Parker
Popular questions and responses by Parker
Economics
Which is an example of thinking at the margin? A. figuring out what you will give up and what you will gain by hiring a new worker B. thinking about whether or not to go on a vacation to a warm beach C. drawing plans to build an extra room on an old home
asked on March 31, 2015 
math
A square has a perimeter of 20 cm. The square is enlarged with a scale factor of 4. What is the side length of the new square?
asked on May 1, 2020 
chemistry
how many liters of oxygen are necessary for the combustion of 340 g of ethanol (c2h5OH) assuming the raction occurs at STP? no idea how to work this out
asked on May 18, 2013 
Calculus
An oil storage tank ruptures at time t = 0 and oil leaks from the tank at a rate of r(t) = 105e^−0.02t liters per minute. How much oil leaks out during the first hour? (Round your answer to the nearest liter.) I got 4974.35 and it was incorrect, any
asked on April 28, 2020 
Science
Two bumper cars collide and then move away from each other. How do the forces the bumper cars exert on each other compare?
asked on April 7, 2010 
Calculus
Suppose f '' is continuous on (−∞, ∞). (a) If f '(1) = 0 and f ''(1) = −1, what can you say about f ? 1)At x = 1, f has a local maximum. 2)At x = 1, f has a local minimum. 3)At x = 1, f has neither a maximum nor a minimum. 4)More information is
asked on April 2, 2020 
History
1. “… to overspread and to possess the whole of the continent which Providence has given us for the development of the great experiment of liberty and federated selfgovernment entrusted to us.” –John O’Sullivan The quote above can be most
asked on February 22, 2017 
physics
tom the cat is chasing jerry the mouse across the table surface at 1.5 m high, jerry steps out of the way and tom slides off the table at 5m/s. Where will tom hit the floof and what are the velocity components just before impact
asked on September 3, 2012 
Chemistry
Draw Lewis Structure for BrO3^ The textbook answer involves a central Br atom with one lone electron pair and five shared pairs (two double bonds and one single bonds). This gives Br twelve electrons rather than the typical eight. I understand that some
asked on August 6, 2012 
chemistry
The rate constant of the reaction between CO2 and OH  in aqueous solution to give the HCO3 ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units
asked on June 12, 2012 
trig
A cashier is unsure whether a group of customers ordered and ate a large or a medium pizza. Medium pizzas have a diameter of 12 inches and large pizzas have a diameter of 16 inches. All that remains is one crust that has an arc length of 4.25 inches. All
asked on September 28, 2011 
calculus
At noon, ship A is 10 nautical miles due west of ship B. Ship A is sailing west at 17 knots and ship B is sailing north at 20 knots. How fast (in knots) is the distance between the ships changing at 4 PM? (Note: 1 knot is a speed of 1 nautical mile per
asked on September 24, 2009 
Calc
A bacteria culture is growing at a rate of r(t) = 3e0.4t thousand bacteria per hour after t hours. How much did the bacteria population increase during the first two hours? (Round your answer to three decimal places.)
asked on April 28, 2020 
Calculus
The annual demand q for bottles of wine from a vineyard when the bottles are priced at p dollars each satisfies the equation qe0.04p = 6000. The price is currently $12 per bottle. Find the rate at which demand changes (with respect to time) if the price
asked on April 2, 2020 
Social studies
Compare and contrast the rise and fall of Germany and Japan during the period of world war ll  Can someone just comment links to some articles about this tyy
asked on May 11, 2019 
english
Can someone provide feedback on my intro to a body paragraph? Some say that police brutality is not a big issue in our country at the moment. They say that officers have the legal right to protect themselves and others using their best judgment, and we
asked on June 20, 2018 
Math
Insert grouping symbols to make each statement true. 4 • 2  2 to the power of 2 ➗ 9 + 2 = 6
asked on August 17, 2017 
Math
The bottom of a picture five feet tall is four feet above the level of an observer's eyes. How far from the wall on which the picture hangs should the observer stand in order that the picture subtends the greatest possible angle at the observer's eyes?
asked on April 23, 2017 
Science
The Richter Scale is based on measurements of the ____ of a seismic wave. A. Speed B. Frequency C. Intensity*** D. Amplitude
asked on April 5, 2017 
History
1. "If slavery is not wrong, nothing is wrong ... And yet I have never understood that the Presidency conferred upon me an unrestricted right to act officially upon this judgment and feeling ... I claim not to have controlled events, but confess plainly
asked on March 25, 2017 
Science Ecology
List at least three ways in which Grassland and Tundra biomes are similar.
asked on March 22, 2017 
Algebra
Find the first four terms of the sequence represented by the expression. 3n+5
asked on February 22, 2017 
history
Did Washington sign Jay's Treaty (1795) or was it just john jay & british
asked on January 20, 2017 
History
I have a choice of taking AP history my freshmen yr or Honors, from a tutors point of view, if am getting a 98 in history now, should I take the AP? I know this isn't really hw, but if you can give me any suggestions, I'd really appreciate it! Thanks! It's
asked on January 20, 2017 
maths
The total number of people in a survey is T. The number of males in the survey is x and the number of doctors is y. The number of doctors that are male is z. Write algebraic expressions for the following using any of the variables x, y, z and T. a. The
asked on October 31, 2016 
language
okay so what is a good topic that can be put in a 5 paragraph essay in less than 30 min? i need a 100%
asked on February 24, 2016 
Science
you started to run at 10km/h when you left your house and you arrived at school .5 hours later. assuming that your average acceleration was 30 /h2, how fast were you running when you arrived
asked on October 27, 2015 
Math
A shaded rectangle is 4ft by 6ft. Within the rectangle is another white rectangle 2 ft by 1 1/2 ft . What is the area of the rectangle that is not white?
asked on May 17, 2015 
Math
A court is 94ft long by 50ft wide.It contains 3 circles, each with a diameter of 12 ft. Two of the circles are located at the free throw line with "half of each circle shaded" and the third circle is at the center. Within the third shaded circle is another
asked on May 15, 2015 
math
The equation below shows how Mandy decides how much juice to buy for a party. In the equation, g is the number of gallons of juice she buys, and t is the length of the party in hours. g= 3t + 5
asked on March 25, 2015 
math/compound
Calculate the interest earned on an investment of 2500 invested at an interest rate of 6.15%/a compounded quarterly for 10 years.
asked on January 3, 2015 
Statistics
One survey by the American Medical Association showed that among 785 randomly selected people who completed four years of college, 81.7% do not smoke. Use a 0.01 significance level to test the claim that people who completed four years of college are more
asked on April 27, 2014 
Statistics
A simple random sample of 27 adult mice has a length standard deviation of 0.66 mm. Using a 0.10 level of significance, does it appear that these mice come from a population with a length standard deviation of 0.87 mm?
asked on April 27, 2014 
statistics
A random sample of 49 credit ratings is obtained, and it is found that they have a (sample) mean of 679.3 and a sample standard deviation of 95.9. Using a 0.05 level of significance, test the claim that these credit ratings are from a population with a
asked on April 27, 2014 
chemistry
A ground water source contains 2.5 mg of F ion per liter. a) what is the concentration of F ions in moles per liter? b) will CaF2 (Ksp = 2E10) precipitate when the concentration of Ca2+ = 5.0E3M?
asked on April 14, 2014 
chemistry
what is the boiling point of a solution of .01 mole of glucose(C6H22o6) in 200 g of water. kb=0.512C/m.
asked on April 3, 2013 
Chemistry
I need to calculate the redox potential for the following: 1/2 O2 + 2H+ + 2e H2O I'm using the formula E = E'_0 + RT\nF ln ([electron acceptor]/[electron donor]) The electron acceptor is H+, so I can use the concentration of that which is indicated by the
asked on September 19, 2012 
Chemistry
The biomass formula for a yeast is CH1.66 00.269 N0.194. The formula accounts for 92% of dry mass; the other 8% is inorganic material (ash). When grown on C6H14, the yield on biomass is 1.4 gcell/gsubstrate. What is the respiratory quotient (mole CO2
asked on September 4, 2012 
calculus
find the definite integral that is equivalent to lim n>infinity of sum over i=(1,n) n/(n^2+i^2) since definite integral of f(x) dx over (a,b) = lim n>infinity sum over i=(1,n) f(a + (ba)i/n) * (ba)/n then: f(a + (ba)i/n) * (ba)/n = n/(n^2+i^2)
asked on August 18, 2012 
calculus
Integrate sqrt(x^2 + 1) dx over [0,2*pi] I can substitute u=arctan x to get: Integrate (sec u)^3 du over [0,arctan(2*pi)] From there, I'm stuck. (thanks Count Iblis for your last help)
asked on July 6, 2012 
Calculus
"Leave the answer as a definite integral, but indicate how it could by evaluated by using the fundamental theorem of calculus." I solved the problem to a definite integral. Proceeding via the fundamental theorem, would involve finding the indefinite
asked on July 3, 2012 
Chemistry
For the reversible, onestep reaction A + B ARROW C + D, the forward rate constant is 35.9 1/(M·h) and the rate constant for the reverse reaction is 25.4 1/(M·h). The activation energy was found to be 33.0 kJ/mol for the forward reaction and 45.6 kJ/mol
asked on June 13, 2012 
Math
Posted a question on the 2/12/12 at 3:48PM and was never given an answer. Guess the math problem is too hard for anyone to solve. How do they expect me to answer it if no one else can? Thanks for your time. Parker.
asked on February 15, 2012 
Math
Hayley has 16 square boxes to make an array of rectangular shapes on a grid. Harry says if she uses 19 square boxes she will get more arrays. Do you aree or disagree with Harrys' claim? Explain your answer using prime and composite numbers. Use the
asked on February 12, 2012 
trig
A waterpark slide covers 100 feet of horizontal space and is 36 feet high. A new replacement slide will create an angle with the water surface that measures twice that of the original slide. The new slide will use the same horizontal space as the old
asked on October 18, 2011 
trig
Two pilots take off from the same airport. Mason heads due south. Nancy heads 23º west of south. After 400 land miles, how far is Nancy from Mason’s route? Round your answer to the nearest tenth of a mile. (Enter only the number.)(If someone had helped
asked on October 17, 2011 
trig
A hill rises from the horizontal at 15º. The road leading straight up the hill is 800 meters long. How much higher is the top of the hill than the base of the hill? Round to the nearest meter. (Enter only the number.)
asked on October 16, 2011 
trig
Alan is using the equation mg sin A = umg cos A to determine the coefficient of friction, u, between a flat rock and a metal ramp. Find u to the nearest hundredth, if the rock begins to slide at 19º.
asked on October 16, 2011 
Stats Question
People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence? Initial survey results indicate that standard deviation= 15.9 books.
asked on October 9, 2011 
trig
Solve for ¥è in the equation tan ¥è = 2.42 when 180¨¬ < ¥è < 360¨¬. Round your answer to the nearest tenth of a degree. (Enter only the number.)
asked on October 5, 2011 
trig
Solve sin ¥è = 0.204 for 90¨¬ < ¥è < 270¨¬. Give your answer to the nearest tenth of a degree.
asked on October 5, 2011 
trig
Triangle XYZ has vertexes at X(4, 5), Y(3, 5), and Z(3, 4). Find the measure of angle Y to the nearest degree.
asked on October 1, 2011 
trig
P(2, 9) is a point on the terminal side of è in standard position. What is the exact value of tan è?
asked on September 26, 2011 
spelling
3 adjective words left to unscramble 1)B+U+T+us 2)c+(what Mrs. Sprat couldn't eat)+a birds home 3)D+pain in the neck
asked on June 2, 2011 
spelling
3 adjective words left to unscramble B+U+T+us
asked on June 2, 2011 
Math
If tanA = the square root of 11, find tan2A
asked on May 16, 2011 
physics 11 grade
A hiker shouts toward a vertical cliff 789.5m away. The echo is heard 2.1s later. The wavelength of the sound is 12.3 m. What is the speed of the shout? What is the frequency? What is the period of the wave?
asked on March 13, 2011 
High School Physics
At rest, a swing is 23.7m above the ground. When Sam performs he always pulls the swing as high as he can to 45.5m. While performing Sam 88.1 kg, is moving pretty fast at his lowest point 23.7m above the ground. What is his kinetic energy at that point?
asked on February 19, 2011 
surveying
on a lake without any waves, how far from the shore is a sailboat when the top of 10 m mast disappears from view of a person whose eye height is one m above the water's edge
asked on February 3, 2011 
math
12(5)+(11)
asked on September 23, 2010 
Calculus
Water is being pumped into an inverted conical tank at a constant rate. The tank has height 12 meters and the diameter at the top is 4 meters. If the water level is rising at a rate of 26 centimeters per minute when the height of the water is 1 meters,
asked on September 25, 2009 
calculus
At noon, ship A is 10 nautical miles due west of ship B. Ship A is sailing west at 17 knots and ship B is sailing north at 20 knots. How fast (in knots) is the distance between the ships changing at 4 PM? (Note: 1 knot is a speed of 1 nautical mile per
asked on September 24, 2009 
4th grade
What is a region, continent, and hemisphere?
asked on August 27, 2009 
Math (Find the Value)
If 0 < (theta) and cos(theta)=0.5, then what is the value of cos(2theta)?
asked on August 14, 2009 
physics
tiny.cc[slash]cTtCg
asked on February 1, 2009 
social studies
What were the mummyshaped figures that worked in the afterlife's fields for the mummy called?
asked on October 15, 2007 
Math
Here's the direction I was given: Write an expression for the sequence in each table. 1  8 2  13 3  18 4  23 5  28 n  ___ Would I write n = 28+5 ?
asked on September 13, 2007 
English Lit
Describe an obstacle to working on teams. Explain how the team can overcome that obstacle.
asked on June 30, 2008 
Algebra
If you have these three origins: (0,0) (0,952) (863,0) How do you find the last point where the two lines intersect? Would really appreciate the help. Thanks. Parker, I'm not quite sure what the question asks. Three origins? Is this standard analytic
asked on July 12, 2006 
Management Science
1. Modeling is used to: a) Save time b) Save money c) Analyze to the fullest d) All of the above e) A and B, but not C
asked on June 15, 2006

Calculus
I looked at an example on slader and used the method they used. This was right tho, thank you!
posted on April 28, 2020 
Calculus
178 bottles per year
posted on April 2, 2020 
Reading
Asset is used as him as the asset. Asset is defined as someone or something that is important in a situation.
posted on March 1, 2020 
science
Thnx Susan 😀😀
posted on November 19, 2019 
Some help me Math
its B
posted on September 9, 2019 
Music
Choral/vocal :)
posted on May 11, 2019 
Music
Vocal and instrumental
posted on May 11, 2019 
science
The answer is false (:
posted on March 6, 2018 
algebra
A line of chorus girls.
posted on October 8, 2017 
History
Then is it A?
posted on March 25, 2017 
Art
The correct answers are 1.d 2.a 3.d 4.b 5. B
posted on March 7, 2017 
History
Thank you! :D
posted on February 22, 2017 
History
Manifest Destiny?
posted on February 22, 2017 
Algebra
Never mind found my answer
posted on February 22, 2017 
Social Studies
it was great britain
posted on February 20, 2017 
Edtech/History question~!
THX MAN
posted on October 28, 2016 
Physics
Unanswerable without the weight of the car to find its gravitational force and the ycomponent of its normal force
posted on October 5, 2016 
physics
thats not right. you forgot to square the x value. 0.30 should have been 0.09
posted on December 16, 2015 
Math
I provided the missing information but you have not responded. :=(
posted on May 17, 2015 
Economics
Im gonna go with A
posted on March 31, 2015 
Economics
im stuck between C or A
posted on March 31, 2015 
6th grade math
The equation below shows how Mandy decides how much juice to buy for a party. In the equation, g is the number of gallons of juice she buys, and t is the length of the party in hours. g=3t+5
posted on March 25, 2015 
math
Idek I need help!
posted on October 20, 2014 
calculus
f''(x) = 24x  18 f'(x) = 12x^2  18x + C Since f'(1) = 6, then 6 = 12(1)^2  18(1) + C 6 = 12  18 + C 6 = 6 + C C = 0 So f'(x) = 12x^2  18x f(x) = 4x^3  9x^2 + C Since f(2) = 0, then 0 = 4(2)^3  9(2)^2 + C 0 = 4(8)  9(4) + C 0 = 32  36 + C 0 =
posted on April 15, 2013 
calculus
nevermind, I got it. The trick was using trigonometric reduction formulas.
posted on July 6, 2012 
chemistry
i got the answer!
posted on June 12, 2012 
math
the lions ate up all the prophets :D this was a riddle on my math hw
posted on March 30, 2010 
calculus
It still says NOT CORRECT.
posted on September 25, 2009 
physics
Neither do I.
posted on February 1, 2009