# Posts by Preston

Total # Posts: 94

**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

*April 14, 2016*

**abnormal psychology**

true

*November 3, 2013*

**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 more than the ...

*October 14, 2013*

**algebra I**

Would like the best way to explain two variable equations to 9th grader.

*August 21, 2013*

**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 pulled. Write the ...

*August 18, 2013*

**Mathematicts**

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 situation is given by 2x + ...

*May 27, 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 displacement the particle...

*February 5, 2013*

**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

*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?

*July 27, 2012*

**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?

*October 12, 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?

*October 12, 2011*

**Physics**

What is the maximum amount of force a human can exert in newtons?

*October 2, 2011*

**math**

how do I figure out how to write an equation (and solve the problem) for algorithm?

*September 21, 2011*

**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 the value of X ...

*August 28, 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...

*August 28, 2011*

**Physics**

The space shuttle is in a 150km-high circular orbit. It needs to reach a 560km-high 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 original orbit, I ...

*May 11, 2011*

**geometry**

1. Perform these transformations on ∆TRL and compute the perimeter of the pre-image 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 image ∆...

*January 25, 2011*

**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 developer company ...

*January 13, 2011*

**Physics**

A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 19-kg 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 child in N*s?(b...

*November 21, 2010*

**Algebra II**

The discriminant of an equation is 73. How many times will the graph of this equation touch the x–axis?

*November 19, 2010*

**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?

*November 1, 2010*

**Calculus**

Find f'(x) if f(x) = (√x*e^x-x^2)/ (x^2+1)

*October 18, 2010*

**Calculus**

Find f'(x) if f(x) = (ln(x^2+x+1)+2x+3)\ (x^2+1) .

*October 18, 2010*

**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.

*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.

*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.

*October 18, 2010*

**Calculus**

r(x) =( √x + 9+ √x)^5 Calculate the derivative of the function

*October 7, 2010*

**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?

*October 6, 2010*

**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?

*October 6, 2010*

**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?

*October 6, 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?

*October 6, 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?

*October 6, 2010*

**Physics**

You are driving a 2520.0-kg 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 to a halt in a ...

*October 5, 2010*

**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 path?

*October 1, 2010*

**deez nutz**

salt and coride. WASSUP

*September 27, 2010*

**Calculus**

Yes that is how it is. sorry i am not good at typing them out

*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).

*September 14, 2010*

**English**

They could be sleeping in a gym because of natural disasters (weather, etc).hope this helps

*September 14, 2010*

**geometry**

y=mx+b

*September 14, 2010*

**calculus**

wow thanks a lot. i am glad you helped me out thanks again

*September 14, 2010*

**calculus**

I need help. i am so lost

*September 14, 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.]

*September 14, 2010*

**Calculus**

I just need help getting started with this one.

*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).

*September 14, 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 ancient spruce trees...

*September 14, 2010*

**Calculus**

yea it is having trouble. thanks again. i am just stuck on my other one now

*September 14, 2010*

**Calculus**

Thanks so much helps a lot.

*September 14, 2010*

**Calculus**

I have no clue where to begin.

*September 14, 2010*

**Calculus**

Determine the equations of the following lines: (a) having slope ¡1 and passing through (0; 2) (b) parallel to y=2x-1 and passing through (¡2; 0) (c) passing through (1; 0) and (¡1; 3) (d) with x-intercept 6 and y-intercept 3.

*September 14, 2010*

**calculus**

Thank you so much. I think i got this one. Calculus is hard.

*September 14, 2010*

**calculus**

Any help would be great. i am so confused

*September 14, 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]

*September 14, 2010*

**math**

rob & freddie have 15 cds between them. rob has twice as many as freddie. how many cds does rob have

*February 19, 2010*

**math**

how to put this in vertex form: -2(2x-1)(x+4)

*January 31, 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

*November 19, 2009*

**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.

*July 4, 2009*

**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. or expected temp?

*July 4, 2009*

**Essay**

it didn't seem to show it all?

*January 9, 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 able ...

*January 9, 2009*

**Pigskin**

Which two competing teams would deserve this tittle of the kudzu klash

*November 20, 2008*

**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 students passed the test?

*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.

*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 ?

*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 students passed the test?

*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 students passed the test?

*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 students passed the test?

*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 students passed the test?

*October 1, 2008*

**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?

*September 26, 2008*

**grammar**

i am writing a 10 page essay on college and pro football. can anyone help?

*January 28, 2008*

**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 1800s? a.Church of ...

*January 23, 2008*

**Literature/history**

Did Edgar Allen Poe have any Children?

*January 10, 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 who ...

*November 26, 2007*

**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 a protective barrier ...

*October 1, 2007*

**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 . an official ...

*October 1, 2007*

**Math**

If 10% of 10% of a certain number is 2, this certain number is... A.)20 B.)100 C.)120 D.)200

*September 6, 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 http://www.nifg....

*April 11, 2007*

**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 (expropriating) it from the ...

*February 9, 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 question? 0.10 x...

*January 29, 2007*

**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 you: x1000 x100 x10 ...

*January 25, 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 average after the high ...

*January 25, 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 way to solve these ...

*January 25, 2007*

**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 sixth bounce? 72/(2...

*January 24, 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 photos to remember her...

*January 24, 2007*

**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 square feet. find the...

*January 24, 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 .43. That answer ...

*January 23, 2007*

**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

*January 23, 2007*

**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 total can you help me lance?

*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 way.) You can attach ...

*January 23, 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 tens place 3

*January 22, 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.... (.7)(3) + 2(.99) + 2(2....

*January 22, 2007*

**math**

insert perenthesis to make the sentence true: 40-6x6-2-6=10 40-6x(6-2)-6=10 hey

*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"

*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 = ...

*January 22, 2007*

**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? Explain how you got...

*January 17, 2007*

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