Thursday

December 8, 2016
Total # Posts: 1,690

**Chemistry**

For every liter of sea water that evaporates, 3.70g of magnesium hydroxide are produced. How many liters of sea water must evaporate to produce 5.00 moles of magnesium hydroxide? Please show and explain all steps! Thank you!

*September 29, 2010*

**math**

Marcus want to make a stone walkway in his garden.the rectangular walkway will be 3 feet wide and 18 feet long.Each 2-foot by 3-foot stone covers an area of 6 sq. feet.How many stones will he need? is it 9?

*September 27, 2010*

**calculus**

Verify that the Intermediate Value theorem applies to the indicated interval and find the value of c guaranteed by the theorem. f(x) = x^2 - 6x + 8, [0,3], f(c) = 0 I have no idea how to use the theorem :(

*September 27, 2010*

**science**

What is the chemical name for Polyurethane and what does it look like at it's resting state?

*September 26, 2010*

**Avon k 8 Center**

If 50 is the first number, what is the second number?

*September 24, 2010*

**6th grade**

Next, Tom remembers that he heard a doctor talking about something that takes two weeks to heal. I have to identify what type of pronoun that (second one in sentence) is. Would it be a relative pronoun?

*September 22, 2010*

**Chemistry**

ammonia gas reacts with copper (ii) oxide at high temperatures to produce elemental nitrogen, copper metal, and water vapor. Assume that 36.2g ammonia reacts with 180.8 g copper ii oxide. (balanced equation: 2 NH4 (ammonium) (g) + 4 CuO (copper ii oxide) ==> N2 (nitrogen ...

*September 21, 2010*

**Chemistry**

Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!

*September 21, 2010*

**Chemistry**

Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!

*September 21, 2010*

**Chemistry**

61.0 mL of a 1.50 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 167 mL of water. What is the final concentration?

*September 19, 2010*

**calculus**

Fond the limit of lim x -> 3 [1/(x+4)] - (1/4) _________________ x

*September 19, 2010*

**Chemistry**

DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction: 2 C 6 H 5 Cl (Chlorobenzene) + C 2 H O Cl 3(chloral) ==> C 14 H 9 Cl 5 (DDT) + H 2 O In a government lab, 1142 g of chlorobenzene is reacted with 485g of Chloral. A)What mass of ...

*September 19, 2010*

**physics**

A hot air balloon has just lifted off and is rising at the constant rate of 1.8 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 11.2 m/s. If the passenger is 2.5 m ...

*September 16, 2010*

**physics**

An astronaut on Neptune drops a rock straight downward from a height of 0.95 m. If the acceleration of gravity on Neptune is 11.2 m/s2, what is the speed of the rock just before it lands? (m/s)

*September 16, 2010*

**Math**

State the Domain and show work. y = x + 2 / x^2 - 4x - 12

*September 16, 2010*

**MATH**

26=6(5-6A)

*September 16, 2010*

**calculus**

Find all possible radii of circle centered at (3,6) so that the circle intersects only one axis

*September 13, 2010*

**calculus**

Solve: sec(x)^2= 3tanx +1 *** It is suppose to be the sqaure root of 3 but i could find the symbol so just wrote the 3 without it but it is suppose to be the square root of 3 times tanx + 1

*September 13, 2010*

**math**

256 + 1,273

*September 13, 2010*

**PRE CALCULUS **

the question is actually square root of ( x+5) = x please ANSWER

*September 12, 2010*

**PRE CALCULUS **

How many real solutions does the equation ãx+5=x have? Please explain your answer to the best of your abilities thanks :)

*September 12, 2010*

**Pre CALCULUS**

How many real solutions does the equation x+5=x have? Please explain your answer to the best of your abilities thanks :)

*September 11, 2010*

**Pre Calculus**

As x increases from p/4 to 3p/2, the value of sin(x) : A.increases throughout the interval B.decreases at first, then increases C.increases at first, then decreases D.decreases throughout the interval E.none of the above please explain why the answer is as it is, I don't ...

*September 11, 2010*

**Calculus**

Solve for x: lnx^3 - 2lnx = 1 Please try and show how you got the answer best as you can thank you :)

*September 11, 2010*

**Calculus**

Solve : sec^2(x)= ã3*tanx + 1 on [0,radian-180 degrees) - couldn't find the symbol for radian on computer please try and explain how you got your answer best as yu can thanks so much :)

*September 11, 2010*

**Calculus**

The normal body temperature in humans ranges from 97.6 degrees fahrenheit to 99.6 degrees fahrenheit. Concert this temperature range into degrees celcius

*September 11, 2010*

**Calculus**

The celcius scale is devised so that 0 degrees celcius is the freezing point of water ( at 1 atmosphere of pressure) and 100 degrees celcius is the boiling point of water ( at 1 atmosphere of pressure) . If you are more familiar with the Fahrenheit scale, then you know that ...

*September 11, 2010*

**Chemistry**

A single 4p orbital can hold how many electrons? i got 6 is that correct or no? Would conducting electricity be considered a physical or a chemical property of ZINC?

*September 10, 2010*

**rounding**

(a) 455 cal to joules thats 1 903.72 joules but i need to round it to 3 sig figs how do u do that?

*September 9, 2010*

**9th grade**

we know that sum means adding. So which one of your choices deals with adding?

*September 9, 2010*

**plz help me for math**

you always want to start by putting like terms together. So why don't you do that first and then its really easy from there all you have to do is follow the signs(- or +) and add or subtract

*September 9, 2010*

**chemistry**

Would Conducting electricity be considered a physical or chemical property of zinc i got physical but just want to make sure.

*September 9, 2010*

**Chem**

Would conducting electricity be considered a physical or chemical property of ZINC i got phyiscal but just want to make sure.

*September 9, 2010*

**chemistry**

A single 4p orbital can hold how many electrons? i got 6 is that correct or no?

*September 9, 2010*

**Pre Calculus**

Determine the coordinates of the point (xy) where the curves y=(12)x−5 and y=x2+2x−15 intersect in the third quadrant

*September 8, 2010*

**Pre Calculus**

The strength of a cable is proportional to the square of its diameter. If a 2-cm cable will support 800kg, how much will a 3-cm cable support?

*September 8, 2010*

**chemistry**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...

*September 6, 2010*

**chemistry**

Which of the following properties is a chemical property of phosphorus? Answer a) it burns in air b) it is a white waxy solid c) it melts to form a viscous liquid at 44.1 oC d) Both a and c are both examples of chemical properties. e) a, b, and c are examples of chemical ...

*September 6, 2010*

**chemistry**

Convert a density of 2.74 x 103 g/L into a density with dimensions of kg/mL. please show how would this conversion be done.??

*September 6, 2010*

**physics**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...

*September 6, 2010*

**Mayans and aztecs**

how did the aztecs acquire most new pieces of land

*September 6, 2010*

**Chemistry**

Are significant figures relevant in temperature? ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as -272.78 *C? or -273 *C because of significant figures?

*August 31, 2010*

**Chemistry**

Are significant figures relevant in temperature? ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as -272.78 *C? or -273 *C because of significant figures?

*August 31, 2010*

**math**

find the range of the function. g(x) = 5 + (square root of) (4 - x) please show all steps.

*August 28, 2010*

**Math**

Solve the following equation. 4.7 = 1.13x^2 Do i square root the 1.13x^2 first? or divide both sides by 1.13?

*August 28, 2010*

**5th grade math**

what is 2 to the first and second power? component problem

*August 26, 2010*

**math**

It took a faster runner 10 sec. longer to run a distance of 1500 m than it took a slower runner to run a distance of 1000 m.If the rate of the faster runner was 5 m/sec more than the rate of the slower runner,what was rate of each?

*August 23, 2010*

**math**

which has greater volume? a) 1.0 kg of feathers or 1.0 kg of lead b) 100 g of gold or 100 g of water c) 1.0 L of copper or 1.0 L or mercury

*August 23, 2010*

**math**

write 480 in a) 1 significant figure b) 2 significant figures c) 3 significant figures d) 4 significant figures

*August 23, 2010*

**math**

what is the role of derrivatives in the subjects other than mathematics.

*August 21, 2010*

**5th grade English**

However, misfortune and trouble did not stop Ray Charles. Subject=misfortune, trouble Verb= did stop

*August 20, 2010*

**Math**

A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F denote the event that the sum of the numbers landing uppermost is 6. Determine whether E and F are independent events

*August 15, 2010*

**math**

corp provides issuance of 200,000 shares of common stock. 40,000 shares were originally issued and 500 were reacquired. What is the number of shares outstanding?

*August 9, 2010*

**math**

corp provides issuance of 200,000 shares of common stock. 40,000 shares were originally issued and 500 were reacquired. What is the number of shares outstanding?

*August 9, 2010*

**physics**

"A one meter board with uniform density, hangs in static equilibrium from a rope with tension T. A weight hangs from the left end of the board 0.2m away in distance. What is the mass of the board"

*July 30, 2010*

**MATH**

1/2, 3/4, 3/8

*July 20, 2010*

**MATH**

FIND THE L.C.D. OF EACH AND EXPRESS THE FRACTIONS OF EACH IN TERMS OF THE L.C.D.

*July 20, 2010*

**Chemistry**

107.8?????

*July 19, 2010*

**algebra**

solve by multiplication -7/8x = -9/10

*July 8, 2010*

**math**

the equation is actually 2t^3-4t^2+3

*June 21, 2010*

**math**

Consider the function defined below. y = 2t3 - 4t2 + 3 (a) Calculate the second derivative. y '' = (b) Calculate the third derivative. y ''' =

*June 21, 2010*

**math**

which one is part a and part b.

*June 21, 2010*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 61 male firefighters are ...

*June 20, 2010*

**Statistics**

Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches? 34.1% 84.0% 15.7% my answer was 13.6 13.6% is this correct 97.6%

*June 20, 2010*

**Statistics**

x=3-0 . What percentage of the area under the normal curve lies to the left of ( 16.0% 15.80% 2.50% 0.50% having trouble with this my answer was 15.00% 0.15%

*June 20, 2010*

**physics**

A ball is launched from ground level at 31.8 m/s at an angle of 35° above the horizontal. How far does it go before it is at ground level again? A) 14 m B) 21 m C) 43 m D) 86 m E) 97 m

*June 10, 2010*

**physics**

A ball is rolled horizontally off a table with an initial speed of 4.0 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.34 s. What is the height of the table? (g = 9.8 m/s2 and air resistance is negligible)

*June 10, 2010*

**algebra**

okay I understand thanks!

*June 8, 2010*

**algebra**

Ms. Sue how did you get -8? is this the common number?

*June 8, 2010*

**algebra**

first you would need to find the value of x I divided -720 by 9 and got -80 however this is not correct so I tried -90 and it proved to be true. So x = -90 I also would like to know what a simpler way of solving this problem would be?

*June 8, 2010*

**Algebra**

What similarities and differences are there between functions and linear equations?

*June 8, 2010*

**Math**

1. You would need to multiply the total check by 15%. 2. Assuming your commission rate is that of the clients payment... you would do the same as the first question... multiply.

*June 8, 2010*

**math**

32 times

*June 7, 2010*

**chemistry**

What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide? 2H2O2 (l) ==> 2H2O (l) + O2(g)

*May 23, 2010*

**Chemistry**

What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide? 2H2O2 (l) ==> 2H2O (l) + O2(g)

*May 23, 2010*

**physics**

An elevator cab in the New York Marriott Marquis has a mass of 4.96 x 103 kg and can carry a maximum load of 1.80 x 103 kg. If the cab is moving upward at full load at 3.71 m/s, what power is required of the force moving the cab to maintain that speed?

*May 21, 2010*

**physics**

A 0.077-kg arrow is fired horizontally. The bowstring exerts an average force of 50 N on the arrow over a distance of 0.75 m. With what speed does the arrow leave the bow?

*May 21, 2010*

**Chemistry**

Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this? Are these steps right? 32.0g x 55*C = 1760 calories = 420.65 Joules

*May 19, 2010*

**Chemistry**

Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this?

*May 19, 2010*

**Chemistry**

What Rght said

*May 19, 2010*

**Chemistry**

Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this?

*May 19, 2010*

**computers**

Microsoft Excel (full name Microsoft Office Excel) is a spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. It features calculation, graphing tools, pivot tables and a macro programming language called VBA (Visual Basic for ...

*May 18, 2010*

**Chemistry**

But that's just .100 over .100 for the base over acid isn't it? then it would just be 6.4 X 10-5 because the log of 1 is 0?

*May 5, 2010*

**Trig**

The answer is -128+128i

*May 4, 2010*

**algebra**

the sum of

*May 3, 2010*

**Chemistry**

Which of the following compounds will melt ice at the lowest temperature? Sucrose, sodium chloride, or magnesium chloride?

*May 2, 2010*

**Chemistry**

Answer the following question about copper (II) sulfate pentahydrate: a)how much water (in g) is there in 10.0 g of the compound listed above? b)If you needed 2.50g of CuSO4 for a reaction but only had CuSO4 * 5H2O available, how many g would you need to use to get the same ...

*May 2, 2010*

**Chemistry**

A)250 g of LiBr is dissolved in 200g of water 100 degrees C. The solution is then cooled to 20 degrees C. How much precipitate (if any) is formed? B) 42 g of KCl is dissolved in 100g of water at 50 degrees C. The solution is then cooled to 20 degrees C. How much precipitate (...

*May 2, 2010*

**Global History**

What were the differing politucal and economic systems between the US and Soviet Union that helped lead to the Cold War? I know that the political difference was that the US was democratic and the Soviet Union were communists. However, if the US economic system was ...

*May 1, 2010*

**chemistry**

What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O Are these the right steps? 1.40mol Na2SO4 / 1.75kg = .8m 3 * 1.86 degrees C * .8m = 4.46 degrees C 4.46 degrees C - 1.86 degrees C = 2.6 degrees C

*April 29, 2010*

**Chemistry**

Determine the freezing points of each 0.20m aqueous solution. a)K2SO4 b)CsNO3 c)Al(NO3)3

*April 29, 2010*

**Chemistry**

What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O b)0.060 mol MgSO4 in 100g H2O

*April 29, 2010*

**math algebra with pizzazz**

pg 142 What happened to the computer programer

*April 28, 2010*

**Chemistry**

How many grams of K2SO4 would you need to prepare 1500 g of 5.0% K2SO4 (m/m) solution?

*April 26, 2010*

**Kindergarten Math**

A counter is a small plastic circle about a half-inch in diamiter

*April 19, 2010*

**grade 10 career studies**

I have to hand in an assignment called WHO AM I? for my grade 10 career studies course, i just need to no what to hand in exactly

*April 16, 2010*

**Osciallations**

A harmonic oscillator has mass 0.530km and an ideal spring with force constant 146N/m . Find the period, frequency, and angular frequency.

*April 15, 2010*

**Trig**

oh it's tan(x/2) = a ........... use the fact that x = 2 . x/2

*April 13, 2010*

**Trig**

Given that tan(pi/2) = a. Express tan(x) and sin(x) in terms of a. Hint: Use the fact that x = 2.(pi/2)

*April 13, 2010*

**Chemistry**

Which of the following substances dissolve to a significant extent in water? Explain your answer in terms of polarity. a) CH4 b) KCL c)He d)MgSO4 e)sucrose f)NaHCO3

*April 13, 2010*