Sunday

August 2, 2015

August 2, 2015

Total # Posts: 261

**chemistry**

If 765000 J of energy are added to 7.90 L of water at 291 K, what will the final temperature of the water be? Answer in units of K.
*April 30, 2015*

**math**

The 1st,5th,13th term of an arithmetic sequence are the first 3 terms of geometric sequence with a common ratio of 2. If the 21st term of the arithmetic sequence is 72, calculate the sum of the first 10 terms of the geometric sequence.
*April 9, 2015*

**Math 115**

A manufacture has been selling 1400 television sets a week at $480 each. A market survey indicates that for each $24 rebate offered to a buyer, the number of sets sold will increase by 240 per week. a) Find the price p(x) of each television as a function of x, where x is the ...
*March 26, 2015*

**Math 115**

The manager of a large apartment complex knows from experience that 90 units will be occupied if the rent is 444 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 6 dollar increase in rent. Similarly, one ...
*March 26, 2015*

**Math 115**

A fence is to be built to enclose a rectangular area of 320 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most ...
*March 26, 2015*

**Math 115**

The revenue from selling q items is R(q)=475q−q2, and the total cost is C(q)=175+6q. Write a function that gives the total profit earned, and find the quantity which maximizes the profit.
*March 26, 2015*

**math**

The height of a baseball (h) in meters (t) seconds after it has been tossed out a window is given by the equation h= -5t^2 + 20t + 15. A boy shoots at the baseball with a trajectory of h= 3t +3. Will the paintball hit the baseball? If so at what height and time?
*March 22, 2015*

**Science**

Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?
*March 13, 2015*

**physics**

A 1-m-tall barrel is closed on top except for a thin pipe extending 5.2m up from the top. When the barrel is filled with water up to the base of the pipe (1 m deep) the water pressure on the bottom of the barrel is 10 kPa. What is the pressure on the bottom when water is added...
*February 26, 2015*

**chemistry**

formic acid is a weak acid with a ka value of 1.8x10^-4 at 25 celsius a solution with a concentration of .424M formic acid is prepared in a laboratory. 1) Write the ionization equation for an aqeous solution of formic acid 2)determine the ph of the solution prepared above. i ...
*February 12, 2015*

**Math**

My divisor is 9, I am greater than 7 times 9, I am less than 8 times 9,my remainder is 7,what dividend am I ?
*January 15, 2015*

**Math**

Jeffrey biked to the store at 12 miles an hour but took his time on the way home going 8 miles an hour. If it took him 20 minutes to get to the store, how many minutes did it take him to get back?
*January 13, 2015*

**Math **

Elizabeth took 13 minutes less than twice as long as Heather to solve the puzzle if their total time together was 23 minutes who took less time to solve the puzzle? How much less?
*January 13, 2015*

**Math**

The 80 8th graders took a trip. The boys numbered 16 fewer than twice the number of girls. How many of the eighth graders are girls?
*January 13, 2015*

**english**

I need help with finding some poetry devices in the poem: Wordsmith by Susan young. I already have some, but would love a second opinion.
*December 7, 2014*

**geography**

The environment of New York City includes water,land and air.It consists of high rise building or skyscraper.It is very busy and have lots of lights,it is the city that never sleep.
*October 6, 2014*

**geography**

How would you describe the environment of New York City?
*October 6, 2014*

**Math**

0.9
*June 1, 2014*

**Math **

Hannah made 0.7 of her free throw in a basketball game,abra made 9/10 of her free throws,dena made 3/4 of her free throws,who was the best shooter and explain why you say so
*June 1, 2014*

**Math**

Amita decides that she wants the molds to have a square base.How many of the possible molds can she use?
*May 21, 2014*

**science**

2.27 m/s to the north
*May 14, 2014*

**Calculus**

A ball is thrown vertically upward with an initial velocity of 135 feet per second, the ball’s height after t second is s(t) = 135t – 22t How to calculate average velocity from 1 to 3 seconds?
*March 22, 2014*

**Math**

A kaleidoscope is a tube-shaped instrument that contains mirror and colored glass. When a viewer looks in one end, (s)he sees vibrant, changing patterns. Tami sees a kaleidoscope in the shape of triangular prism. It has a height of 4 inches, a base of 5 inches and a depth of 8...
*March 18, 2014*

**Math**

Thank you but it would have been better if you told me how to answer it not the answers
*March 15, 2014*

**Math**

1 Catriona is deciding how large of a cake to order for a party. She can choose from a 1-layer cake that serves 10 people, a 2-layer cake that serves 20 people, a 3-layer cake that serves 40 people, or a 4-layer cake that serves 65 people. The cost of the cake increases with ...
*March 15, 2014*

**math**

what is she made a 8 out of 22
*February 18, 2014*

**math**

lenzy has a 77 a c. as a grade. if she fails a test worth 26% 0/22 what will her grade be
*February 18, 2014*

**language arts(CHECK ANSWERS)**

please check these answers there really quick. 11.the zoo has recently acquired pandas,giraffes and lions. were does a comma belong? A. After and B. After zoo C. After giraffes(I PICK THIS) D. After acquired 12.Hector would you please relax? where does a comma belong? A. After...
*February 18, 2014*

**Economy (vehicles)**

What is a bi-wheel vehicle?
*November 20, 2013*

**Physics**

The road runner drops a boulder from a 53 meter high building. When the block is 14 meters above the ground, the 2 meter tall Wiley Coyote looks up and sees the boulder. How much time does he have to get out of the way?
*November 3, 2013*

**physics**

Larry stands on a bathroom scale while riding up in an elevator. His mass is 75 kg. At the current time the scale reads 100 lb. assuming the upward direction is regarded as positive, what is Larry’s acceleration in m/s2? What is happening to the elevator at this instant (...
*October 22, 2013*

**Biomechanics**

Larry stands on a bathroom scale while riding up in an elevator. His mass is 75 kg. At the current time the scale reads 100 lb. assuming the upward direction is regarded as positive, what is Larry’s acceleration in m/s2? What is happening to the elevator at this instant (...
*October 22, 2013*

**English**

I think this is C if not Which analogy would best go with this one? branch:tree:: A. flower:garden B. teo:three C. tentacle:octopus D. near:far
*October 13, 2013*

**English**

Would this be D if not Which analogy would best go with this one? A:Z:: A. girl:mother B. weight:pounds C. truth:lie D. prologue: epilogue
*October 13, 2013*

**English**

Whish analogy would best go with this one? A:Z:: A. girl:mother B. weight:pounds C. truth:lie D. prologue: epilogue
*October 13, 2013*

**english**

Create an accurate summary of “The Cold Equations” that details the important events of the story. Provide your answer in three to five sentences. Can someone help me with this please?
*September 19, 2013*

**Algebra **

One side of a triangle is 3 inches shorter than twice the length of the shortest side. The third side is 5 inches longer than the shortest side. If the perimeter is 110 inches, find the lengths of all three sides. So what are all the three sides?
*September 12, 2013*

**Math**

(2x2)-(3x2x-3)-(2x-3x2) 4 - 18 - -12 -14 - -12 -2
*September 12, 2013*

**Algebra **

When setting the price of admission tickets for the amusement park, Tabitha wants the price for a two child, two- adult family to be $100. She also wants the adult tickets to cost $8 more than twice the cost of a child's ticket. How much should a child"s ticket cost?
*September 12, 2013*

**geometry **

Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x. Figures are not drawn to scale. m<P=14
*May 24, 2013*

**Advanced Functions/Trig**

Prove the identity: cos^4 x + sin^4 x = 1 - (1/2)sin^2 (2x)
*May 5, 2013*

**Algebra**

How many hands of 5 cards can be made from a standard deck of cards such that each hand contains exactly 1 red card and 4 black cards?
*May 2, 2013*

**Chemistry 12**

Determine the molar solubility of lead(II) iodide, PbI2, in 0.050 mol/L NaI. Ksp of PbI2 = 9.8 x 10^(-9)
*April 23, 2013*

**Advanced Functions/Trig**

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)
*April 21, 2013*

**Physics**

The electric field lines surrounding three charges are shown in the figure below. The center charge is q2 = -15.9 µC.
*April 2, 2013*

**Math**

80=20 divide 5
*March 22, 2013*

**Math**

What is the mathematical expression for 80 is 20 times as many as 5?
*March 22, 2013*

**Math**

How many frequent flyer point Indira earn if she traveled from new York city to Berlin ,Germany at a distance of 3,965
*March 21, 2013*

**Writing**

Compare how beaver stole fire and stealing fire from Zeus are the same
*March 20, 2013*

**Math**

Thanks
*March 12, 2013*

**Math **

How many strips of paper 4inches long and 1 inch wide can be cut from a piece of paper 8 inches long and 6 inches wide
*March 12, 2013*

**Math**

Thanks
*March 12, 2013*

**Math **

If there are 12 square tiles and each tile measure 1 foot on each side ,how many non congruent rectangle can you make.Each rectangle must use all 12 tiles
*March 12, 2013*

**Math**

If you h ave an 8 inches long and 36 inches wide strip ,how many strips of wood can you have if it is 4 inches long and 1 inch wide
*March 12, 2013*

**Math**

How many strips of wood can you have from an 8 inches long and 36 inches wide if the strips are 4 inches long 1 inch wide
*March 12, 2013*

**Math**

You will get 6 pieces
*March 12, 2013*

**Math**

How many strips of paper 4 inches long and 1 inch wide can be cut from a piece of paper 8 inches long and 6 inches wide
*March 12, 2013*

**Math**

12 feet
*March 12, 2013*

**Math**

Ms Washington buy a refrigerator that is 6 feet high, 3feet deep and 4 feet wide ,how many floor space does she need to fit the refrigerator
*March 12, 2013*

**Math**

List all 3digit numbers for which the sum of the digit is 3
*March 12, 2013*

**Math**

List all 2 digit numbers for which the sum of the digit is 5
*March 12, 2013*

**Math**

I think it's all the 2 digit numbers that when divided is equal to 5 ,e.g 10,15,20,25,30,35,etc.
*March 12, 2013*

**Chemistry**

How can I find the initial rate of formation of products {mol/((L)(s))}?
*March 2, 2013*

**Chemistry**

I'm getting really high negative percentage numbers.
*February 4, 2013*

**Chemistry**

But @DrBob222 where would I find delta T? Also, mass of water is 250 grams.
*February 4, 2013*

**Chemistry**

Sorry. There are 250.00g of water.
*February 4, 2013*

**Chemistry**

The complete combustion of 1.00 ml of octane increases the temperature by 22.7 degrees celsius. The density of octane is 0.7g/mL. What is the efficiency of the octane in heating the water?
*February 4, 2013*

**math**

t is 6
*January 30, 2013*

**math**

what is 4t=24?
*January 30, 2013*

**Chemistry 12**

Solid phosphorous is found in two forms: white phosphorous (P4) and red phosphorous (P). White phosphorous is the standard state. The enthalpy of the formation of red phosphorus is -17.6kJ. When 32.6 g of white phosphorous reacts to form red phosphorous. What is the enthalpy ...
*January 18, 2013*

**Algebra 2**

Simplify sqrt80 -3 Sqrt63 - sqrt125 - sqrt175
*January 18, 2013*

**Advanced Functions**

How do I verify this identity? (I've tried a lot but it's just not working) (sin2x + sin2y) = 2sin(x+y)cos(x-y)
*January 17, 2013*

**Physics to be solved**

a horizontal scaffold, of length 2.00 m and uniform mass 50.0 kg, is suspended from a building by two cables. The scaffold has dozens of paint cans stacked on it at various points. The total mass of the paint cans is 79.5 kg. The tension in the cable at the right is 837 N. How...
*January 14, 2013*

**Physics**

The driver of a car on a horizontal road makes an emergency stop by applying the brakes so that all four wheels lock and skid along the road. The coefficient of kinetic friction between tires and road is 0.39. The separation between the front and rear axles is L = 4.1 m, and ...
*January 14, 2013*

**Calculus**

evaluate each limit, if it exists [(2+x)^2 - 16]/ (x-2) what do I do?
*December 22, 2012*

**Chemistry**

given: 25.9 kJ + 1/2 H2 + 1/2 I2 => HI how much energy is needed for the reaction of 4.57x10^24 molecules of iodine, I2, with excess hydrogen, H2?
*December 18, 2012*

**5th grade math**

is there more?
*December 16, 2012*

**5th grade math**

13 ways 2q1d0n 2q0d2n 0q0d12n 1q1d5n 1q0d7n 0q6d0n 0q1d10n 1q3d1n 0q3d6n 0q5d2n 0q4d4n 1q2d3n 0q2d8n
*December 16, 2012*

**5th grade math**

how many ways can you use a dime, quarter, and nickel to make .60 cents?
*December 16, 2012*

**Math**

i667(.)photobucket(.)com/albums/vv40/KuroKami444/PG227NO29(.)jpg the image (remove brackets)
*December 12, 2012*

**Math**

use the unit circle to prove that tan(x/2) = (sin(x))/(1+cos(x))
*December 12, 2012*

**math**

y=mx t b ax t by=c ax t by t c= 0 Need every question for all 3 above how do u do these im so confused i need help! thanks 8) Through (4,0) and slope of -1 0) through (4,5) with slope -8 10) through (-2,4) with slope 7 over 3 11)through (-2,-1) with slope of 0 13)through (3,2...
*December 3, 2012*

**PreAlgebra**

Volume of a cube with side length of 26.4 meters I need this by 11/21/12 ASAP
*November 27, 2012*

**Chemistry**

2.24*10^7
*November 22, 2012*

**math**

Anthony earns an allowance for doing work at home .the first day he earns $1. ,$2. for the next two days,$3.for the next three days and so on and so on.If Anthony keep earning money this way ,on what day will he earn $6.?(2)Anthony saves all the money he earn to buy a $59.99 ...
*November 20, 2012*

**Physics**

That is not the answer. Thats what I thought it was but its not.
*November 20, 2012*

**Physics**

A box is being pushed to the left parallel to the x-axis by a force of 23.0 N. A rope provides a second force of 33.8 N on the box, directed to the right at an angle of 39.0 deg. from the x-axis. What is the magnitude of the net force acting on the box ?
*November 20, 2012*

**Physical scince**

What are the equations for potential and kinetic energy?
*November 14, 2012*

**math**

how do you write the number words for 0.03. Is it three hundredths.(2)and the number words for 0.76,is it seven tenths,six hundredths
*November 14, 2012*

**math**

How do you write the following digit:five thousandths.Does this right,0.005
*November 14, 2012*

**Physics**

A uniform, solid, spherical asteroid with mass 1.2 * 10^13 kg and radius 1.0 km is rotating with a period of 4.6 hours. A meteoroid moving in the asteroid's equatorial plane crashes into the equator at 9.0 km/s. It hits at a 58° angle to the vertical and embeds itself ...
*November 9, 2012*

**science**

i have a science test on monday,but i misplace my paper that i have to study on can you please give me some ideas what to study for photosynthesis
*October 26, 2012*

**math**

3.277, 3.274, 3.27
*October 24, 2012*

**math**

greater.
*October 24, 2012*

**ap stats-- probability**

over a 5 year period of time, 80% of winter days in Philadelphia had an average temperature above freezing. 20% of those days had precipitation. Of the days with an average temperature below freezing, 15% had precipitation. A winter day is chosen at random. Find the ...
*October 24, 2012*

**5th grade word problems**

60
*October 24, 2012*

**math**

which is greater, 100^10 or 10^100? explain reasoning.
*October 18, 2012*

**Math**

How many times larger is 2,300,000 sq. miles than 1,200,000 sq. miles?
*October 18, 2012*

**Math**

What is the percent increase from 91,400,000 to 94,400,000?
*October 18, 2012*

**gr 9 math**

3=3 ..-(P-1) 4
*October 18, 2012*