Friday
November 21, 2014

Posts by bex


Total # Posts: 89

Calculus
I meant W=10, L=20
June 6, 2014

Calculus
Given the area of a rectangle is A = LW. If three sides of the rectangle are fixed, I.e. 2W + L = 40, find L and W such that you maximize the area of the rectangle. Is it L=10, W=20?
June 6, 2014

Calculus
A square with side x cm, is changing with time where x(t) = 3t + 1. What is the rate of change of the area of the square when t = 2 seconds?
June 6, 2014

Calculus
A rectangular box has a square base whose edge has length at least one centimeter, and its total surface area is 600 cm2. What is the largest possible volume that such a box can have? V = 500 in3 V = 750 in3 V = 900 in3 V = 1,000 in3
June 3, 2014

calculus
A region is bounded in the second quadrant by the curve y = ln(1–x), the line y=3, and the y-axis. Find the area of the region.
May 22, 2014

Calculus
Jill burns 100 calories per hour while sleep and 300 calories per hour while walking and 200 calories per hour at work. If in a typical day Jill spends 7 hours sleeping, 2 hours walking and 6 hours working, what is her average calories burned for those hours? 166.67 cal/hr 200...
May 22, 2014

Calculus
Evaluate the integral of 4x^2(2+x^3)^9 dx. I'm supposed to use the substitution rule but I have absolutely no idea where to start with this problem.
May 20, 2014

AP Literature
Identify the figure of speech in this sentence: "Anyone who calls a spade a spade should be compelled to use one." --Oscar Wilde Simile Metaphor Personification Analogy Hyperbole None of these I'm torn between personification and none of these, however I'm ...
April 30, 2014

Calculus
What are two conditions that must be met before the Extreme Value Theorem may be applied?
April 8, 2014

Calculus
it approaches positive and negative infinity?
April 8, 2014

Calculus
What is the end-behavior asymptote for f(x)=(x^2+4x-5)/(x-2) ? There is an oblique asymptote at y=x+6 and a vertical asymptote at x=2. Is one of those the end-behavior asymptote?
April 8, 2014

Calculus
is it y=2x^2 -4x+14 ?
April 4, 2014

Calculus
Find the polynomial end-behavior asymptote in the graph of f(x)=(2x^3 +6x-1)/(x+2)
April 4, 2014

Calculus
If y = y(x), write y’ in Leibniz notation.
April 2, 2014

Calculus
If g(x) = a f(x); find g’(x). Is it g'(x)=af?
April 2, 2014

Math
Sarah has an 86% average on her 1st 5 tests. If she gets a 92 on her next test, what will her average be then?
May 6, 2012

*Science*
i wld keep it as " meteorite" (sorry for the confusion)
February 17, 2010

*Science*
which definition?
February 17, 2010

*Science*
a meteorite is a stony or metallic object that is the remains of a meteoroid that has reached the earth's surface
February 17, 2010

geography
how has the geography and history of the South helped create a diverse population that continues to grow?
February 17, 2010

Geography
i think its C...but i cld be wrong
January 11, 2010

science
its called weathering - we just did it in science. you get 3 types: biological, physical and chemical weathering.
September 29, 2009

English
How does Arthur Miller manage to create tension in Act Two of ''A View From The Bridge''? d how does act two reflect all the main themes in the play? I'm terrible at writing essays and I really need help! i'm not asking you to write it for me, just a ...
September 25, 2009

Physics
oh, okay, hank you so much!
February 3, 2009

Physics - urgent
Please, please, I really need gelp for this.
February 3, 2009

Physics
a bowling ball is thrown down from the top of a building at 20 m/s. Find the distance the ball travels in A) 1 s B) 3 s should I make the 20 m/s negative? I'm assuming the ball is just being thrown stright down... I'm using the formula d=V(initial)*t+1/2a*t^2 I'm ...
February 3, 2009

business
why must stock control be closely monitered ?
October 6, 2008

Algebra 2 honors
sorry.im not very good at algebra =[
September 10, 2008

Algebra 1 honors
.09x+.08x(30)= $1380 + $6400 = ? ......i think/hope that this is right....
September 10, 2008

ecosystems
please help me!
September 10, 2008

ecosystems
How are the flow of matter and the flow of energy through ecosystems different?
September 10, 2008

math
suppose x S f(t) dt= x^2 - 2x + 1. Find f(x). 1 S = integral and 1 = lower level, x = upper i don't understand what i'm supposed to find/what to do and i didn't make any typos.
December 1, 2007

calculus
suppose x S f(t) dt= x^2 - 2x + 1. Find f(x). 1 S = integral and 1 = lower level, x = upper i don't understand what i'm supposed to find/what to do
November 30, 2007

physics
a 70 kg rope climber starts from rest, moves with constant acceleration, and climbs 9 meters up a rope having a maximum strength of 840 N. What is the greatest possible speed she can have afte climbing 9m?
November 27, 2007

history
i don't get this quote. can someone please explain? who is they? "there is also the difference between merchants barely tolerated by a centralized empire and those whose rulers and governments used them for their imperial cause... they could, in terms of ...
November 26, 2007

earth clay
could you tell me how clay plays a cruial part in the origin of life This site should help you: http://en.wikipedia.org/wiki/Origin_of_life#Clay_theory
May 23, 2007

science
could someone please help me i have to write about the start of life on a extrasolar planet and talk about chemical evolution,, could someone please give me some pointers Is this S103 ECA? yes it is im just need some pointers so that i can do the work in my own words but i ...
May 18, 2007

maths equations
could you please help me on this equation r = sx2/2t im really stuck Your non-use of parenthesis makes in difficult to know what the equation is. What are you trying to do with the equation? sorry im trying to make x the subject divide each side by s r/s= x^2 /2t multiply each...
May 13, 2007

solar science
could you give me any ideas on the stages of chemical evolution that would need to occur towards the development of life and the timescales many thanks http://en.wikipedia.org/wiki/Origin_of_life http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=origin+...
May 13, 2007

chem equations
could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is 2CH4+2NH3+3O2--&...
May 6, 2007

science
could someone please crique this algebra x must be the subject 6y = 9 - 3x 3x = 6y + 9 x = 2y + 3 is this correct please Add 3x to each side.Giving 6y+3x=9. Subtract 6y from each side.Giving 3x=9-6y. Divide each side by 3.Giving x=(9-6y)/3. Divide numerator by 3. Giving x=3-2y.
May 6, 2007

science geo
I have to write a brief geological history of a region starting with the oldest events schist being the earlisest and then i have sandstone and gabbro, could you see if what i have wrote is correct The schist would have probably originally been deposited first as a layer of ...
April 20, 2007

geo/science
I have to write a brief geological history of a region starting with the oldest events with schist being the oldest it says i should not speculate but concentrate on the evidence have what i wrote on the right lines if not can you give me some pointers The schist would have ...
April 20, 2007

geo/science
is sandstone a sedimentary rock that consists of minerals of quartz and feldspar, does it have any other minerals. I believe it is formed by layers of sand accumulated resulting in sedimentation because the sandstone is formed when compacted under pressure. it is foliated and ...
April 20, 2007

geo/science
could you please tell me if schist is a sedimentary rock or metamorphic. Is it formed by high temperature and high pressure. I have to draw a sketch of schist would you be able to suggest a web page that shows a sketch Yes it is metamorphic.
April 20, 2007

geo/science
could you please tell me if this is the correct formula for radiometric date t=1/constant 1n (1+d/p) many thanks ps this is a fantastic website I think that you are after t=1/ë[ln(1+D/P)] where: t = age of the sample D = number of atoms of the daughter isotope in the ...
April 19, 2007

geology / science
would you be able to suggest a good website for me to answer this question granite is intrusive , felsic rock, which may be produced by partial melting or fractional crystallization, Explain how these processes produce felsic magmas from more mafic parent magmas (200 words) ...
April 18, 2007

geology / science
the age of granite can be determind using radiometric dating, explain the basis for the determination of a 238 U- Pb radiometric date of 1120 Ma for a granite. I have as the answer 238 U decays to Pb with an experimental law, that is the amount of U and Pb in granite are ...
April 18, 2007

Biology help
please can someone help i need to know the difference at telophase 2 of meiosis if their had been a crossing over at a postision halfway between the huntingtons disease genes please im finding this last question hard
April 12, 2007

Biology help
can anybody please tell me if the diagram to show anaphase 1 is a cell with the 4 genes at the top and 4 genes at the bottom, im struggling with this as there are many diagrams to choose but is this one correct mant thanks
April 12, 2007

biology
can anybody tell me what is meant by the term regulating mortality factor and how it can lead to successful biological control of pest in agriculture HI, I am doing tma 7 aswell. if you send ur email i'll send my answer to you. do you know the answer to question 3? Thanks ...
April 10, 2007

Biology
how does the structure of green cell organelles relate to the metabolic process of photosynthesis and aerocic respiration many thanks http://en.wikipedia.org/wiki/Chloroplast http://en.wikipedia.org/wiki/Light-dependent_reaction http://en.wikipedia.org/wiki/Calvin_cycle
April 5, 2007

Biology
I am given the structual formula for lactose howere i have to write out the equation for the hydrolosis of lactose is the following what is required C12H22O11 +H2O>>> C6H12O6 +C6H12O6 all the numbers are subscript, would appreciate if someone would guide me Since this...
April 4, 2007

biology
is anyone able to help i have to write 700 words on the subject of the metabolism of green plant cells in relation to energy exchange processes any guidance would be very much appreciated http://en.wikipedia.org/wiki/Photosynthesis http://en.wikipedia.org/wiki/Calvin-...
April 3, 2007

biology holly leaf miner
can anyone please explain the term regulating mortality factor (regarding the holly leaf miner )and how understanding of this can lead to successful biological control of pests in agriculture and horticulture
April 3, 2007

Biology
A mutation of c to t in position 3 and another of G to A in position 7 results in the production of a different sequence of ammino acids work out the new sequence and suggest why it might change the function of the new protein I get the sequence of ATAAGCTTT in Mrna AUAAGCUUU ...
March 25, 2007

Biology
The human gene for the production of lactose is on chromosome 2. The dna nucleotide sequence of a small part from the middle is 123456789 TACTCGGAA I haVeTO WRITe DOWN THE EQVIVALENT SEQUENCE FOR MRNA AND HENCE WORK out the sequence of amino acids coded in this part of the ...
March 25, 2007

Biology
Could anyone suggest a web site where i could get the structual formulae and the equation for the hydrolosis of lactose thanks
March 22, 2007

Biology
Could somebody check this formula for the structure of hyroloysis of lactose C12H22O11+H20 ...> C6H12O6H12O6 OBVIOUSLY THE FIGURES ARE ALL SUBSCRIPT Many thanks Is that not the molecular formulae ???
March 20, 2007

Biology
could you explain the meaning of the phrase glycoside c-1 to c-4 linkage this is in regard to the structural formula of lactose many thanks http://en.wikipedia.org/wiki/Lactose thanks that was a real great help now i understand
March 20, 2007

chemisrty
Is this the stuctual formula for hydolosis of tocainide CH3 NHCOCH^2N(C^2H^3)^2 CH3 WITH THE HEXAGON LINKING THE 2 X CH3
March 15, 2007

chemisrty
how would i draw a structual formula of the products of the complete hyrolosis of tocainide O CH3-N-C-CH-NH2 CH3 H CH IM told this is tocainide please can anybody help a distressed student the O should be over the C atom
March 15, 2007

chemisrty
hello how would i draw a monomer CH2-CHCH=CH2 I have to draw three monomer units can anyone help
March 15, 2007

chemisrty
can anybody explain why and how a copper based catalyst helps in methonal production and the impact it would have on mass production many thanks A catalyst lowers the activitation energy needed for a reaction and allows reactants to produce more products at a lower temperature...
March 14, 2007

gemma
re s103 please could you help me on that question about methonal please please help im running out of time What question? Do you mean methanol? Please post your questions with the subject appropriately labeled, and not addressed to one person.
March 13, 2007

chemisrty
Could anybody help me with this question "In practice the methanol production process is operated at temperatures of 250 to 300 degrees and at a pressure of 50 to 100 atmosphere (50 to 100 times normal atmospheric pressure) in the presence of a copper based catalyst ...
March 12, 2007

chemisrty
I have seen on the chemistry answers that a symbol is used please can you tell me what it means they are the upside v eg Na^ and CN^ It means that the number or symbol that follows is placed in the top corner of Symbol before it E.g cm^3 or CN^- you just cant write them on ...
March 12, 2007

chemistry
is NH2 an amine and classed as ammonia and is c=0 or N-H an amide any help would be appreciated http://www.onelook.com/?w=amide&ls=a RNH2 is basic and acts much like ammonia. The -CONH2 group is an amide.
March 8, 2007

chemisrty
please could you tell me how i would draw an hydrogen atom which has only one electron and describe why it has so many spectral lines, I have studied my text books but cant seem to figure it out, many thanks in advance http://images.google.com/images?&hl=en&num=10&btnG=Google+...
March 2, 2007

Dr Bob222
Can you help me with this please - Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas at a different temp? & at a different pressure? You can do this two ways. The simplest is P1V2/T1 = P2V2/T2
February 27, 2007

chemistry
I have a chemical composition of As2O3. How do I calculate the mass of oxygen that combines with 1 mol of arsenic to form the oxide of arsenic? How do I use this to obtain the empirical formula of the oxide? That IS the empirical formula of the compound. You calculated the ...
February 27, 2007

chemistry
If the arsenic is 76% and oxygen is 24% how would I calculate the chemical composition of of the oc=xide of arsenic that has been formed? Divide 76 by the atomic weight of As (which is 74.92) and 24 by the atomic weight of O (which is 16.00). The two new numbers that you get ...
February 27, 2007

chemistry
Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas? You have the volume, given. How do I calculate the volume at a different temperature?
February 27, 2007

chemistry
What evidence supports classifying H2SeO3 as an acid? In a water solution, it turns blue litmus red.
February 27, 2007

chemistry
I have a compound ch3 = ch- ch - oh ch3 the ch3 is under the first ch from the left, i have to identify the monomer unit and draw a structure showing three monomer unit any help i have a compound CH3= CH - CH - OH and another CH3 under the first CH from the left , I have to ...
February 26, 2007

chemistry
What is polymerization and what type is involved in forming a polymer when I have CH3 N CH O C and NH3 Can any one help please Polymerization is the chaining of monometers. Look for the double bond, it breaks, and forms a chain.
February 25, 2007

chemistry
the diagram below shows a structural formulae of 3 cabon compounds labelled 1 2 and 3 and the eaction between compounds 1 and 2. The equation for this reaction is incomplete only the reactants are shown, the missing products being indicatedby a? :o ch2 =ch-ch -oh + ch3 - ch - ...
February 19, 2007

chemistry
are the noble gases of NCCN cyanogen = Argon HCN hydrogen cyanide = Neon thanks I don't know how to answer this. There are 10 electrons, all bonding electrons in HCN. In the case of F, for example, we say its ion is isoelectronic with Ne; i.e., there are 10 total electrons...
February 18, 2007

physics
is this the strutual formula for hydrogen cyanide H:C:::N and is this correct for cyanogen :N:::C:C:::N any advice woulds be appreciated This is more chemistry than physics. It is important to put the subject line carefully in order for the right people to look at the problem...
February 18, 2007

chemisrty
if i am trying to find the diameter of an oil molecule and express my answer in scientific notation. the info is drop of oil 0.05 cm3 from a dropper spreads out to 40 cm2 is it vol = l x w x h 0.05cm3 = 20 x 20 xh 0.05 cm3 = 40cm2 after this im stuck as i dont know what the ...
February 17, 2007

chemisrty
which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic num 88 and mass num 226 how do i go about this please can you help If you can add you can do these. 88Ra226 ==>2X4 + zzYww. Now make the numbers add. Protons must be conserved. ...
February 17, 2007

bock 7 s103
is there anybody out there who have looked at tma 06 yet if you have could we pick each others brains lol thanks I looked up tma 06 on google and found many site regarding religion which certainly is not my field. Please clarify your question, if you still have one. If it is ...
February 17, 2007

atoms
If i was to draw a diagram of a hydrogenatom with one electron and its many spectral lines would i need to draw the BOhr model with the nucleus in the middle and 3 outer rings or have i lost the plot That is one way. Actually, there are an infinite number of stable orbits that...
February 14, 2007

physics
a drop of oil vol 0.05 cm3 is released from a medicicne dropper on to a calm surface pond where it spreads out to cover an area of 40 cm 3. Assume oil film is uniform thickness equal to diameter of oil molecule. Calculate the diameter of oil molecule and express in scientific ...
February 14, 2007

chemisrty
can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...
February 4, 2007

chem
could anyone tell me why the molecular formula of agas is not always the same as the empirical formula tnx It may be a dimer or a trimer. For example, CH is the empirical formula for acetylene but the molecular formula is HC(triple bond)CH or C2H2.
February 3, 2007

chem
hi can anyone help how do i determine the molecular formular of the oxide of arsenic in its in its gaseous state the answer i got was 17.8 gl -1 for the density, which law do i use is it boyles law or charles law thanks A mol of a gas occupies 22.4 L at STP. If it is 17.8 g/L ...
February 3, 2007

the big idea of energy
dont get it :S
December 5, 2006

acids and alkalis
- lemons contain citric acid which make them tast sour -Soft drinks contain Phosphoric acid to give thm a shrper tast and to prevent bacteria multiplying at a quicker rate -fruit jucies contain Malic acid ,,, which is found in apples and cherries dunno if this is any help but ...
November 4, 2006

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