Preston
Most popular questions and responses by Preston
Physics
A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 19kg child in the car. Assume that the child's velocity is changed by the same amount as that of the car, and in the same time period. (a) What is the impulse needed to stop the
asked on November 21, 2010 
Physics
An airplane flies due north at 250 km/h relative to the air. There is a wind blowing at 60 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?
asked on October 6, 2010 
Algebra Homework, HELP!
1) A rectangle has an area of 297 square inches and a width which is three inches less than four times the length. Find the length and the width of the rectangle. 2) Let x represent the length of the shorter leg in a right triangle. If the longer leg is 1
asked on October 14, 2013 
Help with Physics PLEASE
A baseball is hit at 29.0 m/s at an angle of 50.0° with the horizontal. Immediately an outfielder runs 4.90 m/s toward the infield and catches the ball at the same height it was hit. What was the original distance between the batter and the outfielder?
asked on October 12, 2011 
algebra
You pull out the plug from the bathtub. After 40 seconds, there are 13 gallons of water left in the tub. One minute after you pull the plug, there are 10 gallons left. Assume that the number of gallons varies linearly with the time since the plug was
asked on August 18, 2013 
geometry
1. Perform these transformations on ∆TRL and compute the perimeter of the preimage and final image. Show your computation for finding the image vertices and for finding the perimeters. a. Rotate ∆TRL 180¢X about the origin and label the resulting
asked on January 25, 2011 
Physics
A baseball is hit at 29.0 m/s at an angle of 50.0° with the horizontal. Immediately an outfielder runs 4.90 m/s toward the infield and catches the ball at the same height it was hit. What was the original distance between the batter and the outfielder?
asked on October 12, 2011 
math (rate)
A blue candle is twice as long as a red candle. The blue candle takes 6 hours to burn out, and the red candle takes 15. After 5 hours, what fractional part of each candle is left? The blue candle's length is what fraction of the red candle's length?
asked on January 17, 2007 
math
A bag contains red, blue, and orange marbles. If the probability of randomly selecting a red marble is 0.4 and the probability of selecting a red or blue marble is 0.9 what is the probability of selecting a red or orange marble? In my opinion, the easiest
asked on January 25, 2007 
Chemistry
Using John Dalton's law of multiple proportions. There are two different compounds of sulfur and fluorine. In SF6, the mass of fluorine per gram of sulfur is 3.55 gF/gS. IN the compound, SFx, the mass of fluorine per gram of sulfur is 1.18 g F/g S. What is
asked on August 28, 2011 
Physics
The space shuttle is in a 150kmhigh circular orbit. It needs to reach a 560kmhigh circular orbit to catch the Hubble Space Telescope for repairs. The shuttle's mass is 7.00×10^4kg. How much energy is required to boost it to the new orbit? In the
asked on May 11, 2011 
Calc.
A ladder 25ft long is leaning against the wall of a house. The ladder is pulled away from the wall at a rate of 2 ft per second. How fast is the top of the ladder moving down the wall when its base is 7ft from the wall?
asked on November 1, 2010 
Calculus
Many scientists believe that there have been four Ice Ages in the past 1 million years. Before the technique of carbon dating was known, geologists erroneously believed that the retreat of the Fourth Ice Age began about 25,000 years ago. In 1950, logs from
asked on September 14, 2010 
math 2
A video arcade offers 6 free games to first time costomers. Each game costs $.75 and after every four games, you get a free game. How many games could you play for $3.00 the first time you are a costomer? 6 free to begin 4 games=$3.00 +1 free 11 games
asked on January 23, 2007 
Physics
Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 85.0 m and the coefficient of friction is 0.38?
asked on October 6, 2010 
Math
On a certain farm, on average, 64 hens lay 768 eggs in 64 days. On that same farm, on average, 46 hens eat 46 kilograms of wheat in 46 days. On this farm, on average, the consumption of how much wheat (in kg) corresponds to 2 dozen eggs?
asked on September 26, 2008 
math
How many 22 cenimeter oieces of string can be cut from a 4.2 meter piece of string? How many centimeters are left over? Convert 4.2meters into centimeters, then try dividing 22 centimeters into that number how here's a conversion chart that should help
asked on January 25, 2007 
math
Apples sell for $1.29 a pound, and there is an average of 3 apples per pound. About how many apples would you expect to get for $5.00? First, you need to divide $1.29 by 3. Did you get $.43? That's the amount that one apple costs. Now  divide $5.00 by
asked on January 23, 2007 
math
Stamps come in large sheets with perforations in between. How many different ways can you buy 4 attached square stamps? ( Two ways to put them together are considered the same if one way can be turned or flipped so that its outline looks like the other
asked on January 23, 2007 
entrepreneurship
What does it mean to have liability for a company? A. It means your company is late in paying its taxes. B. It means you have a conflict of interest because you are in a position where you can take unfair advantage of your customers. C. It means your
asked on January 16, 2019 
math
Sandy dropped a basketball from the top of her Mom'soffice building which is 72 meters tall. She discovered that the first bounce bounced 36m on the second bouce the ball bounced 18 meters. if this pattern continues, how high will the ball bounce on the
asked on January 24, 2007 
Algebra II
The discriminant of an equation is 73. How many times will the graph of this equation touch the x–axis?
asked on November 19, 2010 
Math
Samantha rides her bicycle 5 miles in 2 fifths of a hour at this rate how many miles could she ride in 2 hours
asked on April 14, 2016 
Georgia Studies/Social studies
I had a 57 question home work assignment and i need help with these last 4: 1. Which of Georgias cities was the least important in the early 1800s a.atlanta b.athens c. Madison d. Monroe 2.Qith which chirch was Bishop Richard Allen associated with in early
asked on January 23, 2008 
Literature/history
Did Edgar Allen Poe have any Children?
asked on January 10, 2008 
math 3
A number x is increased by 27 and the result is multiplied by 6, giving 372 as te result. what was the original naumber_________ (x+27)6=372 6x +162==372 6x=210 x=35
asked on January 23, 2007 
Physics
An airplane flies due north at 145 km/h with respect to the air. There is a wind blowing at 65 km/h to the east relative to the ground. What is the plane's speed relative to the ground?
asked on October 6, 2010 
Physics
You are driving a 2520.0kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides
asked on October 5, 2010 
Calculus
Determine the equations of the following lines: (a) having slope ¡1 and passing through (0; 2) (b) parallel to y=2x1 and passing through (¡2; 0) (c) passing through (1; 0) and (¡1; 3) (d) with xintercept 6 and yintercept 3.
asked on September 14, 2010 
math
If two sides of a square field were incresed by three feet the area of the field would increase by 129 square feet. find the area of the original field. If two sides of a square field were incresed by three feet the area of the field would increase by 129
asked on January 24, 2007 
CSI 115 Logic And Design
Hi I know you have got this same question ask to you a lot, but mine is for week 2 unstead of week 1. This week they want me to come up with and Create the Modular Design for the same subject as week 1, example underneath please. A small startup software
asked on January 13, 2011 
Physics
A boat is rowed directly upriver at a speed of 2.4 m/s relative to the water. Viewers on the shore see that the boat is moving at only 0.6 m/s relative to the shore (heading upriver). What is the speed of the river?
asked on October 6, 2010 
calculus
Find the average rate of change of the function f(x) = 2x4 + 3x2 ¡ x + 2: (a) on the interval [0; 3] and (b) on the interval [¡2; 0]
asked on September 14, 2010 
Pigskin
Which two competing teams would deserve this tittle of the kudzu klash
asked on November 20, 2008 
social studies
Okay i had the long cross word to do and now im down to like the last couple i need help 1.              also known as the "swamp fox" he used Guerilla, hit and run tactics against the brittish in the southern colonies. 2.    the Virginian
asked on November 26, 2007 
math
what is 10% of 20% of 30% pf 100? 100 * .30 = 30 30 * .20 = 6 6 * .10 = .6 I hope that's what your looking for! Are these three separate questions? 10% = 0.10 x 100 = ?? 20% = 0.20 x 100 = ?? 30% = 0.30 x 100 = ?? Remember of means times. Or is it just one
asked on January 29, 2007 
math2
Mary is moving and wants photos to remember her six friends. If pictures are taken so there is a shot of every possible pair of friends including Mary, how many pictures will be take? Would one roll of 24 exposures be enough? 27 Mary is moving and wants
asked on January 24, 2007 
algebra I
Would like the best way to explain two variable equations to 9th grader.
asked on August 21, 2013 
Physics
A particle undergoes three displacements. The first has a magnitude of 15 m and makes an angle of 30 degrees with the positive x axis. The second has a magnitude of 8.6 m and makes an angle of 149 degrees with the positive x axis. After the third
asked on February 5, 2013 
Calculus
Find the local extrema of the function f(x) = (e^x^2+1)/(2x+1) defined for x > 0, and specify whether they are minima or maxima and give reasons why they are what you claim they are.
asked on October 18, 2010 
Calculus
Find the slope of the tangent line to the curve y = (x^2 8)^6 at x = 3, and write the equation of the tangent line.
asked on October 18, 2010 
Physics
A powerboat heads due northwest at 11 m/s relative to the water across a river that flows due north at 5.9 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore?
asked on October 6, 2010 
Calculus
Find the exponential curve through (7, 10) and (9, 250). Recall that an exponential curve is one given by the equation y = A * bx (i.e. is the set of all points (x,A * bx).
asked on September 14, 2010 
Calculus
Find the exponential curve through (7; 10) and (9; 250). Recall that an exponential curve is one given by the equation y = A ¢ bx (i.e. is the set of all points (x;A ¢ bx).
asked on September 14, 2010 
math
rob & freddie have 15 cds between them. rob has twice as many as freddie. how many cds does rob have
asked on February 19, 2010 
math
how to put this in vertex form: 2(2x1)(x+4)
asked on January 31, 2010 
math
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many
asked on October 2, 2008 
math
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many
asked on October 2, 2008 
georgia studies
what word fits these: .one whose occupation is survaying land .association of persons for a common benifit . a public offficer of a town or township responsible for keeping peace .to wander in search of food . sonmething that serves as a protective barrier
asked on October 1, 2007 
science
what is a fungi that doesnt fit into the other standard groups of fungi? Since this is not my area of expertise, I searched Google under the key words "fungi grouping exception" to get these possible sources: http://www.bioimages.org.uk/html/T74.HTM
asked on April 11, 2007 
math
Spaghetti cost 99 cent a poud. A jar of sauce cost $2.59 and bread is 2 loaves for $1.39. How much would 2 pounds of speghetti 2 jars of sauce and 3 loave of bread cost to the nearest dollar? 1.39 for bread divided by 2 is about .70 for each loaf so....
asked on January 22, 2007 
math
insert perenthesis to make the sentence true: 406x626=10 406x(62)6=10 hey
asked on January 22, 2007 
Physics
An object is thrown vertically upward such that it has a speed of 32 m/s when it reaches two thirds of its maximum height above the launch point. Find the maximum height h. The accelera tion of gravity is 9.8 m/s2 . Answer in units of m
asked on February 3, 2013 
Microeconomics
Assume that the marginal utilities for the first three units of a good consumed are 200, 150, and 125 respectively. What is the total utility for the first unit?
asked on July 27, 2012 
math
how do I figure out how to write an equation (and solve the problem) for algorithm?
asked on September 21, 2011 
math
given that csc(theta) =3 and cos(theta)>0, find the remaining 5 trigonometric functions of theta. i have my triangle graphed in the fourth quadrant but I'm getting confused because of the negatives...
asked on August 28, 2011 
Physics
A descent vehicle landing on Mars has a vertical velocity toward the surface of Mars of 6.0 m/s. At the same time, it has a horizontal velocity of 3.5 m/s. At what speed does the vehicle move along it's decent path? At what angle with the vertical is this
asked on October 1, 2010 
Math
if i am planning a trip based on last years weather the weather is as follows: 68;68;63;75;75;63;46;67;75;75;75;68;71;65;61;68;70;72;72;70;70;71;81;84;85;85;80;79;80;80 and those are 30 consecutive days of the month last year. what is the expected value.
asked on July 4, 2009 
math
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many
asked on October 2, 2008 
math algebra
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many
asked on October 1, 2008 
grammar
i am writing a 10 page essay on college and pro football. can anyone help?
asked on January 28, 2008 
social studies
how are some African people and nations working to improve their economic situation? Some African people are leaving. Northern Africans are illegally boating to Europe. Several countries have destroyed their economic infrastructure by stealing
asked on February 9, 2007 
math
A gymnast received the following scores from 5 judges in the state competition. floor:8.8, 9.3, 8.1, 8.9, 9.5 bars: 7.6, 8.2, 8.5, 8.2, 8.9 vault: 9.5, 8.9, 9.4, 9.5, 9.0 beam: 8.4, 8.5, 8.4, 7.9, 8.7 Her score for each event is found by computing the
asked on January 25, 2007 
Physics
What is the maximum amount of force a human can exert in newtons?
asked on October 2, 2011 
Calculus
Find f'(x) if f(x) = (√x*e^xx^2)/ (x^2+1)
asked on October 18, 2010 
Calculus
Find f'(x) if f(x) = (ln(x^2+x+1)+2x+3)\ (x^2+1) .
asked on October 18, 2010 
Calculus
Find the points on the graph of y = (x+1)/ (x+2) where the tangent line is parallel to the line x  y = 2.
asked on October 18, 2010 
Calculus
r(x) =( √x + 9+ √x)^5 Calculate the derivative of the function
asked on October 7, 2010 
calculus
Suppose that a colony of fruit °ies is growing according to the exponential law P(t) = P0ekt, and suppose that the size of the colony triples in 11 days. Determine the growth constant k. [You may leave your answer as a fraction, with logarithm(s) in it.]
asked on September 14, 2010 
Math
When solving exponential equations using logarithms. How would you sold one that has a fraction as the exponent such as: x^(1/4)81=0
asked on November 19, 2009 
Essay
I've written an essay and I'd like to know if there is any help you can give me on how to make it better or is it okay as is? It felt as if I were unconscious. I couldn’t think straight at that point in time; things were happening so fast, and I wasn’t
asked on January 9, 2009 
hard math
42 students took a test in school where the passing score was 70. the mean score of the 42 students taking the exam was 75.5 while the mean score of the students who passed the test was 81, and the mean score of the students who failed was 60. How many
asked on October 3, 2008 
Math
I need help determining the last value. A B C 3 1 8 7 5 24 19 9 280 41 21 1240 .75 .2 ? If you can figure out that last piece of date I'd appreciate and explanation too.
asked on October 3, 2008 
math
Observe the table of values. The values in Column C are determined by the values in Columns A and B. Determine the missing value in Column C. A B C 3 1 8 7 5 24 19 9 280 41 21 1240 0.75 0.2 ?
asked on October 2, 2008 
Math
If 10% of 10% of a certain number is 2, this certain number is... A.)20 B.)100 C.)120 D.)200
asked on September 6, 2007 
math
What will be the digit in the tens place of the sum of the following expression: 7 + 77 + 777 + 7777 + ... + 7777777777777777777 1. (The same as if you added 5x7 and 4x70) The numbere in the 100's and higher places don't contribute to the amount in the
asked on January 22, 2007 
math
Ricardo wants to cover a 8" by 10" by 5" box with contact paper How many square inches of caontact paper will he need? How much ribbon will he need if the bow itself adds 15"
asked on January 22, 2007 
math
Ricardo wants to cover a 8" by 10" by 5" box with contact paper How many square inches of caontact paper will he need? How much ribbon will he need if the bow itself adds 15" just do l*W*H 8*10*5 then for the ribbon just add 15 to the solution of 8*10*5 =
asked on January 22, 2007

Environmental Science
good person was right
posted on November 12, 2018 
educational technology
your idiot I got a 33.3 the answers are not a b d why you got to be retarted.
posted on September 28, 2018 
math
33
posted on March 18, 2018 
Math
Gerald can complete a math assignment in 2 hours and a physics assignment in 1 hour. If he has 8 hours to complete a set of assignments, how many math assignments can he complete if he decides to leave the science assignments for the next day? This
posted on October 24, 2016 
5th grade
salt and coride. WASSUP
posted on October 22, 2015 
abnormal psychology
true
posted on June 9, 2014 
Calculus
Yes that is how it is. sorry i am not good at typing them out
posted on September 14, 2010 
Calculus
yea it is having trouble. thanks again. i am just stuck on my other one now
posted on September 14, 2010 
calculus
Thank you so much. I think i got this one. Calculus is hard.
posted on September 14, 2010 
calculus
wow thanks a lot. i am glad you helped me out thanks again
posted on September 14, 2010 
Calculus
Thanks so much helps a lot.
posted on September 14, 2010 
Calculus
I just need help getting started with this one.
posted on September 14, 2010 
English
They could be sleeping in a gym because of natural disasters (weather, etc).hope this helps
posted on September 14, 2010 
calculus
Any help would be great. i am so confused
posted on September 14, 2010 
Calculus
I have no clue where to begin.
posted on September 14, 2010 
calculus
I need help. i am so lost
posted on September 14, 2010 
geometry
y=mx+b
posted on September 14, 2010 
Math
i know how to find the mean and the median but i need to know how to find the expected value of the set.
posted on July 4, 2009 
Essay
it didn't seem to show it all?
posted on January 9, 2009 
georgia studies
all of those helped me exept for I CAN HELP WITH WHAT I KNOW BUT PLEASE HELP FINISH .association of persons for a common benifit c_ _ _e_a_ _ _ _ .a public offficer of a town or township responsible for keeping peace c_n_ _ _b_e .sonmething that serves as
posted on October 1, 2007