Thursday

August 27, 2015
Total # Posts: 37

**Calculus**

A farmer wants to build a rectangular pen and then divide it with two interior fences. The total area is to be 2484ft^2. The exterior fence costs $18.00 per foot and the interior fence costs $16.50 per foot. Find the dimensions of the pen that will minimize the cost. What is ...
*July 15, 2012*

**Calculus**

Thank you!!
*July 15, 2012*

**Calculus **

Zoe purchased a house in 1999 for $196,000. In 2004, she sold the house and made a net profit of $80,000. Find the effective annual rate of return on her investment over the 5-year period. (Round your answer to the nearest hundredth of a percentage point.)
*July 15, 2012*

**Calculus**

Doing homework with James, thanks!
*July 15, 2012*

**Calculus**

Paying in cash. Thank you!
*July 15, 2012*

**Calculus**

Denominator
*July 15, 2012*

**math **

stacy multiplied 5x9 andand said the answer was 44. what two patterns could you use to show that her answer is not correct?
*November 28, 2011*

**Math**

A hurricane wind blows across a 6.00 m times 15.0 m flat roof at a speed of 190 km/hr. What is the pressure difference? Use 1.28 kg/m^3 for the density of air. How much force is exerted on the roof? If the roof cannot withstand this much force, will it "blow in" or &...
*August 15, 2011*

**Math **

A hurricane wind blows across a 6.00 m times 15.0 m flat roof at a speed of 190 km/hr. Is the air pressure above the roof higher or lower than the pressure inside the house? Explain. Need help
*August 14, 2011*

**Please help!**

I really dont understand this
*August 14, 2011*

**Physics help**

A gas sample enclosed in a rigid metal container at room temperature 20C has an absolute pressure p_1. The container is immersed in hot water until it warms to 40C. What is the new absolute pressure p_2? Express your answer in terms of p_1. I was told to use p_1/T_1=p_2/T_2 I ...
*August 14, 2011*

**Physics**

A gas with initial conditions p_i, V_i, and T_i expands isothermally until V_ f=6 V_i. What are (a) T_f and (b) p_f? in terms of T_f/T_i and P_f/P_i First I dont understand what this is saying at all. And Second I need to know how to solve it.
*August 13, 2011*

**Physics**

Thank you! That really helped!
*August 12, 2011*

**Physics**

1.9 mol of gas at a temperature of -180 C fills a 3.4 L container. What is the gas pressure? Never been good at physics or mol stuff, how do you set it up?
*August 12, 2011*

**HELP!**

I dont have any other information though except for what is in the original question.
*July 28, 2011*

**Physics**

A block attached to a spring with unknown spring constant oscillates with a period of 7.0 s. Parts a to d are independent questions, each referring to the initial situation. What is the period if... The mass is doubled? The mass is halved? The amplitude is doubled? The spring ...
*July 28, 2011*

**Chemistry**

A compund containing elements A and B has the formula A3B. If a jar containing 100 molecules of the compound A3B, how many atoms of type A are in the jar?
*January 7, 2011*

**5th grade**

What do enzymes do in digestion?
*October 29, 2010*

**7th Grade Math**

z/6 + 11 > -49 This is my problem for homework and I don't know how to do it. My teacher showed us but I guess it didn't get throw to me. ?????????????? Help
*November 19, 2008*

**7th grade**

Ra was a sun god. He took on many of the attributes and even the names of other gods as Egyptian myths evolved. A good example of this is the god Ra and Amun merging to become Amun-Ra or Ra and Horus combining to become Ra-Harakhte. Since Ra was a god of great antiquity, there...
*November 18, 2008*

**math**

take two divded by three
*November 15, 2008*

**History**

Why was an entirely new consitution needed according to Publius?
*November 15, 2008*

**7th grade pre algebra**

z/6 + 11 > -49 This is my problem for homework and I don't know how to do it. My teacher showed us but I guess it didn't get throw to me. ?????????????? Help
*November 6, 2008*

**CHEMISTRY**

thanks!
*January 29, 2008*

**CHEMISTRY**

1.5748(0.944-1.8447Y/1.5377) + 1.90293Y = 0.953 -.4026 Y + 1.90293 Y = 0.953 1.50033 Y = 0.953 Y=.6352 1.5377 X +1.8447(.6352) = 0.944 1.5377 X +1.1717 = 0.944 1.5377 X = -.2277 X=-.148078
*January 29, 2008*

**CHEMISTRY**

I see you took my advice literally about carrying extra places. It isn't necessary to use ALL of those numbers that show up on your calculator. I think 1.5377X + 1.8447Y = 0.944 will be quite sufficient and I suspect even one number fewer still will work ok. As for making ...
*January 29, 2008*

**CHEMISTRY-For Dr.Bob**

thank you so much for all of your help!
*January 29, 2008*

**CHEMISTRY-For Dr.Bob**

thank you, here is what i have. X(1.53768425g)+Y(1.844680696g)=0.944g X(1.574765922g)+Y(1.902934537g)=0.953g to solve this i know i need to use a system of equations, but i'm having trouble setting the coefficients to equal each other.
*January 29, 2008*

**CHEMISTRY-For Dr.Bob**

thank you so much for your help. this is what i have thus far: X(331.74g/2*107.87g) + Y(253.33g/137.33g)=0.944g which is: X(1.54g)+Y(1.84g)= 0.944 is that correct? how would i solve for the nitrates? we didn't measure each one separately--we measured the original sample. ...
*January 29, 2008*

**CHEMISTRY-For Dr.Bob**

My chem class just finished a lab in which the objective was to find the percentage of silver and barium in a nitrate salt mixture by precipitating the chromates, separating out the precipitate from the solvent and spectator ions via filtration, and analysis of the combined ...
*January 29, 2008*

**CHEMISTRY**

My chem class just finished a lab in which the objective was to find the percentage of silver and barium in a nitrate salt mixture by precipitating the chromates, separating out the precipitate from the solvent and spectator ions via filtration, and analysis of the combined ...
*January 28, 2008*

**Contemporary History**

thank you!
*January 28, 2008*

**Contemporary History**

i have to write two papers, one about the causes and the other about the effects of world war II. how can i structure them so that i score well?
*January 28, 2008*

**Chemistry**

thank you!
*January 12, 2008*

**Chemistry**

I'm having a hard time getting started studying for my chemistry midterm. i'm kind of overwhelmed. my teacher gave me a brief study guide, but where would be the best place to start? are notecards effective for studying chemistry?
*January 12, 2008*

**Reading**

The Great Depression http://encarta.msn.com/encyclopedia_761584403/Great_Depression_in_the_United_States.html
*March 26, 2007*

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