Saturday

December 3, 2016
Total # Posts: 1,550

**chemistry**

is this correct? (1 x -943) - (2 x -497) + 77 -943 - 917 = -1860 so A?

*April 21, 2012*

**Algebra**

Please help solve Problem of the Week Waiting in line... The week before the big concert, five friends Alan, Ben, Cameron, Derryck, and Garrett, stood in line to buy tickets. There were other people there, but the five friends were in the line in the order listed above. The ...

*April 19, 2012*

**Chemistry**

CH4+2O2-->CO2+2H2O How many Liters of carbon dioxide will be produced at 24 degrees celcius and 725mm Hg from the combustion of a 15.0 gallon tank of methane? How much energy is associated with combusting a 15.0 gallon tank of methane?

*April 18, 2012*

**Chemistry**

Regular gasoline (C8H18) reacts with oxygen gas to form carbon dioxide gas and water vapor. If your tanks of gasoline holds about 10.5 kg of gasoline, how many liters of carbon dioxide are formed at 24 degrees Celcius and 725mm Hg from the combustion of one tank of gasoline?

*April 18, 2012*

**chem1151**

please me solve During an experiment to measure the efficacy of an antacid tablet, an antacid tablet was dissolved in deionized water. Then 75.0 milliliters of 0.268 M HCl solution were added to the flask containing the dissolved tablet. How many moles of HCl were added to ...

*April 15, 2012*

**chem stoichiometry **

Acetylene(C2H2) burns in oxygen to form carbon monoxide and water. How many liters of oxygen(at STP) are needed to burn 25.0 L of acetylene (at STP)?

*April 14, 2012*

**algebra**

A basketball player made 52 out of 65 free throws. What percent is this

*April 13, 2012*

**Algebra**

Snap to It... I snap my fingers now, in one second, I smap them again. I wait two seconds and snap them a third time. I wait 4 seconds before snapping them again. Then I wait eight, then sixteen, and the pattern continues. The interval between each snap doubles each time. How ...

*April 13, 2012*

**Algebra**

Snap to It... I snap my fingers now, in one second, I smap them again. I wait two seconds and snap them a third time. I wait 4 seconds before snapping them again. Then I wait eight, then sixteen, and the pattern continues. The interval between each snap doubles each time. How ...

*April 13, 2012*

**Chemistry**

Which of the following is the most effective buffer system for a pH value of 7.45? Assume all are 1M A. Carbonic acid and sodium bicarbonate B. Sodium bicarbonate and sodium carbonate C. Sodium dihydrogen phosphate and disodium hydrogen phosphate D Hydrogen cyanide and sodium ...

*April 11, 2012*

**chemistry **

please help Calculate the volume in mm3 of a slice of potato if it is cut into the shape of a rectangular prism (volume = length x width x height), which is 2.24 cm long, 0.84cm wide and 2.88cm high

*April 4, 2012*

**chemistry **

please help calculate the volume of a cylinder that is 4.476 mm in height and 17.00mm in diameter

*April 4, 2012*

**Math**

Use the local linear approximation to approximate a value for f (x)= sec 121 degrees.

*April 2, 2012*

**Math**

Corn is poured through a chute at the rate of 10ft^3 / min and falls in a conical pile whose bottom radius is always half the height. How fast is the circumference of the base changing when the pile is 8 feet high? Please explain

*April 2, 2012*

**Math**

A projectile is fired upward 200 ft from an observer. The height in feet of the projectile after t seconds is given by s=-16t2 + 180t. What is the rate of change of the angle of elevation of the observer to the projectile after 7 seconds? I don't understand how to get there!

*April 2, 2012*

**math**

If you invest $17,000 a year for 11 years, at 4% compounded monthly, what would the balance be at the end of 11 years?

*March 29, 2012*

**Religon**

Unscrable mastcrane

*March 25, 2012*

**algebra**

x squared + 8x + 32 = 11

*March 22, 2012*

**algebra**

5 6-penni nails & 3 10-pennie nails

*March 22, 2012*

**chem 1151 please help me **

1 The mass of the magnesium metal when performing the calculation of the ideal gas constant experiment... After all measurements have been taken and the stopper is removed from the eudiometer, the liquid in the beaker can be

*March 19, 2012*

**math**

Thank You so much. I will have to ask her teacher about the way she is being taught with adding the interest each year. Thank You again.

*March 15, 2012*

**math**

The teacher has her adding the interest each year seperately. I don't know.

*March 15, 2012*

**math**

I am cassandras mom very confused by the way she is being taught this. I took 275 X 7.5% X 4 = 82.50 + 275 =357.50. That's the answer I got. She has an answer of 341.62. So whos right?

*March 15, 2012*

**math**

$275 at 7.5% for 4 years?

*March 15, 2012*

**Chemistry**

The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 is a) 3.5 b) 3.0 c) 2.5
d) 2.2
e) -3.0 i got C by -log(3.0e-3) is this correct?

*March 14, 2012*

**English:Language Arts 1**

1999,I went to Disney World for vacation

*March 13, 2012*

**physics**

A ball with a horizontal speed of 1.25 {\rm m/s} rolls off a bench 1.00 {\rm m} above the floor. How long will it take the ball to hit the floor? How far from a point on the floor directly below the edge of the bench will the ball land?

*March 11, 2012*

**astronomy**

Suppose Mercury's rotation period were three-quarters of its orbital period. How many Mercury days would ther be in a Mercury year?

*March 11, 2012*

**statistics**

if the average number of textbooks in professors' offices is 16, the standard deviation is 5, and the average age of the professors is 43,with a standard deviation of 8 ,which data set is more variable ?

*March 10, 2012*

**chem**

If one started will 7.72g of copper (11) chloride, how many gram of copper could be produced ?

*March 10, 2012*

**chem1151 please help me**

275.1282

*March 8, 2012*

**chem1151 please help me**

If one started will 4.33g of copper(11) chloride , how may grams of copper could be produced?

*March 8, 2012*

**chem1151**

I don't understand it.Please help me!

*March 8, 2012*

**chem1151**

If 2.68 grams of Copper was recovered and you started with 8.94 grams of Copper(II)chloride,then what is the percent yield of the reaction?

*March 8, 2012*

**Singapore Math**

An animal shelter has 1008 cats, dogs and rabbits. The ratio of the number of dogs to the number of cats in the animal shelter is 3:7. The ratio of the number of rabbits to the number of dogs is 2:5. How many rabbits are there in the shelter?

*March 6, 2012*

**astronomy**

What is theratio of the luminosity per aquare meter coming from a part of the Sun that is 5800 K versus a sunspot where the temperature is 5000 K?

*March 5, 2012*

**astronomy**

How fast must a spaceship travel to reachthe center of the Galaxy (26,000 ly away) in 100 years "ship time"?

*March 5, 2012*

**Excel Graphs**

i'm having trouble getting my graph to come out right in the legend its posting everythin and only need 2 mts to show up how can i fix it

*March 5, 2012*

**astronomy**

How fast must a spacecraft travel to reach the center of our Galaxy (26,000 ly away) in 100 tears "ship time"?

*March 4, 2012*

**Astronomy**

thank you

*March 4, 2012*

**Astronomy**

What is the Lorentz factor for a spaceship traveling at 0.5c?

*March 4, 2012*

**Astronomy**

Thank you

*March 4, 2012*

**Astronomy**

The frequency of a radio transmitter is 90 megahertz. What is its wavelength?

*March 4, 2012*

**Chemistry**

so would the answer be B?

*February 29, 2012*

**Chemistry**

For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200C. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction?
A. 0.172 B. 0.150 C. 5.82 D. 6.67 E. 2.59

*February 29, 2012*

**Chemistry**

Using this data, 2 NO(g) + Cl2(g) == 2 NOCl(g) Kc = 3.20 X 10-3 NO2(g) == NO(g) + ½ O2(g) Kc = 3.93 calculate a value for Kc for the reaction,
NOCl (g) + ½ O2 (g) == NO2 (g) + ½ Cl2 (g)
A. 20.2 B. 2.06 X 10-4 C. 4.49 D. 4.84 X ...

*February 29, 2012*

**Chemistry**

Using this data, 2 NO(g) + Cl2(g) == 2 NOCl(g) Kc = 3.20 X 10-3 NO2(g) == NO(g) + ½ O2(g) Kc = 3.93 calculate a value for Kc for the reaction,
NOCl (g) + ½ O2 (g) == NO2 (g) + ½ Cl2 (g)
A. 20.2 B. 2.06 X 10-4 C. 4.49 D. 4.84 X ...

*February 29, 2012*

**math**

Olivia bought some school supplies. In the first store she spent half the money she had plus $6. In the second store she spent one third of what was left plus $6.In the last store she spent ¼ of what was left and came home with $6.How much did she start out with?

*February 27, 2012*

**money**

Olivia bought some school supplies. In the first store she spent half the money she had plus $6. In the second store she spent one third of what was left plus $6.In the last store she spent ¼ of what was left and came home with $6.How much did she start out with?

*February 27, 2012*

**Science**

What is a process that could cause an unconformity?

*February 26, 2012*

**Math**

Create a graph from this research In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading.

*February 23, 2012*

**chemistry**

134.82

*February 14, 2012*

**College mathematics 1**

The end of a 30 inch pendulum describes an arc of 6 inches through what angle does the pendulum swing?

*February 14, 2012*

**business finance**

answers to exam#06044200 do you have ?

*February 13, 2012*

**Chemistry**

I got it DrBob222 thank you anyway!

*February 8, 2012*

**Chemistry**

This is not a question from the book, the appendic table is not needed, it is just an example of resources you may have.

*February 8, 2012*

**Chemistry**

Your laboratory supervisor directs you to prepare 500.0 mL of a buffer with a pH of 9.40. You have available all the weak acids and bases listed in your textbook's appendix and the salts of those weak acids and bases. Describe how you could make this buffer.

*February 8, 2012*

**arithmetic**

the sum of the 3rd and the 4th term is 44 and the sum of the 10th and the 15th term is 203. what is the sum up to the 20th term?

*February 7, 2012*

**physics**

How does your mass on Earth compare to your mass on Mars?

*February 6, 2012*

**hinds**

A boat moves 20.6 km across a lake in 34 min. What was the average speed of the boat in kilometers per hour?

*February 5, 2012*

**math**

Its a multible choice question and the choices are 20,40,60,80 and I still don't see how to come up with any of these answers

*January 25, 2012*

**math**

still confused! do they want to know how many items were checked by BOTH john and calvin, meaning the same item?

*January 25, 2012*

**math**

John checks every 8th item for color, and Colin checks every 12th item for durability. If 1,920 items passed by both of them, how many items were checked by both John and colin? How do I figure this?

*January 25, 2012*

**math**

don't know where to start on this one! a box contains 56 marbles. If the probability of randomly selecting a blue marble is 3/8, how many blue marbles are in the box?

*January 24, 2012*

**math**

How do I solve this? A mixture of nuts has a ratio of 5 parts peanuts to 3 parts cashews. How many ounces of cashews are in a 24 oz mixture? I am thinking 9 oz., but how do you write a problem to solve this

*January 24, 2012*

**Algrebra**

find the value of r so the line that passesthough each pair of points has the given slope(9,r),(6,3),m=-1/3

*January 19, 2012*

**Math**

Illistrate that (x^1/2)(x^3/2) = x^2, using x=9

*January 18, 2012*

**Math**

Z^3/3?

*January 18, 2012*

**Math**

Divide. z4/5 divide by z1/2

*January 18, 2012*

**Math**

I mean x^2/3 / x^1/3

*January 18, 2012*

**Math**

Divide. x2/3 divided by x1/3

*January 18, 2012*

**Math**

Sorry, they are exponents! Fractions confuse me, would it be 2/1 + 1/3 and 2/1 + 1/4?

*January 18, 2012*

**Math**

Multiply. (a^2b^2)(a1/3b1/4)

*January 18, 2012*

**math**

Yes, 5/3 (fraction) after the y is an exponent.

*January 18, 2012*

**math**

Multiply. (x^5y5/3)^2

*January 18, 2012*

**Alg 2.. HELP?**

Multiply or divide. 14. (x^5y5/3)2 16. (a^2b^2)(a1/3b1/4) 18. x2/3 divided by x1/3 20. z4/5 divide by z1/2

*January 18, 2012*

**math**

Howard has 102 feet of fencing. What is the area of the largest square dog pen he can build with the fencing?

*January 18, 2012*

**Math**

a carpeting store is having a special sale, offering carpeting at $16.50 per square yard. Its competitor is offering carpeting at $1.90 per square foot. Which store is less expensive? By how much?

*January 18, 2012*

**English**

Can someone please help me with this, let me know if the below looks correct? Improving Your Writing. Section 1 Facts and Figures that define the problem (the cause) Details that show the impact of the problem (effects) on Jack, Ruth, and the company. Section 2 The steps ...

*January 18, 2012*

**math**

Takheela plans to ship a dollhouse in a box that is 30 inches along each edge. The dollhouse measures 24 inches wide, 20 inches long, and 28 inches high. How much foam packing material (in cubic inches) will she need? What is the approximate side length of the cubic box that ...

*January 18, 2012*

**math**

A city planner has placed a square wading pool in the center of a park. The pool is surrpunded by a square fence, 20 meters wide. The tiles for the floor of the wading pool cover 121 sqaure meters. How wide is the wooden deck sprrounding the wading pool?

*January 18, 2012*

**math**

A room has 750 cubic feet of space. If the room is as high as it is long and wide, what is the approximate height of the rooms ceiling?

*January 18, 2012*

**math**

A room has 750 cubic feet of space. If the room is as high as it is long and wide, what is the approximate height of the rooms ceiling?

*January 18, 2012*

**college mathematics1**

solve the system x+6y=24, -6x+5y= -21

*January 14, 2012*

**Math #2**

Sue's average for 9 games of bowling is 108. What is the lowest score she can receive for the tenth game to have an average of 110.

*January 9, 2012*

**Math**

Need to know the number possible of outcomes.If you spin a spinner with sections A,B,C,D ,and E and two coins are tossed

*January 9, 2012*

**physics**

A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·10^5 Pa. If there were no ventilation, by how much would the temperature (in K) of the air rise ...

*January 7, 2012*

**physics**

A water-cooled engine produces 1589 W of power. Water enters the engine block at 14.61 °C and exits at 29.91 °C. The rate of water flow is 147.3 L/h. What is the engine’s efficiency?

*January 7, 2012*

**algebra**

90+30(2)-4.9(2)^2=

*January 6, 2012*

**math**

Mindy, Daisy, Araceli and Leigh worked together on a job. The job paid $220. Each person was paid according to the amount of work they contributed to the job. Daisy and Araceli earned $280 together. Daisy and Mindy have $260, and Daisy and Leigh got $220. What percent of the ...

*January 3, 2012*

**chemistry**

Yes you`re good i made typo just to KMnos the right form is KMnO4 while CO3 is right please help if you know anything and thanks to much xxx

*January 3, 2012*

**chemistry**

14KMnos+4C3H5(OH)3----->7K2CO3+7Mn2O3+5CO3+16H2O I know this but hoe to do it please help me I have examination tomorow i i don't have idea how to do it:(:(:(

*January 3, 2012*

**asu**

calculus problem is u = 7i +9j + 2 k and v = -7i -9j - 2 k. and my ans is -135 how to double check

*December 31, 2011*

**pre-algebra**

find the product: (4k to the 5th power)(-2k)to the 3rd power. 5th power is inside the parenthesis and the 3rd is outside the parenthesis. Is it -32k to the 8th power or -32k to the 2nd power?

*December 18, 2011*

**algebra**

A flying saucer filled with space aliens landed in my front yard!After the entire crew had filled out of their spaceship, I happened to count their heads and feet. I saw a total of 91 heads and 124 feet. It was clear that their leader was a purple creature with three heads and...

*December 12, 2011*

**algebra**

I truthfully do not know this is a tricky one

*December 12, 2011*

**Math**

It is an easy answer you just have to use the order of operations

*December 12, 2011*

**economics**

I need help to put in Excel Sherwin -Williams exercise

*December 11, 2011*

**algebra**

How do you find the LCD for these fractions 3/4c & 5/6ct also is the LCD for 4/15 & 1/9 (45)?

*December 11, 2011*