irina
Most popular questions and responses by irina
chemistry
How to prepare 0.2M of NaOH in 250ml volumetric flask???
asked on January 15, 2015 
Physics
A 11.3 weather rocket generates a thrust of 240 . The rocket, pointing upward, is clamped to thetop of a vertical spring. The bottom of the spring, whose springconstant is 570 , is anchored to the ground. Initially, before the engine is ignited, therocket
asked on February 23, 2011 
math
Mrs. Diaz wishes to save at least $1500 in 12 months. If she save $300 during the first 4 months, what is the least possible average amount that she must save in each of the remaining 8 months? After 4 months, 4 x 300 = $1200 will be saved. That leaves
asked on January 9, 2007 
precalculus
A machine worth $10,000 new and having a scrap value of $1000 is to be depreciated linearly over an 18year life. What will be the value of the machine after 9 years?
asked on October 7, 2014 
Chemitry
Nitrogen dioxide, NO2, decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2(g)>2NO(g) + O2(g) At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L.
asked on December 2, 2010 
precalculus
It has been discovered in a certain state that the relationship between the number of snow shovels demanded varies linearly with its price. When the price per item was $ 38 ,2200 items were demanded; When the price was $ 49 , 2125 items were demanded.
asked on October 3, 2014 
accounting
Specify which of the following cash transactions would have resulted in the $4,100 posting to the account. (You select more than one answer. Single click the box with a check mark for correct answers and double click to empty the box for the wrong
asked on February 19, 2016 
managment
Toyota used to sit on top of the world. It basked in the reputation of building highquality cars efficiently. It enjoyed unprecedented growth, even surpassing General Motors as the largest car manufacturer in the world. But all of that came tumbling down
asked on September 27, 2011 
Math
Given the following data set, x 0 1 2 3 4 5 6 y 0.06 0.156 0.4056 1.05456 2.741856 7.1288256 18.53494656 Determine by regression the best exponential function that fits the data Function =
asked on March 24, 2015 
Math
The quantity Q of radioactive carbon remaining in a 300  gram wood sample at time t is given by the expression Q(t) = 300 e^{ 0.000324*t}. How much radioactive carbon remains in the sample after (a) 200 years, (b) 50000 years, (c) 125500 years?
asked on March 19, 2015 
Precalculus
You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 80 p + x  380 = 0 and 84 p  x  40 = 0 Identify which is the supply curve and demand curve and the
asked on October 13, 2014 
BUS 200
You will represent a major tobacco company like R. L. Reynolds or Philip Morris. Research the issues and debate Should tobacco companies cease and desist all advertising in the US?
asked on September 14, 2011 
Calculus
Santr 109 (a fictitious substance) decays by about 6% every day. How much of a 84 pound sample remains after: (a) 7 days (b) 3 weeks (b) 48 days
asked on March 24, 2015 
Math
The Hotel Regal has 600 rooms. Currently the hotel is filled . The daily rental is $ 250 per room. For every $ 4 increase in rent the demand for rooms decreases by 4 rooms. Let x = the number of $ 4 increases that can be made. What should x be so as to
asked on September 22, 2014 
Math
A rectangular field is to be subdivided in 6 equal fields. There is 1200 feet of fencing available. Find the dimensions of the field that maximizes the total area. (List the longer side first) Width = feet Length = feet What is the maximum area ? Area =
asked on September 22, 2014 
Math
A ball is thrown up at the edge of a 550 foot cliff. The ball is thrown up with an initial velocity of 87 feet per second. Its height measured in feet is given in terms of time t, measured in seconds by the equation h = 16 t^2 + 87 t + 550 a. How high
asked on September 16, 2014 
social studies,managnent
Group 1 will represent a major tobacco company like R. J. Reynolds or Philip Morris. . Topic that will be debated is: Should tobacco companies cease and desist all advertising in the United States? Each group should thoroughly research the issues, and come
asked on September 26, 2011 
Culc please help
Using the left endpoint with n = 3, approximate the area of the region bounded by f(x)=3x^2+3 and the xaxis for x between 4 and1
asked on May 16, 2015 
precalculus
You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 45 x^2  74.5199999999995 x + 15921.36  1224.72 p = 0 and 54 x^2 + 1743.12 x + 13880.16  6940.08 p = 0
asked on October 14, 2014 
math
t has been discovered in a certain state that the relationship between the number of snow shovels demanded varies linearly with its price. When the price per item was $ 38 ,2200 items were demanded; When the price was $ 49 , 2125 items were demanded.
asked on October 13, 2014 
managment
Group 1 will represent a major tobacco company like R. J. Reynolds or Philip Morris. . Topic that will be debated is: Should tobacco companies cease and desist all advertising in the United States? Each group should thoroughly research the issues. You will
asked on September 27, 2011 
social studies
a. So with almost no impact on its sales and little concern amont its customers, should Walmart take on its critics and ight back, or shoul it focus on its business and let its results speak for themselves? b. What should Walmart do, if anything, in
asked on September 14, 2011 
precalculus
It has been found that the supply of lamps varies linearly with its price. When the price per item was $ 94.67 ,64 items are supplied; When the price was $ 134.67 , 124 items are supplied. How many lamps are supplied when the price per item is $ 118.00 ?
asked on October 14, 2014 
precalculus
The Hotel Florence has 550 rooms. Currently the hotel is filled . The daily rental is $ 700 per room. For every $ 14 increase in rent the demand for rooms decreases by 7 rooms. Let x = the number of $ 14 increases that can be made. What should x be so as
asked on October 13, 2014 
math
You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 80 p + x  380 = 0 and 84 p  x  40 = 0 a. Identify which is the supply curve and demand curve and the
asked on October 13, 2014 
Math
Find the vertex of the parabola y = f(x)= x^2 + 8 x  11 x coordinate = y coordinate = Graph this function and estimate the x intercepts to the nearest tenth. Give your answers in order. x intercept one = x intercept two =
asked on September 22, 2014 
Math
The profit in dollars in producing x items of some commodity is given by the equation P =  37 x^2 + 1073 x  7548 . How many items should be produced to break even? (If there are two breakeven points, then enter the smaller value of x. Your solution may
asked on September 16, 2014 
Math
Wile E. Coyote catapults himself off of a 500 ft. cliff with an initial velocity of 20 ft/sec. His height t seconds after catapulting is given by the function h(t) = −16t2 + 20t + 500 . (Note the yintercept of (0, 500). a. Find his maximum height (Hint:
asked on September 12, 2014 
social studies,managnent
Toyota used to sit on top of the world. It basked in the reputation of building highquality cars efficiently. It enjoyed unprecedented growth, even surpassing General Motors as the largest car manufacturer in the world. But all of that came tumbling down
asked on September 26, 2011 
Physics
When a certain spring is stretched beyond its proportional limit, the restoring force satisfies the equation F=kx+βx^3. If k=8.5 N/m and β=105 N/m^3, calculate the work done by this force when the spring is stretched 0.114 m. My attempt: F=
asked on February 23, 2011 
STATISTICS
Here is the problem: (A) Select a random sample of 30 student from our population (we have a data entry to get the sample from). At the 0.05 level of significance is there evidence that the average travel time is greater than 45 minutes? (B) What
asked on December 16, 2007 
Math
(a) Find the present value of $ 4600 per year flowing uniformly over a 10 year period if it earns 5.3 % interest compounded continuously. (b) What is its final value?
asked on May 10, 2015 
math
If 50100 dollars is deposited in an account for 14 years at 5.35 percent compounded continuously , find the average value of the account during the 14 years period.
asked on May 10, 2015 
Math
Determine whether the given equation is a circle, a point, or a contradiction (no real graph). x^2 + y^2  2 x  16 y + 52 = 0 . The equation is a . (Enter "circle", "point", or "contradiction" in the answer space without quotes.)
asked on September 24, 2014 
Math
At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
asked on September 15, 2014 
algebra
1. √(x + 6) = 8 x=? 2. 4√(2x  3) < 12 solve the inequality 3. 4 ≥ √(6x  12)  8 solve the inequality 4. √(3x  5) = x  3 x=? 5. √(4  x) ≥ √(3x + 4) solve the inequality 6. x + 3 = √(5x + 4) + 1 x=?
asked on January 4, 2010 
social studies
what gift from the 1970 christmas book gave new meaning to bathroom oasis
asked on November 30, 2006

science
Answer is B
posted on June 26, 2016 
Statistics
8/sqrt(81)=8/9=0.89
posted on October 27, 2015 
Indentifying Fallacies
false cause
posted on September 9, 2015 
Math
Consider the following sum 1/4*5+1/5*6+1/6*7+ ...+1/18*19 If it were written in sigma notation as a= b= f(i)=
posted on May 15, 2015 
chemistry
delta E = w + q q=570 J V1 = 0.12 L V2 = 0.88 L delta V = 0.88 L  0.12 L = 0.76 L w = P x delta V w = 1.0 atm x 0.76 L = 0.76 L atm You need to convert L atm to J 0.76 L atm / 1 L atm x 101.3 J = 76.99 J delta E = 76.99 J + 570 J = 493 J Mastering
posted on April 8, 2015 
Math
i just did it Q(200) = 300 e^(0.000324*200) = 281.176 But for b) and c) web work doesn't accept my answers Q(50000) = 300 e^(0.000324*50000) = 0.000028 maybe i should multiply by something...
posted on March 20, 2015 
precalculus
thank you
posted on October 14, 2014 
math
thank you so much!!!
posted on October 13, 2014 
precalculus
thank you
posted on October 4, 2014