Friday
October 24, 2014

Posts by walter


Total # Posts: 85

Biology
I need help with the life cycle of an ostrich! And what could go wrong with the development. I don't understand if it's bacterial or viral infections that may occur...
October 9, 2014

math
i am a number between 5 and 10. my decimal is in tenths. the sum of my digits is 10. what number could i be?
October 3, 2014

math
what is the integral of sin^5(6x)dx
June 27, 2014

Chemistry
From the following data at 25°C, H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ Calculate ΔH0 at 25°C for the reaction below. 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)
June 18, 2014

Geometry
at 10 feet away from the base of a tree, angle the top of a tree males with the ground is 61 degrees. of the tree grows at an angle of 78 degress with the respect to the ground, how tall is the tree to the nearest foot?
June 1, 2014

Physics
I'm having trouble setting up/solving this physics problem? Can someone please help me? Thank you. A 4700 kg lunar lander is in orbit 45 km above the surface of the moon. It needs to move out to a 340-km-high orbit in order to link up with the mother ship that will take ...
April 4, 2014

Math
Historically, an acre was the amount of land that an ox could plow in one day, which was deemed to be 4,840 square yards. Supposing that an ox could plow 4,840 square yards in a day, how manyyears would it take an ox to plow a square mile?
March 26, 2014

Math
The Brock family uses a 12-cup coffee maker, which leaks. For every 6 cup of coffee brewed, 1/12 cup leaks out. Mrs. Brock makes a full pot. If 4 coffee drinkers receive the same amount, how many cups (use a mixed number) will each individual receive?
March 26, 2014

Math
Jan is making a 3-tier wedding cake for 300 guests. She will make the cake for $3 per serving with the following specifications: -Each serving is 4 inch.3 -Each tier must be smaller than the tier below it. -Each square tier is 4 in. tall with a side length of 16 in., 14 in., ...
March 26, 2014

Science
a layer of ice has an area of 35m2 and is 2.5cm thick and is -7.5'c. how much water (in kilograms) is needed to melt the ice?
March 22, 2014

Trigonometry
Consider the triangle ABC. Suppose that C=69 degrees, a=45 and b= 9 Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth. List all solutions A= B= c=
March 18, 2014

Mathematics
Suppose that 4 people sit in 4 chairs in a circle. How many different new seating arrangements are possible if each person can move 1 chair to the left or right or remain as is and if 1 person must be in each chair?
March 12, 2014

Science/Math
A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem is: Basic Biomechanics ...
September 30, 2013

Science/Math
John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the word problem is: Basic ...
September 30, 2013

Math/Science
Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10 percent in B & S (...
September 30, 2013

Science/Math
Math Problem page 18 Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10...
September 29, 2013

Science/Math
Word Problem page 19 John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the ...
September 29, 2013

Science/Math
Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem...
September 29, 2013

Basic Biomechanics
A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?
September 29, 2013

Basic Biomechanics
John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
September 29, 2013

Basic Biomechanics
Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, New shoes at $12 per share, and Capital beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S. With market values ...
September 29, 2013

Biomechanics
A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?
September 27, 2013

Biomechanics
John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
September 27, 2013

Basic Biomechanics
Wendell invests $10,000 in a stock por5tfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans & Sprouts at $2.50 per share. He places 60% of the money in P.S., 30% in N, and 10% in B & S. With market values changing (P.S. down $3.12, N up 80...
September 27, 2013

math
The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet? A.5 and 3y B.5 and 3 + y C.5 and 5 + y D.3 and 5 + 3y
July 16, 2013

luella high
to Steve these are the choices A. 5 and 3y B. 5 and 3 + y C. 5 and 5 + y D. 3 and 5 + 3y
July 16, 2013

luella high
The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet?
July 16, 2013

chemistry
How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL
March 26, 2013

Chemistry 104
A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)
March 8, 2013

Chemistry 104
A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)
March 8, 2013

writing skills
i need to write a essay on writing skills and writing assignment
October 31, 2012

ap stats
Minimum stays the same. Q1 might increase or stay the same. Median might increase or stay the same. Q3 might increase or stay the same. Maximum will increase. Mean will increase. Standard deviation will increase. Minimum and maximum should be obvious. Q1, median and Q3 are ...
August 28, 2012

Physics HELP
an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at algebra
June 16, 2012

statistics
The Deborah Heart Institute performs many open-heart surgery procedures. Recently research physicians at the Institute developed a new heart bypass procedure that they believe reduces the average length of recovery. The hospital board will not adopt the procedure unless there ...
April 18, 2012

Statistics
Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the contract development is an...
April 4, 2012

math
five hundred dollars
March 12, 2012

chemistry
For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d...
January 23, 2012

chemistry
For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d...
January 23, 2012

healthcare administration
◦What do you feel are the biggest weaknesses of the health care plan, and why? ◦Be sure to provide 2–3 weaknesses for each group (i.e. providers and patients), and explain your rationale for choosing each by supporting your thoughts with properly cited ...
November 22, 2011

math
one side of a square is decreased by 20% while its adjecent side is increased by 10%% forming a new rectangle. the area of the new rectangle formed is what percentage of the area of the original square?
October 18, 2011

Physics
A small rock is thrown vertically upward with a speed of 13.0 m/s from the edge of the roof of a 20.0 m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A.) What is the speed of the rock ...
September 10, 2011

American Government
The answer is C. I just finished this course.
July 11, 2011

modern physics - relativity
A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it . (A) what is the velocity of resulting composite particle ? (B) What is the mass of the resulting composite particle ? use conservasion of energy / momentum please show working
June 7, 2011

relativity
Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the minimum photon energy ...
June 7, 2011

relativity
A particle called neutral pi meson (or pion) decays into two photons (and nothing else).If the pion (whose rest mass is 135Mev) is initially at rest, What are the energies of the photons? How are they moving with respect to each other ?
June 7, 2011

Life orientation
Environmental problem
May 12, 2011

Basic Math
1/4 = 15/60 1/5 = 12/60 What do you think?
February 14, 2011

Basic Math
Okay, Now that the common demoninator is 60, I now multiply. But where do I start? for example, I just leave the 1 alone because its a whole number. So now I multiply the 1/2 to 1 * 30 = 30 and 2 * 30 = 60 Do I do the same for the 1/3 and so on?
February 14, 2011

Basic Math
I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem? Thanks, Walter, New York.
February 14, 2011

math
the lengths of corresponding sides of similar rectangles have a ratio of 7:4 the perimeter of the smaller rectangle is 80 ft. what is the peremiter of the larger rectangle?
February 4, 2011

science
You are designing a scale model of the solar system mercury it is 4,878 km in diameter.using the following scale factor, how large does your model of mercury need to be? A. 160cm B. 16cm C.146cm D.30cm
January 26, 2011

Math
it has a 4 added to it every time. but it just doesnt sound right because 4+4 is 8 not 44 so what other word can i use? * sorry its *going and *each and d) is like 1*2=2, 2*3=6, 6*7=42, 42*43=1806, 1806*1807=3263442 but i do not know how to put it into words.
December 17, 2010

Math
ya i cant describ things very well and a) was easy i think i got c) c)starting with two and ging up by multiplying wach new # by 5 i cant figure out the rest
December 17, 2010

Math
can u just tell me in sentences? i do not know how to put them into words.
December 17, 2010

Math
make a conjecture (obsevations based on patterns) for each sequence below. a)7,10,13,16 b)4,44,444,4444,44444 c)2,10,50,250 d)1,2,6,42,1806,3263442
December 17, 2010

Math
start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.
December 16, 2010

Biomechanics
A pitched ball with a mass of 1 kg reaches a catcher's glove traveling at a velocity of 28 m/s. How much momentum does the ball have? how much impulse is required to stop the ball? If the ball is in contact with the catcher's glove for 0.5 s during the catch, how much ...
November 21, 2010

English
Devil in the White City Chicago World's Fair benefits and downfalls... I need to write an essay on The Devil in the White City. I read the book and i have a pretty firm grasp on it, but im still having trouble finding events and ideas that occur that happen in the Gilded ...
September 15, 2010

algebra
thanks. i wasnt sure whether to divide n or divide the four, that's all. -walter
September 6, 2010

algebra
When the quotient of a certain number and 6 is decreased by 14, the result is 4 find the number.
September 6, 2010

spanish
ayer maria y Javier _______ a la playa con sus amigos.______ 2. La pelicula del sabado por la tarde __________ muy bonita.___________
February 23, 2010

Algebra II
Y=-16X^2+100X+6 where x is the time in seconds and Y is the height in feet. find the zeros of the function? What do the zeros represent and are they realistic? and about how high does the rocket fly before hitting the ground?
February 14, 2010

Math-Fair Game question
What is the answer of is finish first a fair game
January 23, 2010

com 140 Contemporary Business Communication
Characteristics of Interpersonal Communication Im having a little problem with this assignment not really sure what to do. There are 2 section on ths assignment 1 is Instructor message and 2 is Class mate message. In each section ther are 4 categories and the are. *PURPOSE *...
April 8, 2009

arithmetic math
For each of the following expressions, show each step a student would folow to mentally perform the calculations in the whole numbers. For each step, identify the law, definition , axiom ec that was used to roduce that step. 345+641+255+359
January 25, 2009

basic math
say i have something like (2/3)-(1/3) ---------------- 3 do i multiply the top this way (1/3)(3/1) by flipping the denominator or multiply it like this (1/3)(1/3)
May 15, 2008

trig
Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta
April 8, 2008

trig
If a = 5 cm and b = 3cm, use the Pythagorean Theorem to find c
April 8, 2008

chemistry
Given the equilibrium system PCl5(g) <---> PCl3(g) + Cl2(g) K = 12.5 at 60 degrees Celsius. A 1.0-L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCL3(g) and 3.0 mol PCl5(g). Show that the reaction mixture has not yet reached equilibrium
April 8, 2008

Accounting question..
Having trouble figuring out how to do this problem for my accounting homework.. any help would be greatly appreciated..the information given goes as follows.. On 1/1/08 you issue $400,000 of 7%, 10 year bonds that pay intrest semiannually. The Market intrest rate is 8% The ...
November 27, 2007

maths
solve for x 8=6^x using logs
November 12, 2007

maths
solve for x
November 12, 2007

maths
solve the following equation for x
November 12, 2007

algebra
can you show how to solve for x x+1/x + 6/2x-3 =0
November 1, 2007

maths
factorise the following equation 680x3-1407x2-614x+285 where x2 x3 mean x to the power of
October 26, 2007

maths
solve the following equation for x (x+1/x) + (6/2x-3)=0
October 23, 2007

maths
rearrange the following equation to find x in terms of y and t y(y-x)=3t(3t+x)
October 23, 2007

algebra
solve the following simultaneous equation algebraically,for a and b 8a+5b=23 12a+3b=12
October 23, 2007

chemistry
if you added sulfuric acid to calcium nitrate what products in addition to calcium sulphate would you get if any ? if you start with calcium nitrate mixed into H2SO4 (aq), wouldn't you get a solution of nitric acid? H2SO4 + Ca(NO3)2 >>> 2 HNO3(aq) + CaSO4(s)
August 13, 2007

chemistry
write a balanced chemical equation for calcium nitate plus sulfuric acid produces calcium sulphate and ? This is a metathetical reaction, I think more properly called a double displacement reaction now. Just change + and - partners. Ca(NO3)2 + H2SO4 ==> CaSO4 + HNO3. I will...
August 9, 2007

chemistry
Given a solution in moles per litre how would you convert to parts per million)ppm.) could you help,no other information given apart from solution contains a known concentation of aluminium mols/L. Convert mols to grams. That will be grams per 1000 mL. Convert that to mg/L. ...
August 9, 2007

chemistry
calcium nitrate + sulfuric acid =caso4+? write a balanced chemical equation for this reaction including states. Ca(NO3)2 + H2SO4 ==> CaSO4 + 2HNO3 You don't have enough information to provide states. CaSO4 will be a solid so you write CaSO4(s). H2SO4 will be (l) if it ...
July 30, 2007

chemistry
write a balanced chemical equation for the following reaction including states not complete; no question.
July 30, 2007

Math
Show me how to solve problems like this. 1.) 7 + (-9) + (-5) + 6 2.) [(-3)(-4)(-5)]/ (-2)(-3)] Try reading the following sites' pages very carefully. Then make an attempt at doing the problem, and we'll see if you got it right: http://www.jiskha.com/mathematics/algebra...
June 6, 2007

math proportions
17/32 = x/100 1700 = 32x x= 53 1/8 Am I right? yep
February 25, 2007

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