Monday
December 22, 2014

Posts by alan


Total # Posts: 337

Physics
The resonator of a string instrument is commonly an oddly shaped box or a wide thin board. The resonator is not sharply tuned; it responds to broad bands of frequencies and radiates sound at those frequencies from its entire surface area. The response of the body or soundboard...
December 20, 2014

History
Was the only change in science in quantum physics and relativity? I know it changed the way people thought about the predictability of human nature during the enlightenment and the 1st scientific revolution, but how did this contribute to the age of anxiety? I don't ...
December 18, 2014

History
I have to write a 150-200 word essay on it
December 18, 2014

History
What were the major changes in sciences view of the nature of the universe and humanity's place in it between 1850 and 1914? How did these developments contribute to the age of anxiety? How are these changes reflected in philosophy, psychoanalysis, and artistic style ...
December 18, 2014

AP Calc
Wait don't you plus x=14 back in to y=(84-4x)? Cause y then equals 20 in
December 1, 2014

AP Calc
The US Post Office has a limit on the size of packages it will accept for mailing. The length plus the girth must be 84 inches or less. Find the dimensions of the rectangular package with a square end, which will maximize the volume of the package.
December 1, 2014

MATH
Mimi's Market sold 24 heads of lettuce one morning. That afternoon 2/7 of the remaining heads of lettuce were sold. The number of heads left was now 1/2 of the number the market had at the beginning of the day. How many heads of lettuce were there at the beginning of the day?
November 17, 2014

math/set theory
120 quilts were entered into a quilt show. (Traditionally, all quilts were hand stitched but now many are stitched on machines. Appliques are additional pieces of cloth that are sewn on top of the quilt.) In this show, 86 were machine stitched. 44 had appliques applied. 24 ...
November 13, 2014

Social Studies
What are some lifestyles for the following countries: -Kazakhstan -Kyrgyzstan -Latvia -Liechtenstein
October 9, 2014

Physics
A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
October 7, 2014

Physics
A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
October 7, 2014

Maths
Mathew is attending a very loud concert by the discarded. To avoid permanent ear damage he decides to move farther from the stage. Sound intensity is given by the formula I=k/d*d where k is the constant and d is the distance in metres from the listener to the source of the ...
October 1, 2014

math
Fred has 15 cows John has twice as many cows as Fred had when Fred had as many cows as John has now how many cows has John?
September 21, 2014

Organic Chemistry
What ketone or aldehyde would be reduced to produce each alcohol, respectively: a. 3,3-Dimethyl butan-2-ol b. 3-Methyl butan-1-ol c. Benzyl alcohol
May 24, 2014

Biology - Help!!
2 and 5 are wrong for anyone who may use this to answer their test
May 20, 2014

ch
A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL? Help please
April 23, 2014

Math
Evaluate the expression for the given value. x = 3; y = -5; z = -2 x(yz)^2 - 3(xyz)^0 + 2x^2yz^2 = 3(-5 * -2)^2 - 3(3 * -5 * -2)^0 + 2(3)^2(-5 * -2)^2 = 3 * 100 - 3 * 30 + 2 * 9 300 - 90 + 18 = 228
November 25, 2013

Please check this answer if this is correct.
-2(-2)^2 * 3 - 3(-2)(3)^2 * -1 - (-2)(-1) -2 * -4 * 3 - 3(-2) * 9 * -1 (-2)(-1) -2 * -4 * 3 - 6 * 9 * -1 * 2 24 - 108 = -84
November 24, 2013

Math
Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y - 3xy^2z - xz =
November 24, 2013

Chemistry
In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?
November 22, 2013

Chemistry
Which of the following statements must be True? Check all that apply. The number of Adenines in single-stranded DNA equals the number of Thymines. The number of Guanines in single-stranded DNA equals the number of Adenines. The number of Thymines in double-stranded DNA equals ...
November 21, 2013

Math
Solve the following: -6x + 3 <= 25
November 19, 2013

Math
Solve the following. 2(x + 1) - 4 <= 1/4(12x - 24)
November 19, 2013

Math
Evaluate when x = 2, y = -5, z = 3. x^2 - y = 3 3z - 4(y + 1) - y^2 = 0 x - yz = -13
November 19, 2013

Math
Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48
November 19, 2013

Math
Using the linear equation y = -3x + 5, complete the table of values (T-Chart) and choose the correct graph. X = -2 Y = _ X = -1 Y = _ X = 0 Y = _ X = 1 Y = _ X = 2 Y = _
November 19, 2013

Math
Using the linear equation y = 5, answer each of the following. Choose all points that would be on this line. (0,5), (5,5), (2,5), (5,2), (-3,5), or (5,-3)
November 18, 2013

Math
Find the x-intercept and the y-intercept of the linear equation 3x + 4y = 12. Write each intercept as an ordered pair.
November 18, 2013

Please check if these math questions are correct
8 = p - 5 Answer: p = 13 21 + y = 35 Answer: y = 14 6x = 54 Answer: x = 9
November 17, 2013

Math
Solve -4x is less then equal to -16. I got x is less then equal to 4. Is this correct I'm kind of confused with this question.
November 17, 2013

Math
Solve for X. X/8 = -4/9
November 17, 2013

Math
Evaluate the following expressions when x = -2, y = 6, and z = -4 y^2 + 3z 5y - 3(x^2 + 1) + z
November 16, 2013

Math
When driving to the beach, you drive 240 miles on 9 gallons of gas. When you arrive at the beach you fill up your gas tank. While there you drive 130 miles and use 5.8 gallons of gas. Round answers to 2 decimal places. What was your gas mileage driving to the beach? What was ...
November 16, 2013

Math
Choose True or False for each of the following. 87% is equivalent to 0.87 True or False 1.29 is equivalent to 129% True or False 0.5% is equivalent t0 0.05 True or False 5.6 is equivalent to 56% True or False
November 15, 2013

Math
Convert each of the following. Round your answer to two decimal places if necessary. 0.68 miles = 43084.80 inches 10259 feet = 3419 yards
November 15, 2013

Math
If a boat travels at 5 miles per hour, how many feet per second does it travel? Round your answer to two decimal places if necessary. 26400 feet per second
November 15, 2013

Math
Three friends go to their favorite seafood restaurant for dinner. They decide to order a crab cake appetizer. When it arrives there are only 2 crab cakes. What fraction of a crab cake will each friend get to eat? 3/2 Write the fraction as a decimal rounded to 2 decimal places...
November 14, 2013

Math
Your favorite chocolate chip cookie recipe makes 4 dozen cookies. Among the other ingredients, the recipe calls for > 1 cup of butter > 2 tsp vanilla extract > 3 cups of flour > 1/2 tsp salt You are asked to make 6 dozen cookies for a party. How much butter, ...
November 14, 2013

Math
Perform the indicated operation and simplify. 1. 1/4 + 1/3 = 2/3 2. 4/7 - 5/6 = 1/6 3. 3/5 * -4/7 = -12/35 4. 10/11 divided by 2/3 = 15/11
November 14, 2013

Math
Is 10.512 * 10^3 written in proper scientific notation? If not rewrite the number in proper scientific notation.
November 14, 2013

Math
You have a table in your living room with a round top that has a diameter of 2 1/2 feet. You would like to put a piece of glass over the top of the table to protect the surface. What is the area of the table top? (Use 3.14 for the value of pi). Write your answer as a mixed ...
November 14, 2013

Math
You pull into a gas station where the sign says the gas costs $3.679. To fill up your tank you need 20 1/2 gallons of gas. You plan to use your credit card to pay. Rounded to the nearest cent, what will the charge be on your credit card? $75
November 14, 2013

Math
Perform the indicated operation. Write your answer as a simplified fraction. 1. 1/3 + 0.25 = 7/12 2. 0.3125 - 1/4 = 1/16 3. -7/10 + 0.2 = -9/10
November 13, 2013

Math
Convert the following decimals to a simplified mixed number. 1. 0.33 = 1/3 2. 1.875 = 1 7/8
November 13, 2013

Math
You and your friend ordered a 12 inch pizza to split for lunch. How many square inches of pizza do you each get to eat? Round answer to 2 decimal places. 37.68 square inches
November 13, 2013

Math
You live 35 1/3 miles from your grandmother's house. You're workplace is 7 2/5 miles from your grandmother's house. If you drive by your grandmother's home on the way to work one morning, what is the total number of miles you drove that morning? Write your ...
November 13, 2013

Math
Multiply each of the following. Write your answer as a simplified fraction. 1. 4/7 * 5 = 20/7 2. 15/28 * 7/9 = 105/252 3. -3 1/5 * 7/8 = -56/20
November 13, 2013

Math
Add each of the following. Write answer as a simplified improper fraction. 1. 3/25 + 8/35 = 61/175 2. 5 1/4 + 3 5/12 = 26/3 3. -4 1/2 + 2 2/3 = -19/6
November 13, 2013

Math
-3 7/16 = -41/16 = -2.56 25/13 = 1.92
November 13, 2013

Math
Convert the following fractions to decimals. Round to 2 decimal places if necessary. 1. 1/4 2. -3 7/16 3. 25/13
November 13, 2013

Math
Simplify each of the following. 1. 42/48 2. -15/35 3. 119/210
November 12, 2013

Math
Write as an improper fraction. 1. 7 3/5 2. -12 1/2 3. 41 4/6
November 12, 2013

Math
Write as a mixed number. 1. 13/11 2. -33/6
November 12, 2013

Physics
186
October 15, 2013

6th grade social studies
What series of events led to the end of Egypts power in the Nile River Valley?
September 26, 2013

History
How did having few industries affect southerners. Can someone please help me with this question
September 2, 2013

chemistry
How many moles of H2O are needed to react with 15.0g of CaO forming Ca (OH)2? CaO + H2O --> Ca (OH)2
July 15, 2013

Math (Please help ASAP?)
I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f(3) B. Find x when f(x) = -21 Can somebody help me understand this??
May 31, 2013

Math
The parabola, B, represents a shuriken's maximum throwing distance, which was 60 meters of the enemy ninja, A, from a height of 7 meters. Figure out the trait of the enemy ninja that can be observed from the ellipse formed by the shuriken, and figure out the maximum ...
May 24, 2013

Chemistry
N-type silicon (Si) has been produced by doping with phosphorus (P). The charge-carrier population based on electrical conductivity measurments is determined to be 3.091*10^17 carriers/cm3 at room temperature. 1. Calculate the doping level of P (how much P has been added to ...
April 25, 2013

Chemistry
A glass of composition 85% SiO2 - 15% K2O is to be surface strengthened by ion exchange. To this end, two identical specimens approximately the size and shape of credit cards are soaked for the same amount of time at 850∘C. Sample A is soaked in NaCl and sample B is ...
April 13, 2013

Chemistry
Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.
February 23, 2013

Algebra
What is x when 6(x+4)+4(x+5)=74
February 7, 2013

Algebra
What is x when 6(x+4)+4(x+5)=74
February 7, 2013

Algebra
Subtract. [2x/(x^2-y^2)]-[7/(y-x)] Thank you! :)
January 16, 2013

math
Lin-Yee is helping to set up a health clinic in Inuvik by collecting and shipping medical supplies from Calgary. She has found these shipping rates online: • regular rate: $2.10/lb • ship 101 to 500 lb, get a 20% discount • ship over 500 lb, get a 40% discount A...
January 15, 2013

math
A male moose is 2.6 m tall and 3.2 m long, with antlers that are 1.2 m across. An artist wants to carve scale models of the moose. She uses a scale factor of 1/30. a) What are the dimensions of the carvings to the nearest centimetre? b) How many carvings can she make using ...
January 14, 2013

math
The butcher shop sells a 3 lb package of chicken legs for $9.57. The supermarket sells chicken legs for $7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?
January 14, 2013

Pre-Calculus
A jet leaves an airport on a bearing of N 77* W and travels for 243 mi. It then turns and continues on a bearing of S 13* W for 104 mi. Find how far the jet is from the airport to 3 decimal places.
December 30, 2012

physics
Vf=Vi+at Vf=? Vi=19 m/s a=1.8 m/s^2 t=6.8 Vf is what are we are trying to find. So, Vf=(19 m/s)+(1.8 m/s^2)x(6.8s) Vf= 31.24 m/s But because of significant figures, our final answer would be 31 m/s.
October 23, 2012

math
Are those negative signs or subtraction signs? Just follow BEDMAS, Brackets, exponents, division, multiplication, addition subtraction. Do all those in that order and you should get the right number. It does not matter if you do Multiplication or divsion first.
October 12, 2012

math
how do i put 3.00x10 to the 8th into a calculator
September 29, 2012

Algebra
how do you use a table to find a solution to 4m - 5 = 11
September 11, 2012

compound interest
If I invest $30000 at 10% compound interest for eighteen years how much will i get
April 27, 2012

geometry
A cone is created from a paper circle with a 90° sector cut from it. The paper along the remaining circumference of the circle is the base of the cone. Find the radius of the base of the cone. Round to the nearest hundredth.
April 27, 2012

Calculus
Sketch the graph of f(x)=(x^2 + 2)/x^2 - 4. Fund the vertical and horizontal asymptotes, the critical points, the points of inflection and the concavity.
April 17, 2012

Calculus
Sketch the graph of f(x)=x+2/x-4. Find the vertical and horizontal asymptotes, critical points, concave up/down, and inflection points.
April 17, 2012

Calculus
Sketch the graph of f(x)=-x^4 + 4x^3 - 16x + 16: Find the critical points, concave up/down, inflection points, vertical asymptotes and horizontal asymptotes.
April 17, 2012

Calculus
Find the price elasticity of demand. The demand function for the product is p=40-2x
April 17, 2012

Calculus
Find the relative extrema and absolute extrema if any. Use the first derivative test for the function f(x)=x^3-3x+2
April 17, 2012

Calculus
Find the equation of the tangent line to the graph of √(xy)=x-2y at (4,1)
April 17, 2012

Calculus
Find the points at which f(x)=x^2(x+1)^3 has a horizontal tangent.
April 17, 2012

Chemistry
What amperage is required to plate out .250 mol Cr from a Cr+3 solution in a period of 8.00 h?
April 11, 2012

math
a rectangular security area is enclosed with 200 ft of fencing. if this rectangular area is arranged so that the ratio of the length to the width is 5/3, find the dimensions.
March 26, 2012

Econ
The New York Times cost $0.15 in 1970 and $0.75 in 2000. The average wage in manufacturing was $3.23 per hour in 1970 and $14.32 in 2000. a. By what percentage did the price of a newspaper rise? b. By what percentage did the wage rise? c. In each year, how many minutes does a ...
March 16, 2012

Port st lucie
Can you help me find a link that tells me some information on history of Port St Lucie? Please answer if you see this.
January 10, 2012

Calculus
If 27 J of work are needed to stretch a spring from 18 cm to 24 cm and 45 J are needed to stretch it from 24 cm to 30 cm, what is the natural length of the spring?
December 4, 2011

calculus
find the rms value of the function i=15(1-e^-1/2t) from t=0 to t=4
November 20, 2011

Physics180
we dont know the mass of the astroid, how do we use the equation you have provided?
November 5, 2011

Physics180
Tidal forces can break apart objects that orbit too close to a planet, producing rings like those of Saturn. Consider an asteroid 600km in radius, 65mm from Saturn's center. What's the difference in gravitational acceleration between the two sides of the asteroid?
November 5, 2011

physics
A simple harmonic oscillator has spring constant = 8.8N/m , amplitude = 11cm , and maximum speed 4.6 m/s. what is the speed at x=6cm?
October 20, 2011

Physics
A spring with k=42N/m is mounted horizontally at the edge of a 1.2m high table. The spring is compressed 5cm and a 25g pellet is placed at its end. When the spring is released,m how far horizontally from the edge of the table does the pellet strike the floor?
October 2, 2011

Statistics
A young guy is setting up a date for his girlfriend. He has the option of going to Chicago, Indianapolis, or staying in Lafayette. If he chooses Chicago, he has 10 choices for a play and 100 choices for a restaurant. If he opts of Indianapolis, he has 5 choices for a play and ...
September 8, 2011

math
Wonderful help. Thank you.
August 21, 2011

math
Thanks for your help, I guess we took different approaches to this so now I'm a little confused. Is it possible to explain a little clearer?
August 21, 2011

math
From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are 6 degrees and 13 degrees, respectively. The points and the tower are in the same vertical plane and the ...
August 21, 2011

Math
From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, and , respectively. The points and the tower are in the same vertical plane and the distance from A to B is 1...
August 21, 2011

math
Yes but why is it 45 degrees? I'm dividing 8 into 16 = .5 then cos-1 .5 = 60. Nothing I do is giving me 45 degrees. Hope you get notified when a thread is updated, I'm inclined to repost this incase. Thanks again for your great answering.
August 21, 2011

Mathematics
thank you
May 28, 2011

Mathematics
Hi, Can someone check this for me .. please A tuning fork has a wavelength 0f 136 centimetres. Given that the speed of sound is 340 metres per second what is the frequency of the tuning fork ?? Frequency = speed / wavelength Then 340 / 1.36m (136cm) = 250 Hz Thank you try to ...
May 28, 2011

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