A boat can travel at a speed of 8km/h in still water on a lake.In flowing water of a stream, it can move at 8km/h relative to the water in the stream.If the stream speed is 3km/h, how fast can the boat travel upstream and downstream?
October 8, 2008
A population of 500 E. coli bacteria doubles every 15 minutes. Use this information to find an expression for this population growth. Using this expression, find what the population would be in 87 minutes. Use an exponential model. so we're supposed to use P(t)= (Po)(e)^kt...
July 14, 2008
A science project studying catapults sent a projectile into the air with an initial velocity of 30 m/s. The formula for distance (s) in meters with respect to time in seconds is s = -4.9t2 + 30t. Find the instantaneous rate of change (and thus the velocity at any time) using ...
July 10, 2008
For the function (x) = x2 find the slope of secants from the point (2, 4) to each of the following points. (3, __ ) (2.5 , __ ) (2.1 , __ ) (2.01, __ ) (2.001, __ ) Using the pattern from question 1, what do you think the slope of a tangent at the point (2, 4) would be? ...
July 10, 2008
How do you analyze a poem???...i always have trouble trying to understand the poem...especially metaphors because they have a different meaning then what the words means directly.
April 14, 2008
Hi, I had an SAT question of the day that I cannot figure out. The question is: If it is now 4:00 p.m. Saturday, in 253 hours from now, what time and day will it be? (Assume no daylight saving time changes in the period.) The answer choices are: 1. 5:00 a.m. Saturday 2. 1:00 ...
March 25, 2008
I am having trouble solving this problem. In 1994, the population of the Las Vegas metropolitan area was about 1,076,000 with an average annual growth rate of 6.5%. Assume this growth rate continues into the future. I have to estimate the population of Las Vegas each year. I ...
February 27, 2008
you can find the slope of the two lines...when it is perpendicular m1*m2=-1 m1=one of the slope m2=the second slope if you multiply the slopes together, you will get -1 if it is perpendicular.
February 27, 2008
you can use a substraction-or-addition method or substitude method. So... x+y=21 you multiply both side by 3 3x+3y=63 3x+4y=21 --------- then you eliminate one variable you use the subtraction method -y=42 y=-42 then you solve for x by substituting the y x+(-42)=21 x=63
February 26, 2008
What are some things that is like your heart beat...like a clock but the ticking of clock is too slow...like when you are scared, your heart beats very fast...what can be related to that? Are there any idioms that decribe your heart beats?
February 12, 2008
1. How did the book Tom Sawyer relevant to Mark Twain's real life? 2. How did the boys feel when they were in jackson's island 3. Why did the author put the position of the chapters that way? 4. Descibe all-american boy 5. Descibe the life of boyhood in Tom Sawyer
February 10, 2008
mass of empty flask with stopper = 32.634 g mass of flask with water and stopper = 59.479 g density of the water = 0.9973 g/cm^3 mass of water = 26.845 g volume of water = 26.918 cm^3 the flask is then emptied and an unknown substance is added mass of flask with new liquid and...
October 16, 2007
A ball is shot vertically upward from the surface of another planet. A plot of y versus t for the ball is shown in the figure below, where y is the height of the ball above its starting point and t = 0 at the instance the ball is shot. The figures vertical scale is set ...
October 2, 2007
During the semi-finals of the U. S. Open 2007 Grand Slam Tennis, Venus Williams was in the second set of her match against Justine Henin when her serve was clocked (by a radar gun) at 77 miles per hour. The ball left her racquet horizontally at a height of 2.37 m above the ...
October 2, 2007
Math Word Problem
I asked my teacher, and my teacher said it had 3 shelves.. A bookcase is to be constructed. The height of the bookcase is 4 feet longer than the lenght of a shelf. If 20 feet of lumber is available for the entire unit (including the shelves, but NOT the back of the bookcase), ...
August 21, 2007
Math Word Problems
Hi, I am having some trouble with some problems, can you please help. thanxs!!! 1. A car rental agency charges $250 per week plus $0.25 per mile to rent a car. How many miles can you travel in one week for $300? -Would the equation look like: 300= 250x + .25 ? 6. A train ...
August 18, 2007
A jewel thief decides to hide a stolen diamond by placing it at the bottom of a crystal-clear fountain. He places a circular piece of wood on the surface of the water and anchors it directly above the diamond at the bottom of the fountain, as shown below. If the fountain is x...
May 16, 2007
explain why a substancew with a network structure has a high melting point ? High is a relative term. What is high? coudnt u give me a better response Think what holds a network together? Bonds? Bonds must be broken to melt a solid. thank u
March 4, 2007
describe the difference between a ball-and-stck model and a space-filling model of a compound ? Vanessa--Have you seen a ball-and-stick model and a space-filling model? If so you will know how to answer this. dont give me stupid answers i can on for help not bs
March 4, 2007
I'm doing this one project for world history on the BATTLE OF BOUGAINVILLE, and I'm having trouble finding the right information, i can't find the leading military officers from both sides, the axis leader and the alied leader. can somebody help me? http://en....
February 27, 2007
I need to take some following samples of these: *a hydrocarbon w/a molecular mass greater than 100 g/mo *something w/ L-carvone or D-carvone in it *a non-electrolyte that dissloves in water *something w/a pressure greater than 2.o atom *a proton donor can you help me?? Go down...
February 4, 2007
Plz help me..just one MATH question
The number 1 is both the square of an integer and the cube of an integer. What is the next larger interger which is both a square and a cube of a positve integer. plz help, the only number i can think of was 0 but its smaller than one. what is the erroron the verdfind it and ...
November 7, 2006
MY DAUGHTER IS IN 3RD GRADE, AND I NEEDED HELP ON A QUESTION, STEVE'S BIRTHDAY IS BETWEEN MAY 23. THE DATE OF HIS BIRTHDAY IS NOT AN ODD NUMBER. THE SUM OF THE DIGITS IS 9. WHEN IS STEVE'S BIRTHDAY?? PLEASE HELP ME WITH THE ANSWER I DO NOT UNDERSTAND. 28b=-131.6 I ...
September 6, 2006