Friday
May 6, 2016

# Posts by Noelle

Total # Posts: 60

Math
A bag of balloons contains 2 red balloons, 10 green balloons, 16 yellow balloons, and 7 orange balloons. What is the probability that a randomly selected balloon would be green or orange?
March 10, 2015

Math
OK, I was having trouble my self on this but I do know it is complementary is 43 degrees and supplementary 133 degrees.
February 25, 2015

math
if what you say about their approaching rate is true, jim ran 8 * 5/18 = 20/9 miles
September 9, 2014

Chemistry
If a solution containing 118.44 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the reaction?
April 1, 2014

Chemistry
I'm so confused...how do I use the coefficients to balance the equations?
October 7, 2013

Chemistry
In the following reaction, 451.4 g of lead reacts with excess oxygen forming 313.6 g of lead(II) oxide. Calculate the percent yield of the reaction. 2Pb(s)+O2(g)= 2PbO(s)
October 7, 2013

Chemistry
Balance the redox reaction: Ag(aq)+Cu(s)= Ag(s)+Cu(aq)
October 7, 2013

Chemistry
For the following chemical reaction, what mass of silver nitrate in grams will be needed to produce 3.91 mol of calcium nitrate? CaI2+2AgNO3=2AgI+Ca(NO3)2
October 7, 2013

Math
25. Edith earns an annual gross salary of \$17,500. She has 28% of her gross salary withheld for taxes and other deductions. What is the net pay of each paycheck if she is paid weekly? \$274.04 \$43.87 \$242.31 26. Franklin deposited \$1,400 in a savings account that accrues simple...
May 14, 2013

algebra
Well it's the reflect across the x-axis, translate 2 units to the left, translate down 2 units, stretch by the factor of 2..
October 29, 2012

physics
a: 9.8 t: 2.6 v: 2.11 d: ? d=vt+1/2at d=(2.11)(2.6)+2(9.8)(2.6) d=ANSWER
October 21, 2012

science
D: density M: mass V: volume D=M/V therefore, the density is 64/16=4
October 21, 2012

algebra
Solve -3(5x+6)=57
May 21, 2012

algebra
Solve -3(5x+6)=57
May 21, 2012

statistics-math
The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? ( /2)
November 9, 2011

physics
A block of wood is placed in a cup of water. The block has the following dimensions: L=10cm W=5cm H=4cm. If the block is 75% submerged, how much water has been displaced?
June 15, 2011

Science 7
One ohm is the resistance value through which one volt will maintain a current of one ampere.
June 15, 2011

Chemistry
Flask a contains 2 liters of ch4 (g) and flask b contains 2 liters of 02 (g) each gas sample has the same 1) density 2) mass 3) number of molecules 4) number of atoms
February 16, 2011

math
1/2, 4/8, 5/10 (all you have 2 do is multiply or divide both the numerator and denominator by the same # and you get your equivalent fractions.
February 16, 2011

chemistry
how many grams of oxygen are in 560g of ribose?
February 15, 2011

Math
Im in advanced math and were doing Graphing Inequalities and im not sure how to do it.
November 28, 2010

physics
How would you find the coefficient of kinetic friction if you're given a weight of 627 N and theta=45 degrees?
November 23, 2010

social studies
Type this into Wikipedia: European colonization of the Americas
October 27, 2010

math
All you have to do is divide both sides by -5. You will get -1/7 because when you divide the right side by -5, the 5's cancel out to leave you with -1 on top. Let me know if you have more questions.
October 27, 2010

math
Like this: 5/8 * 7/2 So, you multiply the two top numbers (5*7) and the two bottom numbers (8*2) to get the final answer for a.
October 27, 2010

math
1,2,and 3 are right. 4. You need to multiply each side by the opposite. So to cancel out 2/7 on the left side, multiply by 7/2 to get a by itself. Then you have to multiply the right side by 7/2 also. Multiply 5*7 to get the top and 2*8 to get the bottom. Let me know if you ...
October 27, 2010

What exactly is the question?
October 27, 2010

substitution method
Okay so on the first side you have 3 which needs to be distributed to both the 31 and the -6y. On the left side you will end up with 93-18y+8y=33. Now you have to finish solving for y. Add 8y to -18y then subtract 93 from both sides. I think you can take it from here. Let me ...
October 27, 2010

math
This is very simple. All you have to do is put what is equal to x in the second equation (31-6y) in for the x in the first equation giving you the equation 3(31-6y)+8y=33 Solve for the y with this equation then plug that answer into either of the equations to get x. Let me ...
October 27, 2010

2r-5s=-12 5r+2s=57 2r-5s=-12 +5s=+5s 2r=5s-12 /2=/2 r=(5/2)s-6 Now that you know r, plug that into the other equation and solve for s. Once you know s, you can plug s into either equation to get r.
October 27, 2010

You need to solve for one variable in one equation first. The easier one would probably be the first equation. Solve for r by adding 5s to both sides (which cancels 5s on the left side) then divide everything by 2. Plug that answer in for r in the second equation. Let me know ...
October 27, 2010

Chemistry
Radiation in the ultraviolet region of the electromagnetic spectrum is quite energetic. It is this radiation that causes dyes to fade and your skin to develop a sunburn. If you are bombarded with 1.00 mol of photons with a wavelength of 288 nm, what amount of energy, in ...
October 27, 2010

Chemistry
Suppose you are standing 201 m from a radio transmitter. What is your distance from the transmitter in terms of the number of wavelengths for the following conditions? (a) The station is broadcasting at 1150 kHz (on the AM radio band)? (1 kHz = 1 multiplied by 103 Hz.) ?? ...
October 21, 2010

Chemistry
Sulfur (3.26 g) is burned in a constant volume calorimeter with excess O2(g). The temperature increases from 21.25°C to 28.22°C. The bomb has a heat capacity of 923 J/K, and the calorimeter contains 815 g of water. Calculate ΔU per mole of SO2 formed, for the ...
October 19, 2010

Chemistry
When 112 g of water at a temperature of 22.5°C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is 46.3°C. What was the initial temperature of the second sample of water?
October 8, 2010

Chemistry
What volume of 0.105 M HNO3, in milliliters, is required to react completely with 1.40 g of Ba(OH)2? 2 HNO3(aq) + Ba(OH)2(s) Ba(NO3)2(aq) + 2 H2O(l)
September 23, 2010

Chemistry
In an experiment 1.015 g of a metal carbonate, containing an unknown metal M, is heated to give the metal oxide and 0.361 g CO2. MCO3(s) + heat MO(s) + CO2(g) What is the identity of the metal M?
September 23, 2010

math
5 people times 4 tickets each=20 tickets 20 tickets/100 tickets total=1/5 chance or 20% chance
September 22, 2010

Algebra 2
The first one you would move x to the other side making it negative, or subtract x from both sides giving: y=-x+4 -1 is the m and 4 is the b For the second one, you do the same thing. Add 4x to each side canceling the 4x on the left, or move 4x to the other side making it ...
September 22, 2010

Chemistry
A mixture of CuSO4 and CuSO4·5 H2O has a mass of 1.235 g. After heating to drive off all the water, the mass is only 0.830 g. What is the mass percent of CuSO4·5 H2O in the mixture?
September 22, 2010

Physics
What is the period of the minute hand of a clock?
September 18, 2010

College Physics
A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk?
September 18, 2010

Chemistry
1. Engineers design air bags that deploy almost instantly upon impact. To do this, an air bag must provide a large amount of gas in a very short time. Many manufacturers use sodium azide, NaN3, to produce the gas in such a manner 2NaN3(s)  2Na(s) + 3N2(g) What volume ...
September 2, 2010

Chemistry
For each of the following, write a net ionic equation (modeled above). Wherever there is a precipitate, state the name of the precipitate (e.g “lead iodide” from above). Pop onto the net and see if you can find a description of the physical properties (e.g colour) ...
September 2, 2010

Physics/ optics
An object is located 25cm in front of a +6.00 lens, where is the image? is it real or virtual?
April 2, 2010

optics
An objuect is located 20cm in front of a -3.00 lens where is the image?
April 2, 2010

Pre-Calculus
After leaving an airport, a plane flies for 1.75h at a speed of 200km/h on a course of 100 degrees. The plane then flies for 2 hours at a speed of 250km/h on a course of 40 degrees. At this time, how far from the airport is the planee?
March 30, 2010

maths
thanks
January 1, 2010

maths
if (x + 3)(x -2) = 1 show that x^2 + x -7 = 0
January 1, 2010

math
Convert 3214five to base ten
September 10, 2009

math
Dorthy is 6 years older than Ricardo. The product of their present age is twice what the product of their ages was 6 years ago. How old is Dorthy?
September 10, 2009

What does the word "predominant" mean? Oh and please don't give me a website with some big def. I am in 6th grade so I won't understand if the def. is big and long. It also helps if you use it in a sentence . . . just saying. :-D Thanks so much!
April 13, 2009

French
Thanks Senora for your help with the baby animals. I have a few more, which I tried googling/translating, but I found nothing. giraffe jars Thanks for your help
December 23, 2008

French
Does anyone know a list of baby animals in French, or know specifically what these are? ~baby bunny ~baby "Sanglier" ~baby "vache" ~baby turkey ~baby "Cane" ~baby cerf ~baby "jars" ~baby "jument" Merci for your help
December 22, 2008

How do you turn a fraction into a decimal?
October 6, 2008

geometry!! urgent (math)
The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cc, whta is the volume of this pyramid? To the nearest square cm, what is the combined area of the base and six lateral faces?
September 4, 2008

algebra