Total # Posts: 735
A solid substance P is soluble in water (1g/100 mL) at 25 degrees and 10g/100mL of water at 100 degrees. You are given a sample that contains 10 g of P and 2g of impurity G. If G has the same solubility as P, describe how you could purify P.
October 6, 2011
For the life of me, I cannot understand this question! Will someoe please help me, explain to me how I can solve it, PLEASE! Q- a party supplies store recorded net sles of $423,400 for he year.The store's beginnng iventory at retail was $105,850 andits ending inventory at ...
August 28, 2011
The length of the smaller rectangle at the right is 1 inch less than twice its width. Both the dimensions of the larger rectangle are 2 inches longer than the smaller rectangle. The area of the shaded region is 86 square inches. What are the dimensions of the smaller rectangle?
August 4, 2011
The length of the smaller rectangle at the right is 1 inch less than twice its width. Both the dimensions of the larger rectangle are 2 inches longer than the smaller rectangle. The area of the shaded region is 86 square inches. What is the area of the larger rectangle?
August 4, 2011
I don't understand how to do this problem. Please help! Find an exponential function of the form f(x) = bax that has a y-intercept of 2 and passes through the point (2, 98). For example, if the equation is f(x) = 2(7)x respond by entering the answer as 2(7)^x
May 19, 2011
I need help understanding how to do these problems. Thanks! 1) Find the value(s) that would be left out of the range of f. If there is more than one value separate them by commas. Leave fractional answers in fraction form. If there are no values left out of the range respond ...
May 3, 2011
How would you go about solving this? Im totally confused. Thanks! Find the value of k such that the graph of f contains the given point. Write k as a simplified fraction if it is not a whole number. f(x) = kx^3 - 3x^2 + kx + 3; (-1, 8)
April 12, 2011
i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations by substitution. x^2 + y^2 = 25 x - y = 7 3) ...
April 5, 2011
X+(X-1)+(2X-5)=24 use X for the amount of outfits Jane has. you know: -that Charlie packs 1 less than Jane (x-1) -that Loretta packs 5 less than twice Jane's (2x-5) -that you can't have more than 24. so set it equal to 24 and then solve :)
March 16, 2011
The three ropes are tied to a small, very light ring. Two of the ropes are anchored to walls at right angles, and the third rope pulls as shown: F=85 N, q=54°. What is the magnitude of the tension force in the first rope
January 31, 2011
Suppose that the sales at Borders bookstores went from 70 million dollars in 1989 to 415 million dollars in 1993. What is the continuous percent growth rate, per year, of sales?
January 17, 2011
Using the formula for the area of a triangle, A = 1/2 bh, find the area of this triangle pictured. The base is 2x + 16 and the height is 4x. I just don't know how to work the problem.
January 17, 2011
5th grade math
hey i dont like math at all so i was wondering if you can do this below CONSTRUCTING A GRAPH FROM LANDMARKS mode:15 minimum:5 median:10 maximum:20 and i dont even know where to start
January 4, 2011
Mr.shafier has been teaching school for 10 years.For 6 of those years he taught 8th grade.what fraction represents the time Mr.shafier has not been teaching 8th grade?I knoe the answere is 2 5ths. but how do i show work?HELP!!!!!!!!!!!!!!!
December 12, 2010
A 250 kg car starting from rest is pushed 30m. When the car reaches 30m, its traveling at a speed of 12m/s and it encounters 52N of friction. What is the acceleration of the car and what is the force of the push on the car?
December 1, 2010
did you know when you try to find the least commen multiple of 3 numbers you have to divide by two after you get your answer my class (ms.lott in texas) told us that for some reason its doubling the number so always divide by two once you have crossed out the commen numbers ...
November 28, 2010
help please! At 2200°C, K = 0.050 for the following reaction. N2(g) + O2(g) 2 NO(g) What is the partial pressure of NO in equilibrium with N2 and O2 that were placed in a flask at initial pressures of 0.75 atm and 0.30 atm, respectively?
November 18, 2010
help please! At 5000 K and 1.000 atm, 83.00% of the oxygen molecules in a sample have dissociated to atomic oxygen. At what pressure will 99.0% of the molecules dissociate at this temperature?
November 17, 2010
I need help figuring out what this poem means. Thanks Analysis of a Sound in the Middle of the Night by Nicole Brossard time free-falling in my arms, I await night the midpoint of midnight life stretches out palm tree silence unrecognizable in the folds of representation I ...
October 24, 2010
A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edges and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry-go-round. a. what ...
October 17, 2010
A sulfur-containing compound is decomposed and the products are collected over water according to this equation: SxOy -> SO2(g) + O2(g) The mole fractions for the products are as follows: SO2 (.8) and O2 (.2) What is the empirical formula for the original compound?
October 4, 2010
Calculus ll - Improper Integrals
Find the area of the curve y = 1/(x^3) from x = 1 to x = t and evaluate it for t = 10, 100, and 1000. Then find the the total area under this curve for x ≥ 1. I'm not sure how to do the last part of question ("find the the total area under this curve for x ...
October 2, 2010
Write out the general equation: NaCl(aq) + AgNO3(aq) ---> AgCl(s) + NaNO3(aq) Write out the total ionic equation. If it's a strong electrolyte, it is written as ions. If not, it's written as a molecule. NaCl, AgNO3, and NaNO3 are strong electrolytes, so they're ...
October 2, 2010
Communication and Gender Studies
How does the English language that is spoken in the US accomplish how we portray men as serious? How do we describe them by their activities and accomplishments, particularly compared to language about women? What are the sorts of nicknames that we have for men, or the sort of...
June 24, 2010
Elective Child Daycare Management
1. Which one of the following statements uses language best to present a clear picture of a child's behavior? A. Leslie ran to the door, greeting his mother with open arms. B. Carolyn carried her books to the table. C. Marshall handed the truck to Jacob. D. Beryl chose a ...
June 18, 2010
Scientists believe that the Great Rift Valley was created by 1 volcanic eruptions. 2 tectonic forces. 3 ocean flooding. 4 receding glaciers. I think the answers either 1 or 2 which one is right?
May 18, 2010
Two moles of a nonelectrolyte solute are dissolved in 1 kg of an unknown solvent. The solution freezes at 7.8 degrees Celsius below its normal freezing point. What is the molal freezing point constant of the unknown solvent? What is your prediction for the identity of the ...
May 17, 2010