Wnet=Efk - Eik. Which is = to 1/2mVf^2 -1/2 mVi^2. Fxcos(0)= Efk. Cos of 0 =1. Vi =0 so use Efk Fx=1/2mVf^2 2Fx/m = Vf^2 Vf^2= square root of2Fx/m Vf= 9.77m/s X = distance, m= mass, F= force, V= velocity Efk = final kinetic ...
*March 23, 2014*

**physics**

7. ( 11E ) a) Find the momentum of an automobile of mass 2630 kg traveling 21.0 ms .b) Find the velocity ( in km/h ) of a light auto of mass 1170 kg so that it has the same momentum as the auto in part ( a ).
*March 23, 2014*

**physics**

52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the final speed of the crate?
*March 23, 2014*

**math**

100
*March 19, 2014*

**math**

What numbers value is 100, 000 less than 1, 547, 298?
*March 19, 2014*

**statistics**

A clinical trial test a method designed to increase probability of conceiving a girl.In study 375 were born and 300 were girls Use sample data to construct 99%confidence interval of percentage girls born
*March 17, 2014*

**Math**

Find the standard form of the equation of a line passing through (2, 3) and parallel to 3x + 5y = 2
*March 8, 2014*

**Math**

If x varies directly as y, and if x = 6 when y = 15, find y when x = 30
*February 20, 2014*

**Math**

If x varies inversely as y, and if x = 24 when y = 6, find x when y = 15.
*February 20, 2014*

**Math**

The 80 students in the 5th grade at north side elementary school voted for their favorite animal after a trip to the zoo.the elephant received 3/5 of the votes.how many votes did the elephant receive.
*February 5, 2014*

**Math**

It takes Kelly 3/4 hour to bake a small loaf of bread.how many loaves of bread can she bake in 3 3/4 hours if she bakes one loaf at a time.
*February 5, 2014*

**Math**

Tickets for the school play were $6.00 and 1/5 of each ticket paid for the cost of printing the programs.how much of each ticket went towards printing the programs.
*February 5, 2014*

**Math**

The area of a rug was 45 square ft.the rug was separated equally into four colors.how many square feet were there in each color?
*February 5, 2014*

**Physics**

all of the above
*February 4, 2014*

**Geometry**

In geometry, a common standard setting for enlarging on a copy machine is 121 percent. What does this mean?
*November 25, 2013*

**Geometry**

How many diagonals does a prism have whose base is a regular polygon with 3 sides?
*November 24, 2013*

**business math**

Sam Long anticipates he will need approximately $225,000 in 15 years to cover his 3-year-old daughter’s college bills for a 4-year degree.How much would he have to invest today at an interest rate of 8 percent compounded semiannually?
*October 25, 2013*

**math**

Joanne and Ed Greenwood built a new barn with an attached arena. To finance the loan, they paid $1,307 interest on $45,000 at 4.0%. What was the time, using exact interest?
*October 14, 2013*

**physical science**

A 12-kg iron ball is dropped onto a pavement from a height of 90m. Suppose half of the heat generated goes into warming the ball. What is the temperature increase of the ball in degree C
*October 6, 2013*

**college algebra**

Find the intercepts of the function f(x). f(x) = (x - 2)2(x2 - 9)
*September 12, 2013*

**Math**

James has 10,000 to invest. If he invest money in a savings account that pays 4% APR, calculate the following: a) how long will it take to have a total of 15,000 if interest is compounded quarterly (3months)? b)how much will he have after 7yrs if interest is compounded yearly...
*April 28, 2013*

**math**

Compound Interest Question James has 10,000 to invest. If he invest money in a savings account that pays 4% APR, calculate the following: a) how long will it take to have a total of 15,000 if interest is compounded quarterly (3months)? b)how much will he have after 7yrs if ...
*April 28, 2013*

**Public Speaking**

Thanks so much for your help! I received a 100 :)
*April 26, 2013*

**Public Speaking**

To avoid speaking in monotone, a strategy to use can include: A. changing pitch and tone of voice. B. voice inflection. C. varying rate and pace of speaking. D. All of the above I read through my notes and I see A and B as answers, I don't see anything about C... But I'...
*April 26, 2013*

**accounting**

how to The beginning inventory of merchandise at Francesca Co. and data on purchases and sales for a three-month period are as follows:
*March 27, 2013*

**math**

I made a area in my question i meant to say how do you work this problem?what precent of 3.5 is 7.2.
*March 15, 2013*

**math**

HOW THE YOU WORK THIS PROBLEM?WHAT PRECENT OF 3.5 IS 7.2
*March 15, 2013*

**Economics**

In two or three paraghaphs,discuss how industrial growth in Texas has affected its natural resources
*January 15, 2013*

**Physics**

What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?
*December 2, 2012*

**pre calculus**

24
*November 30, 2012*

**math**

perform the indicated operation and expres your answer in simplest radical form ^3 sqrt 8 / ^4sqrt 8
*November 25, 2012*

**economics**

galacia will produce and export soup and fancia produce and export galacia
*November 13, 2012*

**calculus**

Wiley jumps straight up in the air from the edge of a cliff so that when he comes down he falls off the cliff. The cliff is 40 feet off the ground. His height t seconds after he jumps is s= -16t2 + 12t + 40.What is the maximum height? What is his maximum velocity?
*November 12, 2012*

**calculus **

let f(x) = 2x^5-5x^4 find open intervals on which f is a) increasing b)decreasing Find values of x at which f has c) relative max and min find open intervals d) concave upward e) concave downward c) find the inflection points of f
*November 4, 2012*

**Physics**

How many calories it take to elevate the temperature of 10 gr of water-from 26C to 50C?
*October 22, 2012*

**MATH**

BENNY PLAYS TWO SPORTS. HE PLAYS SOCCER FOR 3/4 OF THE TIME AND PLAYS BASEBALL FOR 30-MINUTES. HOW MANY MORE MINUTES DOES HE PLAY SOCCER THAN BASEBALL? My answer is he plays soccer 7 minutes more. Am I correct. How do I make a diagram for this problem. Thanks
*October 9, 2012*

**Math**

thanks
*October 8, 2012*

**Math**

Ms. Kenny grew 3/5 as many zinnias as Mr. Hadam. If Ms. Kenny has 12 zinnias, how many zinnias do they have in all. I calculated that they have 20 zinnias total. Am I correct. Thanks
*October 8, 2012*

**Jr. Math**

thanks
*October 8, 2012*

**college algebra**

solve x^6 - 64 = 0
*October 5, 2012*

**College Algebra**

solve the equation for r: S= (rL-a)/(r-x)
*September 25, 2012*

**math**

how would you fidn the area of a square if you know one side is 4 feet long
*September 17, 2012*

**Math**

2336.8
*September 12, 2012*

**physics**

Landing with a speed of 87.7 m/s, and traveling due south, a jet comes to rest in 939 m. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration. Magnitude of acceleration
*September 5, 2012*

**math**

a convenience store sells 1650 items,are of 12/25 junk food
*July 24, 2012*

**Physics**

Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie ...
*June 15, 2012*

**math**

The equation of a parabola is y=(x-5)^2-4. Is the point (5,-6) on this parabola?
*June 6, 2012*

**math**

Find the value of C that will make 25x^2-40x+c a perfect trinomial.
*June 6, 2012*

**math**

Nine cards are numbered 1-9. what is the probability of drawing a number greater than 6 or an odd number. I know the answer is 2/3 but I don't know how you find the probability when it says "greather than 6 OR and odd number"... how do you calculate the OR?
*June 6, 2012*

**math**

Given a right triangle ABC, if the measure of angle B=30 degrees, the measure of angle C=90 degrees, and AB=5cm, find AC
*June 6, 2012*

**Chemistry - Equilibrium**

You have an unknown concentration of ammonia. When you add 15.0mL of a 0.400 M HCl solution to 50.0mL of the ammonia solution, the pH of the solution becomes 8.75. What is the concentration of the original ammonia solution? [Kb (NH3) = 1.8 x 10^-5]
*April 25, 2012*

**math**

only 5% of the carbon-14 in a small wooden bowl remains , how old is the bowl? Hint, half-life for carbon –14 us 5730 years
*April 4, 2012*

**math 125**

solve the system 2x-3y-z=-8 x-y--z=-2 -4x+3y+z=6
*March 24, 2012*

**physics**

A certain spring stretches 5.0cm when a load of 40N is suspended from it. How much will the spring stretch if 46N is suspended from it(and it doesn't reach its elastic limit)?
*March 22, 2012*

**math**

how would you solve: (t-2)(3t-1)(4t+3)-(2-t)(2-t)(t+5)
*February 26, 2012*

**biology**

Can someone please explain to be the concept of - Rate of exchange is proportional to a cells surface area and ... the amount of exchange material is proportional to a cell's volume. (the topic we are learning is called "Animal form and function")
*February 14, 2012*

**Languages**

How do you say the word "love" and "kind" is many languages. (the language doesnt matter, a list would be great)
*February 12, 2012*

**algebra**

2w -4 = l 2w +2l = 172 plug in for l and find w. then plug in w to find l then a=lw
*February 4, 2012*

**Pre-Algrebra**

1. first distribute 2(m+3) = 2m + 6 then add like terms together 3m + 6 = 78 then sub. 6 3m= 72 last divide by 3 m=24
*February 4, 2012*

**History- spanish**

thanks
*February 4, 2012*

**History- spanish**

i already searched that under google and most of the sites only showed and described a certain painting of his. And no i couldnt find it. It doesnt say this birthname was anything different than Jose antonio Velazquez so is taht it??
*February 4, 2012*

**History- spanish**

What was Jose Antonio Velazquez's birth name? I do not know if that is his birth name
*February 4, 2012*

**science**

I have a test tomorrow and i need to be able to say what type of bacteria something is in their agar colonies. I am having a hard time diffirentiating between bacillus cereus and bacillus subtilis. does anyone have any good websites that would help? or know any tricks?
*January 31, 2012*

**science**

what does oxytetracycline contain that would destroy bacillus cereus
*January 29, 2012*

**Physics**

The Victoria Falls is the tallest waterfall on Earth measuring 108 meters at its highest point. How long will it take for a single drop of water to fall over its edge into the chasm below? Please check answer, if I am doing it incorrectly help me set it up. the last person who...
*January 28, 2012*

**PHYSICS**

The Victoria Falls is the tallest waterfall on Earth measuring 108 meters at its highest point. How long will it take for a single drop of water to fall over its edge into the chasm below?
*January 27, 2012*

**english**

I have a four page paper I have written for a scholarship. It is still in its rough draft. Would anyone be willing to proof read it?
*January 26, 2012*

**Misc.**

is there a site online that i can find it?
*January 25, 2012*

**Misc.**

How do you know what township you are in?
*January 25, 2012*

**chemistry**

treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
*January 24, 2012*

**chemistry**

treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
*January 24, 2012*

**chemistry**

treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
*January 24, 2012*

**Literacy**

Which Boolean operator limits your search so that each term input must be in the same document
*January 21, 2012*

**Math**

At the school store, colored pencils are reduced from $2.40 a box to $2.00 a box. What is the percent of decrease?
*January 6, 2012*

**bio**

thanks the peptidoglycan is pretty clear. but, do you think you could explain the difference between an exon and intron?? in more simple terms
*January 5, 2012*

**bio**

What are introns and exons? also what is a peptidoglycan( i hope i spelled that right)
*January 5, 2012*

**science**

hello! I need good sites that can help me with my physics class! do you have any ideas??
*January 4, 2012*

**Physics**

An airplane flies due north at 220 km/h with respect to the air. There is a wind blowing at 65 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?
*November 9, 2011*

**economics**

Market demand is given as QD = 200 â€“ 3P. Market supply is given as QS = 2P + 100. Each identical firm has MC = 0.5Q and ATC = 0.25Q. What is each firmâ€™s profit?
*November 3, 2011*

**economics**

A monopolist faces market demand given by P = 200 â€“ Q. For this market, MR = 200 â€“ 2Q and MC = 3Q. What quantity of output will the monopolist produce in order to maximize profits?
*November 3, 2011*

**geometry**

what is the value of x , if one lenght is 16, and the other one is 23
*October 17, 2011*