Sunday
March 29, 2015

Posts by erika


Total # Posts: 356

algebra
morgan saw 10 blue cars 8 red cars and 42 white cars drive by her house in 1 hour what is the experimental probability that the next car will not be white
March 12, 2015

math
maria throws a ball straight up with an initial velocity of 10m/s what is its velocity at the highest point?
March 10, 2015

Math
Pick any single digit number. Multipy it by 12,345,679. Then multiply the result by 9. What happens? Explain why this works.
March 1, 2015

Math
John and Miles each had some money. First Miles gave John a quarter. Then John gave Miles one-third of his money. Then Miles gave John one-third of his money. At the end, John had $2.50 and Miles had $2.00. How much did they each start with?
February 26, 2015

Math
After dinner, three friends at a restaurant paid their bill and noticed a bowl of mints on the front counter. Sean took one-third of the mints but returned four because he had a momentary pang of guilt. Fred then took one-fourth of what was left but returned three for similar ...
February 22, 2015

Math
Three boxes each contain a number of billiard balls. One box contains only even-numbered balls, one box contains only odd numbered billiard balls, and the third box contains a mixture of odd and even numbered balls. All the boxes are mislabeled. By selecting one ball from only...
February 17, 2015

Math
A 6 story building has stairs between equally spaced doors. How many times higher is the climb from the first to the sixth floor than the climb from the first to the third floor?
February 16, 2015

math
Suppose in a town three-fourths of the men are married to one-half of the women. What is the ratio of men to women in this town?
February 12, 2015

Math
How did you get y=1.56x?
February 12, 2015

Math
Suppose in the early 1900s the levels of CO2 in the atmosphere was only 64% of the levels of CO2 today. What percentage more is the level of CO2 today compared to the levels of CO2 in the early 1900s?
February 12, 2015

Math
A mixture is 20% red paint, 35% yellow paint, and 45% water. If 5 quarts of red paint are added to 20 quarts of the mixture, what is the percentage of red paint in the new mixture?
February 10, 2015

Math
Well, I subtracted 1000-800= 200 miles, which was my remaining miles. She wants to finish at an average of 1000 mph so that she would have flown at an average of 1000mph, so speed is 1000mph. I plugged in this values in the formula: average speed=distance/time... 1000=200/time...
February 10, 2015

Math
A jet pilot is making a 1000 mile trip in her military Tomcat. She flies 800 mph for one hour and decides she wants to finish the trip so that she would have flown at an average of 1000 mph. How fast should she go to finish the trip and meet her goal?(Hint: Think carefully ...
February 10, 2015

Math
But, what shapes are those measurements?
February 10, 2015

Math
If a field has perimeter P, what shape maximizes the area? Justify your reasoning.
February 10, 2015

Math
Explain why the product of any two consecutive natural numbers is even. Prove your conjecture.
February 10, 2015

Math
Find all pairs of integers such that when they are added they equal 100, and when they are multiplied they are at least 2000.
February 10, 2015

Math
Pick what age you would like to be (may be your actual age if you like). Add 10. Multiply the result by 4. Add 200. Divide by 4. Subtract your original number. The final result is 60. Explain how I knew that.
February 10, 2015

Math
What is 100^2-99^2+98^2-97^2+96^2-95^2 +...+ 4^2-3^2+2^2-1^2 ? (Find an expression where n is the largest number being squared, then use it to calculate the sum when n = 100. Hint: Examine specific cases where n is small. Then generalize).
February 9, 2015

Math
In a group of 9 coins, one is fake and weighs slightly less. What is the fewest number of times you need to use a pan balance to find the counterfeit coins? (A pan balance is a scale used to measure weights, where weights are placed in two pans. The heaviest pan will go down ...
February 3, 2015

Math
Find the remainder when 3^997 is divided by 5. n=1 3n/5=3/5 n=2 3^2=9/25 n=3 3^3=27/5 n=4 3^4=81/5 n=5 3^5=243/5 r=3,4,2,1,3,4,2,1 n=997
February 3, 2015

Math
Randy had a sheep that started eating more and more as each day passed. on the first day, Tandy's sheep ate 5 carrots. On the second day, Randy's sheep ate 11 carrots. On the third day, the sheep ate 18 carrots. And on the fourth day, the gluttonous sheep ate 26 ...
February 3, 2015

statics
A1 Helicopter in flight with unbalanced stores A helicopter in forward flight is shown in Figure 1. The helicopter in forward flight experiences a horizontal drag force DF  . The drag force DF  is assumed to pass through O. The helicopter is held up in the air ...
February 2, 2015

Physics
You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
November 1, 2014

Physics
Your new designer chair has an S-shaped tubular metal frame that behaves just like a spring with the spring constant 13500 N/m. When your friend, who weighs 910 N, sits on the chair, how far does it bend?
September 26, 2014

math
never mind, i figured it out! :) g= 50
September 7, 2014

math
Given that: 4(2g + 104) - 96 = 504 + 6(g - 14), solve for g. i'm confused on how to set this problem up - if anyone could help that would be great. thank you.
September 7, 2014

Biology 30
In what size populations might you expect it to be relatively common for alleles to become fixed? Why? I think that larger populations would be more likely to have fixed alleles, since perfect Hardy-Weinberg equilibrium states that there will be no change in allele frequency ...
May 23, 2014

HELP!
Next year (sophomore year) I'm taking the following courses: Honors Algebra II/Trig Spanish III Health AP Biology Honors English AP World History Is AP Bio and world history hard? or no it's not just the exam. Please tell me because this is my first year taking AP.
April 14, 2014

statistics
a. with replacement? b. without replacement?
April 7, 2014

statistics
if 2 out of 100 second graders are randomly selected, find the probability that they are both boys and like spring. boys/spring 39
April 7, 2014

math
a storage room measures 11.35 feet in length by 9.5 feet in width by 8.3 feet in height. it contains a box which is 4.25 feet in length 6.5 feet in width and 4.0 feet in height.how many cubic feet of storage space are left in the room rounded to the nearest cubic foot
April 7, 2014

Chemistry
How would you start and finish these questions by a step by step process? Does Amp equal to Joules? 1. How many grams of aluminum can be produced by the electrolysis of aqueous aluminum chloride by a current of 5.00 amps for 5.00 hours? 2. Consider the following ...
April 6, 2014

math
Jorge sees that there are small and large squares in the tile design belo.how many squares are there in all in the design?
March 20, 2014

science
- Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
February 27, 2014

Ed. Tech.(Need answers checked)
number 3 is B
February 4, 2014

Geology
Pleistocene mammoth bone from La Brea Tar Pits of Los Angeles, California. Age: 12,200 ± 35 years
December 10, 2013

Biology 20
I'm using chromatography to identify compounds in a leaf extract for a lab, and one of the evaluation questions is 'Suggest a step that could be added to the procedure to isolate a specific compound for chemical testing.' What step could I use?
October 30, 2013

college chem
a compound containing
October 7, 2013

math
1;2; 3; 4
September 23, 2013

math
Jon makes a bar graph that shows the number of dogs owned by members of his class. if the smallest number is 1 and the largest number is 4; what interval should Jon use?
September 23, 2013

science
a child is pushing a shopping cart at a speed of 1.5 m/s. how long will it take this child to push the cart down the aisle with a lenght of 9.3m?
September 8, 2013

French
But now the problem is that another word doesn't fit in...g_ _ _ e In the sentence Avant de partir en voyage, on consulte toujours un g_ _ _ e touristique?
September 4, 2013

French
Thank you so much! I completely overlooked that vocabulary word in my textbook!
September 4, 2013

French
I'm doing a French crossword puzzle, and I'm stuck on one of the words. It's a four letter word like: _a_d And it fits in the sentence: Le train part de la____ de Lyon. Could someone help me out? Thanks!
September 4, 2013

French
How do you translate: "May I ask some questions?" into French with correct grammar?
June 8, 2013

French
Oh, it makes sense now! Thank you very much!
May 25, 2013

French
Oh, I translated wrong, my apologies. So then, how would I answer this? I'm unsure of what it is asking.
May 25, 2013

French
What is the translation of "Comment s'appelle ce terrain de camping"? I know that the literal translation is, "How do you call camping"? but that makes no sense to me.
May 25, 2013

French
Thank you, Ms. Sue :)
May 25, 2013

French
What is the English translation of: Que veut dire VTT?
May 25, 2013

Indefinite Integrals
find the indefinite integral of (1/x)*(e^(-2log[ 3,x])) dx where 3 is base of the log i cannot even figure out where to start :( please help. thank you
May 24, 2013

Derivatives
Find f'(x): (abs(((x^2)*((3x+2) ^(1/3)))/((2x-3)^3)) So I thought I should split it into two parts: A and B. A) (x^2)/((2x-3)^2) B) ((3x+2)^(1/3))/(2x-3) My plan was to differentiate each part and then multiply them together, since multiplying their denominators together ...
May 24, 2013

Integrals- Log/Ln
I'm still getting it wrong, so I'm not sure what's with that.. Thank you for your help though!
May 24, 2013

Integrals- Log/Ln
Can you check this please i'm not sure why it's wrong .__. 1) indefinite integral of 1/t *ln(t) dt the t*ln(t) is altogether on the bottom i got ln(ln(x)) + C 2) find the indefinite integral of 1/(sqrt(t)*[1-2*sqrt(t)]dt sqrt(x) is on the bottom. i got -ln(1-2*sqrt(t...
May 24, 2013

French
Hello! Could someone please read this report on my trip to Paris, and correct it? Thank you! Mon voyage en France était très amusant! Nous allé à Paris. Nous regardé l’églises, monté Le Tour Eiffel, et prendre plus des ...
May 20, 2013

French
Ahh, thank you so much! it makes sense now! MErci!
May 20, 2013

French
Just a quick question... how do you do futur proche in French?
May 20, 2013

Math
It takes pipe A 14 days to fill the fish pond. It takes pipe B 18 days to fill the same pond. Find out how pond it takes both pipes working together to fill the pond
May 20, 2013

physics
A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?
April 24, 2013

Physics
The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 26°C. -Find wavelengths fron 20 hz: -Find wavelengths for 20,000 hz:
April 24, 2013

physics
A sound wave has a frequency of 686 Hz in air and a wavelength of 0.50 m. What is the temperature of the air? -Find wavelengths for 20 hz: -Find wavelengths for 20,000hz:
April 24, 2013

Physics
A sound wave has a frequency of 686 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?
April 24, 2013

math
Two different relationships are shown below. Relationship 1: xy = 3 Relationship 2: A graph is shown that has the following points plotted: one comma three, two comma six, three comma nine, four comma twelve. a) Identify each relationship as direct or inverse variation. b) ...
April 16, 2013

physics
A particle with a +5.0 µC charge and a kinetic energy of 0.090 J is fired into a uniform magnetic field of magnitude 0.30 T. If the particle moves in a circular path of radius 3.0 m, determine its mass.
March 26, 2013

chemistry
how do you convert .99grams of copper to moles using the atomiuc weight
March 11, 2013

geometry
The angle of depression from the top of a lighthouse to a boat in the water is 30°. If the lighthouse is 89 feet tall how far is the boat from the lighthouse to the nearest foot? Answers available in ... 10Take this time to do your best on this question. A) 45 feet ...
February 12, 2013

Religious Studies
When did the First Crusade start & end? Like as in the exact date? I can't seem to find it in any of my information books or online!
January 20, 2013

science
what is the gravitational potential energy of an object to its weight multiplied by its what?
January 16, 2013

chemistry
HO-HO-BENZENE RING-CH=CH-NH2 WHAT IS THE NAME OF THIS COMPOUND
January 15, 2013

chemistry
figure 1 HO- ######## # # # # # # # # # # HO-# # # #-CH=CH-NH2 # # # ###### # # # ######## BENZENE RING what is the name of this compound or figure 1
January 15, 2013

chemistry@@@
Explain what the terms chiral atom and chiral molecule mean. write in three sentences.thanks
January 14, 2013

calculus
Thank you! helped a lot and yes I meant '=' , basically I think he just wants us to explain on why it did or didn't fail, yes I know very strange! :)
January 3, 2013

calculus
The ellipse x^2+3y^3=13, has two points when x+-1 . Find the slope of the ellipse at both these points. 2. Thoroughly explain the method you used to find the slope in part 1. What are the strengths and weaknesses of the method you used? 3. Explain whether your method will work...
January 3, 2013

History
Should environmental policy focus on developing more oil resources or on developing renewable energy sources? Or, is there another, better way to frame the discussion?
January 1, 2013

English
How do these examples even compare to the question I asked?
December 28, 2012

English
Should environmental policy focus on developing more oil resources or on developing renewable energy sources? Or, is there another, better way to frame the discussion?
December 28, 2012

Physics
A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.
November 18, 2012

physics
The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? (in oC).
November 16, 2012

HELP! Physics
A heat engine operates between two reservoirs at temperatures of 19.7oC and 294oC. What is the maximum efficiency possible for this engine?
November 16, 2012

Physics
Initially 1.200 mol of an ideal gas in a container occupies a volume of 3.50 l at a pressure of 3.30 atm with an internal energy U1 = 547.2 J. The gas is cooled at a constant volume until its pressure is 1.80 atm. Then it is allowed to expand at constant pressure until its ...
November 16, 2012

Physics
A 50.0 Kg ball rolling at 10.0 m/s eastward (on a frictionless surface) collides with a 20.0 Kg ball rolling westward at 20.0 m/s. After the collision the two balls stick together (coalesce). What is the momentum after the collision?
November 14, 2012

Physics
An arrow is shot at an angle such that it's horizontal velocity is 40 m/s and it's vertical velocity is 20 m/s. Find the horizontal distance the arrow will travel before hitting the ground
November 14, 2012

Physics
An arrow is shot at an angle such that it's horizontal velocity is 40 m/s and it's vertical velocity is 20 m/s. Find the horizontal distance the arrow will travel before hitting the ground.
November 14, 2012

Physics
An object with a mass of 50 kg is being dragged along a horizontal floor by a horizontal force of 30 N. If the friction force opposing the motion is a steady 20 N, what is the acceleration of the body
November 9, 2012

CHEMISTRY
2C2H2+ 5O2-> 4CO2+ 2H20. If 1 mole of C2H2 reacts with oxygen, how many moles of C02 are produced.
September 28, 2012

Chemistry
how many moles of Cl in 2.7 mol CaCl2
September 25, 2012

physics
A heat engine has a hot reservoir of 680°C and a cold reservoir of 220°C. What is the efficiency of the engine?
September 20, 2012

computer science python
write a program that displays all the cards in a deck using one tuple for suit and one for rank.
September 17, 2012

math
what is 10000 less than 337676
September 5, 2012

science
Find the horizontal and vertical components of the velocity of a cannonball 4 seconds after being fired horizontally at 400 m/s from the edge of a tall cliff.
September 4, 2012

chemistry
3h2+n2 makes 2NH3's if I have 4 moles of H2 instead and 2 moles of N2 would I still just say I have 2.0 or 2.7?
July 1, 2012

chemistery
so grams = 4 * 39.98 ? = 159.92
July 1, 2012

chemistery
how many grams of NaOH are needed to react with two moles of H2SO4
July 1, 2012

Math
A student answered the following skill-testing question to try and win a prize: (-4)^3-(-2)^4/2^2+5^2*7^0 The students answer was 5. Did the student win the prize? I couldn’t seem to figure out how to answer this question. I got the answer -13, but my answer sheet said -...
June 25, 2012

Science
The placement of metal and non-metal elements in the periodic table makes it possible to predict the formation of compounds. Which of the following chemical formulas indicates the formation of an ionic compound? a. KI b. ICI c. SO3 (the three is small) d. CHCL3 (the three is ...
June 20, 2012

Grade 9 Chemistry (2)
What is one way in which Noble Gases are different from other elements? a. Noble Gases have low boiling points b. Noble gases have high melting points c. Noble gases have extremely high densities d. Noble gases have unusually high atomic masses Also, what is a 'valence ...
June 20, 2012

Religion
Well, the Passover was instituted by God. God instituted the Passover to remind the people of how He freed them from the Egyptians. The Exodus was actually the leaving of Egypt. The 10 commandments was God's word to the people, telling them how to live according to Him. He...
June 20, 2012

Science
When people buy astronomical telescopes, they have an option to buy a set of eyepieces to go with it. If Fred bought a telescope with an objective with a focal length of 2000 mm, and eyepieces with focal lengths of 40 mm, 16 mm, and 8 mm, then what magnifications will Fred ...
June 20, 2012

integrated chemistry and physics
If 2 blocks have the same mass which one has the greater acceleration?
May 16, 2012

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