Saturday
August 23, 2014

Posts by rani


Total # Posts: 36

Geomety
How do I find the image of O (0,0) after two reflections, first across x=a and then across y=b?
January 7, 2014

Physics
an object at rest explodes into three pieces of equal mass. one moves east at 20 m/s a second moves southeast at 30 m/s what is the velocity of the third piece??
December 17, 2013

math
A hobby shop has 4 times as manymodel airplanes as model helicopters.The total number of model airplanesand helicopters is 35. How manymodel airplanes does the hobby shophave?
November 6, 2013

math
beth travels 244 miles everyweek. she says she will travel 2,196 miles if she travels the same number of miles for the next 9 weeks.
November 6, 2013

chemistry (buffer)
If 5.00 mL of 1.60 nitric acid is added to a solution of 2.00 mmol thiocyanic acid (HSCN pKa=4.00) and 4.500 mmol calcium thiocyanide, assume a soluble salt- what is teh pOG of the resultant complex solution (of total volume .350L). I worked the problem out and ended up ...
May 2, 2013

physics
a body cools from 80 degrees to 50 degrees in 5 minuts. calculate what time it will take to cool from 60 degrees to 30 degrees?
March 12, 2013

Chemistry
I want to have the details of the experiment title: Determine the equilibrium constant of a reversible reaction involving the iodine and the tri iodate ion reaction and also determine the gibbs free energy of the reaction.
March 4, 2013

math
Sorry the "Total Items $$ Total" was supposed to be 3 columns.
February 6, 2012

math
Okay, I have figured this out. Total Items $$ Total Books 175-v 5 5(175-v) Videos v 6 6v Total 175 --- $910 5(175-v) + 6v = 910 875- 5v + 6v = 910 1v (or just v) = 910-875 v = 35, or 35 videos 35 videos at $6 each = $200 sold $910-200 = $710 left for books $710/$5 (books) = ...
February 6, 2012

math
Used books are being sold at $5 and used videos are being sold at $6. There are 175 total items sold and a total of $910 collected. How many videos were sold?
February 6, 2012

Math
Reasoning. If you live 71mi from a river, does it make sense to say you live about 80 mi from the river? Explain
October 16, 2011

science
unscramble ecrfenine
August 23, 2011

MATH grade 12
Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!
February 27, 2011

advance functions
Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!
February 27, 2011

Chemistry
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 55.6 kJ of heat. Before the reaction, the volume of the system was 7.60 L. After the reaction, the volume of the system was 2.00 L. Calculate the total internal energy change, Delta U, in kilojoules.
October 31, 2010

Chemistry
In lab we did thermochemistry, where we are supposed to find the heats of solution, heat change of calorimeter and molar heat solution of the salt. I calculated that the calorimeter constant for the water we had was 883.194 Joules. We took 1/10 of a mole of NH4Cl and tried to ...
October 31, 2010

maths
if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cos^2theta)(1+cos-^2theta) the answer should be 49/64 but i couldnt get that answer. can any one help?
July 1, 2010

maths
if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cost^2theta)(1+co-^2theta) the answer should be 49/64 but i couldnt get that answer. can any one help?
July 1, 2010

PHYSICS-radiation
Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80...
January 24, 2010

MATH/SCIENCE HELP
PROBLEMS: 1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: - The depth (amount) of rain that fell (in mm). - The intensity (mm h-1...
October 23, 2009

MATH/SCIENCE HELP
A)The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at which the rain fell. c. The volume (m3) of water that would have fallen on an area of 7.00 acres. d. The discharge in m3 s-1 that would occur if all the water ran off the area in part c. in 3.00 hours...
October 23, 2009

MATH/SCIENCE HELP
1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: a. The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at ...
October 23, 2009

Science!! Please HELP
If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this ...
October 7, 2009

Science!! Please HELP
If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this ...
October 6, 2009

Chemistry...Please Help
hi
January 6, 2009

Math - please elaborate
can someone please further explain my question on? it's just a farther bit down. The subject is "Math - help really needed" I think I almost got the answer, but I'm not sure where to go from there. really appreaite all the help so far as well; thank you. :)
December 2, 2008

Math - help really needed
I haven't learned what cot and csc are. Can I still solve this with just tan, cos, and sin?
December 2, 2008

Math - help really needed
but if I have identical denominators, why can't I just add the 1 to the tan^2X?
December 2, 2008

Math - help really needed
I'm really sorry. I don't want to sound stupid, but when I add tan^2x/tan^2x to 1/tan^2x I get 1+tan^2x/tan^2x and then the tans cancel out and I'm left with just one. Obviously, that's not correct, but I can't find my mistake.
December 2, 2008

Math - help really needed
okay, I'll try it out, thank you.
December 2, 2008

Math - help really needed
wait, for the first one if sin^2+cos^2=1, how did you even cancel some out?
December 2, 2008

Math - help really needed
oh, ok, I see. thank you all very much. I think I get it now, so hopefully I can actually get them on my own. :)
December 2, 2008

Math - help really needed
I'm sorry to double post; I don't want to seem impatient, but I really need help with this. Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten...
December 2, 2008

Math - help really needed
Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten 'round to sny of the quedtions because the first one is just so hard. I'm not really sure I...
December 2, 2008

math
15 percent of 50
March 26, 2008

acids and alkalis
Pls help me. Pls tell me some bases (alkelis)other than any cleaning products.
November 4, 2006

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