Saturday

October 10, 2015
Total # Posts: 77

**chem**

A 0.167-g sample of an unknown compound contains 0.00278 mol of the compound. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O. 1.)Determine the molecular formula of this acid. 2.)Determine the molar mass of the unknown acid.
*November 2, 2014*

**Algebra1**

-3|2x+6|=-12 How to solve for x, I relley need help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*September 17, 2014*

**Pre-Calculus**

I've tried to simplify this a million different ways, but I can't seem to get the right answer. Please help. ((1/(x+h)^3)-(1/x^3))/8h
*September 18, 2013*

**PHYSICS**

An airplane is flying straight and level at a speed vo = 150 mph and with a constant time rate of increase of speed v' = 20 ft/s^2, when it starts to climb along a circular path with a radius of curvature p = 2000 ft. The airplane maintains v' constant for about 30s. ...
*July 9, 2013*

**Art Please check answers**

Miss Sue are this right?
*June 2, 2013*

**Art Please check answers**

Are this right?
*June 2, 2013*

**Art Please check answers**

Are this righ?
*June 2, 2013*

**Physics**

Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.336 kg and a speed of 1.16 m/s. Cart 2 has a mass of 0.634 kg. What speed must cart 2 have if the total momentum of the system is is to be zero? What is the system's kinetic energy?
*November 5, 2012*

**7th grade math**

-1.4 > or < than 2 3/4
*September 4, 2012*

**math**

Which describes this type of series? -20 - 18 - 15 - 11 … I think it is both arithmetic and geometric
*March 22, 2012*

**Math Help**

-9-(-1) please help me solve with explanation
*November 18, 2011*

**Learning**

-9-(-1)
*November 18, 2011*

**Chemistry**

a middle-aged man has been diagnosed as being at high risk group of developing Coronary Artery Disease. Distinguish between the good and bad forms of this sterol. 'Explain the function of the good form of this sterol in the body. List the food groups that are the sources ...
*September 24, 2011*

**Chemistry**

Discuss in detail, the role played by DNA andRNA in genetic diseases. what are the breakthroughs, if any, in the treatment/management of genectic diseases?
*September 12, 2011*

**Chemistry**

a girl is celebrating her 7th birthday. each guest is served one large slice of choclate cake, a hamburger, french fries, and some oranges. identify the food groups mentioned above. if one slice of chocolate cake contains 35g of carbohydrate, 15g of fat and 5g of protein, ...
*September 12, 2011*

**Chemistry**

differentiate alkenes and alkynes, cis isomers and trans isomers. Describe how cis-trans isomers are used for night vision
*September 10, 2011*

**Chemistry**

the managing director of a well-known company on wall street thrives on a diet of fruit jam, bread, pasta, and coffee. She exercises intermittently. One day she decides to to her primary healthcare provider for a routine checkup. The healthcare provider recommends that she ...
*September 10, 2011*

**Chemistry**

What are the various uses of radioactivity in healthcare? What are the future trends in healthcare with respect to the use of radioactivitiy?
*August 28, 2011*

**Chemistry**

state three examples each of acids, bases,and salts commonly used in thera peutic processes. From the examples you state, select one acid, one base and one salt and describe how and where they are useed in therapeutic processes.
*August 23, 2011*

**Chemistry**

A 55 year old woman visits a popular eatery for lunch. She orders a cheese pizza and bacon pizza with extra cheese and has about 3 large glasses of cola (ph value 3). On the way back home she experiences heartburn and abdominal pain, and has diffigulty breathing. She drinks a ...
*August 22, 2011*

**Chemistry**

a 40-year-old manger at a prominent legal firm in L.A experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He evevtually decides to get himself examined. While questioning him, you learn that he consumed...
*August 21, 2011*

**Chemistry**

could u plz give me alittle more help on the fist question.This is the proplem that is holding me back. I'd really appreciate your time and effort to answer this question
*August 15, 2011*

**Chemistry**

a freshmann is currently enjoying the arts studio program she is pursuing at a well know university. In her free time she likes to skate,take salsa dance lessons, and cook. She particularly enjoys and decides to pickle olives to the rescipe, she needs to add 3 teaspoons of ...
*August 15, 2011*

**Chemistry**

A robust first grader goes for swimming lessons three times a week,and he enjoys it thoroughly.During the first week of December, he develops an upper respiratory infection, starts coughing continuosly, and has a high fever of 39ºC. His condition remains the same after ...
*August 7, 2011*

**intermediate algebra**

rewrite with positive exponents. Assume that even roots are nonnegative quanities and that all denominators are nonzero. [3/ua^2)^-4
*August 3, 2011*

**intermediate algebra**

SOLVE BY FACTORING 2a^2-3a=-5
*August 3, 2011*

**intermediate algebra**

can you please help find the solution to this equation. Your help would be greatly appreciated
*August 2, 2011*

**intermediate algebra**

Rowing. Abby rows 10km. upstream and 10km. back in a total time of three hours. The speed of the river is 5km./h. Find Abby's speed in still water.
*August 2, 2011*

**intermediate algebra**

Express in terms of i. 2 divided by sqrt.,-36
*August 2, 2011*

**intermediate algebra**

Given the quadraticf(x)=x^2-14x+49, find a value of x such thatf(x)=36
*August 2, 2011*

**intermediate algebra**

Express in terms of i. 2sq.rt.divided by-36
*August 2, 2011*

**intermediate algebra**

use polynomial long division to divide 25x^3+40x^2+25x+10 by -5x^2-3x-2
*August 2, 2011*

**intermediate algebra**

Subtract. (5x^6+9x^4-2x^3-3)-(8x^6-8x^5+x^4-4)
*August 2, 2011*

**intermediate algebraDivide**

Using polynomial long division to divide. 25x^3+40x^2-25x+10 by -5x^2-3x-2
*August 1, 2011*

**intermediate algebra**

use thr discriminant to determine wheather the following equations have solutions that are two different rational solutions;two different irrational solutions; or two imaginary solutions.8x^2+7x+3=0
*August 1, 2011*

**intermediate algebra**

I understand where I should what from where plz help me out. It would really be appreciaeted.
*August 1, 2011*

**intermediate algebra**

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions,state this. 3x+7y=77 -2x+7y=42
*August 1, 2011*

**intermediate algebra**

rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero. [3}^-4 --- ua^2}
*July 30, 2011*

**intermediate algebra**

Solve using the elimination method. Show all work. If the system has no solution or an infinite number of solutions, state this. 3x+7y=77 -2x+7y=42
*July 30, 2011*

**intermediate algebra**

Solve uing the subtitution method. Show your work. If the system has no solution or an infinite number of solutions, stat this,3x-15y=-12 3x+24y=-12
*July 30, 2011*

**intermediate algebra**

if a stone is tossed from the top of a 310 meter building, the height of the stone as a function of time is given by h(t)=-9.8t^2-10t+310. where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth's...
*July 28, 2011*

**intermediate algebra**

In solving the equation (x-1)(x+2)=30. Eric stated that the solution would be x-1=30¨T¡úx=31 or(x-2)¨T30¨T¡úx=32 However, at least on of these solutions fails to work when subsitituted back into the orignal equation. Why is that? Please ...
*July 28, 2011*

**intermediate algebra**

compleletly factor the following expression 9y^2-16z^2
*July 26, 2011*

**intermediate algebra**

factor out the greatest common factor from the expression 6x^3yz^4-3x^2y^3z^4-18^4y^2z^3
*July 26, 2011*

**intermediate algebra**

factor out the greatest common factor from the expression 24xyz^2+20x^2yz-4x^2z^2
*July 26, 2011*

**intermediate algebra**

completely factor the expression 150x^2-420xy+294y^2
*July 26, 2011*

**algebra**

factor the expression a^2-6ab+9b^2 into a product of binomials
*July 25, 2011*

**algebra**

factor out the greatest common factor from the expression 18x^5+48x^2-30x
*July 25, 2011*

**algebra**

use the "difference of squares" rule to factor the following expression. x^2-81
*July 25, 2011*

**algebra**

factor out the greatest common factor from the expression. 18x^7-14x^2
*July 25, 2011*

**algebra**

Factor the expression 25x^2-60xy+36y^2 into a product of binomials.
*July 24, 2011*

**algebra**

The area of a rectangular athletic field is represented by the expression 81y^2-16z^2 square meters. Write an algebraic expression to represent one possible set of dimensions(in the sense " length times width") of the athletic field. Include correct units with your ...
*July 24, 2011*

**algebra**

Andrew factored the expression 20x^3-12x^2+8x as 4x(5x^2-12x^2+8x). But when Melissa applied the distributive law and multiplied out 4x(5x^2-12x^2+8x),she got 20x^3-48x^3+32x^2; thus, Andrew's solution does not appear to check. Why is that? Please help Andrew to understand...
*July 24, 2011*

**algebra**

plz help I'm totally lost on this one I do not even know where to begin any help would be greatly appreciated.
*July 24, 2011*

**algebra**

factor the following expression completely: 70w^3-125w^2+30w
*July 24, 2011*

**algebra**

factor completely. remember to look first for a common factor. if a polynomial is prime,state this -4t^2+64
*July 24, 2011*

**algebra**

factorcompletely. if polynomial is prime, state this 9+8t^2-18t
*July 24, 2011*

**algebra**

factor by grouping if possible and check 5x^3+4x^2-10x-8
*July 24, 2011*

**algebra**

Essay. show all work. A gardener wants to create a triangluar garden in the shape of a right triangle with shortest legth x-3y ft. and the middle length side x+6y ft. What ia an algebraic expression for the area of the garden? be sure to multiply this out and express in ...
*July 22, 2011*

**chemistry**

equilibrium CO(g)+2H2(g)<->CH3OH(g)calculate these concentrations:CO(g) in an equilibrium mixture containing 0.933mol/L H2 and 1.32 mol?l CH3OH.
*July 18, 2011*

**chemistry**

what is the percent by mass of NaHCO3, in a solution containing 20 g NaHCO3 dissolved in 600 mL H20
*July 14, 2011*

**chemistry**

At 20°C, a solution contains 120 g of NaNO3 in 100 g of water. Is this solution saturated, unsaturated, or supersaturated?
*July 14, 2011*

**Chemistry **

a sample of gas of unknown pressure occupies 0.766 L at the temperture of 298k the same sample of gas is than tested under known conditions and has the pressure of 32.6kPa and occupies 0.664 L at 303 k. What is the original pressure of gas
*July 13, 2011*

**AP US History**

Analyze the extent to which TWO of the following influenced the development of democracy between 1820 and 1840. -Jacksonian economic policy -changes in electoral politics -Second Great Awakening -Westward movement
*April 10, 2011*

**Algebra**

Write a direct algebraic proof to show that if a/b=c/d, then a+c=b+d
*April 3, 2011*

**World geography**

Midddle Ages
*March 24, 2011*

**Algebra**

How do you simplify (r+3)^3?
*February 10, 2011*

**Chemistry**

I agree with anon, tony is stupid
*November 14, 2010*

**Algebra**

The average mark on a test in an algebra class is 80. If the two lowest scores of 34 and 48 are not counted, the remaining scores would average 83. How many students are in the algebra class?
*October 28, 2010*

**Algebra**

1/5(a-2)-2/5(a-3)>2a-1/3(4+5a)
*October 28, 2010*

**algebra**

how do I simplify -2xyz^3/5x^2z^2 times 10xy/x^3
*October 27, 2010*

**Math**

Suppose that Barry Bonds has 148 hits in 500 at bats. How many hits does he need in his next 10 at bats to raise his batting average to .300?
*March 11, 2010*

**adult education**

A firm is assigned the network part 128.171. It selects an 10-bit subnet part. a) Draw the bits for the four octets of the IP address of the first host on the first subnet.
*November 7, 2009*

**7th grade math**

He has 13 weeks with some extra money left over!!!
*August 25, 2009*

**Math**

The mean height is 5 ft 4 in. How many students are in the class?
*May 11, 2009*

**Biology**

This is my question from my Biology paper. List which organs and tissues come from the mesoderm primary cell layer. Thanks
*October 16, 2008*

**Geomatry**

Which Solid can be defined as the regular polyhedron (a solid with all faces identical regular polygons) with the greatest number of faces? Please help thank you http://en.wikipedia.org/wiki/Regular_polyhedra There are nine regular polyhedra. Choose the one with the most faces..
*March 31, 2007*

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