# Posts by joshua

Total # Posts: 679

**chemistry**

Hi Anonymous, Truthfully speaking I don't know much about ozone cracking. However, seeing that no one has answered your query for almost two hours, I will try to help. The definition of ozone cracking as stated in Britannica Encyclopedia is as such: "Atmospheric ozone...

*October 16, 2008*

**chemistry**

Hi Lili, I'll try this one. You could add silver carbonate to the solution. A white precipitate is produced, while a colorless, odorless, gas is evolved which produces a white precipitate in limewater (calcium hydroxide). Hope I helped! :)

*October 16, 2008*

**Wellness, puberty**

might not*, spelling error.

*October 15, 2008*

**Wellness, puberty**

Hi Max, well, in short, we need the knowledge for adulthood after marrying etc. Also, this knowledge is classified as general knowledge, some might need it, some might now :) Though most do, like how many people are reliant on common knowledge

*October 15, 2008*

**math-3rd grade**

together with 1100 + 1600, 1100 - 500, and I'm not sure if you also want to include those with negative answers..

*October 15, 2008*

**math-3rd grade**

Oops, missed out some equations such as 500 + 1600, sorry about that

*October 15, 2008*

**math-3rd grade**

Hi elaine, Yup, that is all correct. Well done!

*October 15, 2008*

**Math**

Hi Tina, A palindromic number is a symmetrical form, in this case, xyx, where x has to be 2 as the number is between 200 and 300. We'll ignore the y to move on to finding the x. Create two numbers where the difference of the hundreds place = 2. For example, 9y9 and 7y7. Or...

*October 15, 2008*

**calculus**

Hi Meghan, If you differentiate a constant (i.e. any number, fraction or yeah...a constant), you always get 0. Hope I helped :)

*October 14, 2008*

**Math**

You're welcome ^^ :)

*October 14, 2008*

**Math**

Okay, we'll do it by completing the square. :) From 3x^2 + 4x = 224, x^2 + 4/3 x = 224/3 x^2 + 4/3x + 4/9 = 224/3 + 4/9 (x+2/3)^2 = 75/1/9 x + 2/3 = square root of 75/1/9 x + 2/3 = 8/2/3 or -8/2/3 x = 8 or -9/1/3( Not applicable as positive integer cannot be a negative ...

*October 14, 2008*

**Math**

Your formula is correct. Assuming you add up the 3x and x to form 4x, you have to use the general solution of a quadratic equation. Do you know how to use it? =) By the way, x should be 8 if you use it right.

*October 14, 2008*

**Mathematics**

Thanks for the help =) Clear and detailed explanation.

*October 14, 2008*

**Mathematics**

Hi there, Can someone help me with the question: "Prove that the value of 7sinx +3cos2x cannot be greater than 5/1/24 for all values of x between 0 degrees and 360 degrees" Thanks lots. =) I've already simplified 7sinx + 3cos2x into (2sinx-3)(3sinx+1).

*October 14, 2008*

**5th grade math**

i am a number less than 10.my hundreds digit is 3 more than my thousands digit,my tenths is 2 less than my hundreds and my ones is the sum of my tenths and hundreds digits.what number can i?

*October 10, 2008*

**rounding decimals**

whay is the difference between rounding decimals to the greatest to the nearest whole

*September 7, 2008*

**ecology**

WHICH WEATHER SITUATION WILL BE THE LEAST COMFORTABLE FOR A LONG DISTANCE RUNNER? A.20* CELCIUS (68f) WITH RELATIVE HUMIDITY OF 40% B. 20* CELCIUS (68f) WITH RELATIVE HUMIDITY OF 90% C.25* CELCIUS (77 f) WITH RELATIVE HUMIDITY OF 90% D.35* CELCIUS (95 f) WITH RELATIVE HUMIDITY...

*September 6, 2008*

**biology**

what is the the equation for photosynthesis?

*August 4, 2008*

**Math**

Differentiate population from sample

*June 12, 2008*

**geometry**

what are the problems?

*May 31, 2008*

**geometry**

What are if then statments .Ill need examples please .its for a project .

*May 28, 2008*

**HELP WITH MATH**

Sorry the caps lock was on. Can you help me with this pre calculus question. I'm not quite sure how to do this. Here are the instructions. Find the area between each curve and the x-axis for the given interval: y=2x^2+x+1 from x=3 to x=6

*May 14, 2008*

**chemistry**

Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

*May 7, 2008*

**Psychology-Opinions wanted**

i love psychology

*May 1, 2008*

**physics**

What is the wavelength of a proton traveling at a speed of 6.87 km/s

*April 22, 2008*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4

*April 21, 2008*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4

*April 20, 2008*

**trig**

y = 3cos(x-1) Shift along x: Shift along y: Kind of reflection:

*April 20, 2008*

**us history**

Thanks, much appreciated, very nice of you to look.

*March 12, 2008*

**us history**

Is there any way someone can provide me with either a synopsis, or a link to a synopsis to the lincoln steffens book The struggle for self-government? Thanks

*March 12, 2008*

**math**

s^2 - s - 6 What you're looking for is a number that when you multiply it, it equals -6 and when you add them it equals -1. these values -6 and -1 are derived from the equation. so number could be --> -/+ 3, -/+ 2 but since there's only one way of getting -1 when ...

*March 7, 2008*

**Math**

( 2 3/4 miles ) / ( X feet) = ( 1 mile)/ ( 5280 feet ) then cross multiply (2 3/4 mi)*(5280 feet)= (x feet)(1 mi) (2 3/4 )(5280) = x feet that equals your total feet for 2 3/4 miles.

*March 5, 2008*

**math**

7,2 ---> 2,7 5,4 ----> 4,5 1,8 ----->8,1 9,0 -----> can't be reversed because it doesn't become a two digit number. 3,6 ----->6,3 ----------------------------------- all these two digit numbers add up to 9, and if reversed, you should subtract 72- 27= ...

*March 5, 2008*

**chemistry**

Match the correct mole ratio to the substances in the reactions below. carbon monoxide to iron in the reaction: Fe2O3 + CO ==> Fe + CO2 water to manganeese(II) chloride in the reaction: HCl + MnO2 ==> H2O + MnCl2 + Cl2 sodium to oxygen in the reaction: Na + O2 ==> ...

*February 29, 2008*

**geography**

how do i find countries with rank classes?

*February 28, 2008*

**chemistry**

When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn, for the reaction ...

*February 24, 2008*

**math**

2. since you want to know for 20 days, how much gas you waste, 20*( 1 1/2) = 30 So , you waste 30 gallons of gas in 20 days, How much money do you spend on 30 gallons of gas. 30*($2)= $60 for 30 gallons of gas which covers 20 workdays)

*February 23, 2008*

**math**

1. its a basic subtraction question. (3/4)-(1/2)=1/4 you subtract because he sold it.

*February 23, 2008*

**math**

(3/4)^(-1). Just switch the fraction to 4/3 , because its the whole fraction raised to -1. if ( 3^(-1) ) / 4 ==> 1/(3*4)=1/12

*February 23, 2008*

**math**

-7^ (-2), put it divided by 1. -1/(7^2) when you place the exponent to the denominator, change the sign, same goes if you have a negative exponent on the denominator, bring it to the numerator and change the sign. -1/49

*February 23, 2008*

**algebra**

(m+5/6)= -19 (m+5/6) *6 = -19 *6 (m+5) -5= -114 -5 m= -119

*February 17, 2008*

**pre- algebra**

(5t-9/ 4 ) = 14 5t-9 =14*4 multiply 4 to both sides, and it cancels the 4 on the left side. 5t-9=56 add 9 to both sides, and it cancels on the left side. 5t=56+9 5t=65 divide by 5 on both sides t= 13

*February 17, 2008*

**pre- algebra**

Do have trouble finding t?

*February 17, 2008*

**pre- algebra**

30= new racket 30= 3x-6, where x=old racket so x=12, old racket cost 12 dollars

*February 17, 2008*

**criminology**

what are the three major kinds of crime statistics used by criminologists? What are the advantages and disadvantages of each measure of crime? What kinds of questions about crime does each measure address most usefully?

*January 16, 2008*

**Math adding fractions**

i need help!

*November 30, 2007*

**Japanese - translate & construct sentences**

Wow! Thank you so much^^

*November 3, 2007*

**Japanese - translate & construct sentences**

I need help translating the following into japanese. -Clan of the Shadow. -Village of the Shadow. -Hidden Village of the Shadow. -Country of the Shadow. -Land of the Shadow. -Second Royal Family of the Village of the Shadow This is what I have so far: #Shadow: kumori, kage, ...

*November 3, 2007*

**Japanese (extramural: linguistics/culture/history)**

|SraJMcGin| No problem!^^ Thank you very much for those links! Very interesting sources.

*November 3, 2007*

**Japanese (extramural: linguistics/culture/history)**

|Anonymous| Oh, you're right. Thanks mate! Good luck to you too. |drwls| My apologies^^ ... but the statement is meant to be taken in a personal sense (nothing foreign for me) ... Impressed that you feel so strongly about me homeland^^ Japan, very very interesting indeed...

*November 3, 2007*

**Japanese (extramural: linguistics/culture/history)**

...sorry for any of the grammatical errors... kinda in a hurry today^^

*November 3, 2007*

**Japanese (extramural: linguistics/culture/history)**

Hallo, my name is Joshua. I'm currently doing my matric in south africa, which is most unfortunate, because south africa doesn't have much to offer in terms of "foreign languages/culture." (Moving to england in a month. Perhaps it has more to offer^^) I am ...

*November 3, 2007*

**Algerbra**

w=42.5

*October 23, 2007*

**Askk**

What is the worlds tallest man

*October 21, 2007*

**History**

Was pope gregory justified in excommunicating Henry? explain?

*October 20, 2007*

**History**

What is excommunication? what role did it play in the struggle between popes and kings?

*October 20, 2007*

**History**

How does the hierachy of the catholic church compare to the hierachy of feudal society in western europe?

*October 20, 2007*

**History**

What aspects of european society did the church dominate from 1100 to 1300?

*October 20, 2007*

**Biology**

-6.86 bars

*October 11, 2007*

**Physics 221**

1. throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be: A. positive and negative, respectively B. negative and positive, respectively C. negativa and negative, respectively D. negative and ...

*August 26, 2007*

**Physics 221**

An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4m/s^2. Its average velocity as it goes from x=2m to x=8m is: A. 1m/s B. 2m/s C. 3m/s D. 5m/s E. 6m/s An object is released from rest and falls a distance H during the first ...

*August 26, 2007*

**Algebra**

How do you calculate the area of a rectangle. area of a rectangle is length x width.

*August 19, 2007*

**Math**

On a grid with points R(-2,-6)& S(3,4), what is the slope of line RS? I don't know how to find the slope. Thank you. The formula for a straight line is y = mx + b m is the slope and b is the y intercept. One way is to plug in the two sets of points listed in the problem ...

*June 26, 2007*

**Computer Science**

Describe Operating systems theory and configuration at the Unix kernel/Windows registry level Describe standard operating system services (RPC, NetBIOS, etc) Describe File storage, management, and security shemes Describe command line administration of UNIX/Windows Describe ...

*June 19, 2007*

**Ancient Civilization**

What is a mixture of sand, lime and water and used as lubricant to move stones in ancient egyptian civilization? Slurry is a nice word.

*May 22, 2007*

**ancient civilization**

what is a mummy shaped amulet that held farm tools.....it starts with the letter S? Thank you for using the Jiskha Homework Help Forum. It's interesting to note that this was a crossword puzzle word! Here's the answer: These statuettes would be placed in a tomb along ...

*May 22, 2007*

**Ancient civilization**

What is a translucent stone used in floor slabs in ancient egyptian civilization? If you'll go to http://www.google.com and enter translucent stone egyptian, you'll find the answer. =) http://touregypt.net/magazine/mag06012001/magf5.htm

*May 22, 2007*

**5th Grade Math**

I need help on how to use an equation to graph? Here is an example from the text book. y=x-4 example shows x= -2 -1 1 2 y= -6 -5 -3 -2 I want know how did they show this relationship.

*April 23, 2007*

**math**

ok, but what happened to the letters? don't they remain part of the problem? also, how does 15k/20k reduce to 4/5? thanks for your help. joshua 15k/20k should reduce to 3/4 because you can take a 5 out of 15 and be left with 3 and take 5 out of 20 and be left with 4. The ...

*March 4, 2007*

**where did bob go?**

can anyone simplify and multiply the rational expressions 10m/11p x 44p/20k x 15k/8m? and then explain it to me? have patience.

*March 4, 2007*

**math**

10m/11p.44p/20k.15k/8m we are multiplying and dividing rational expressions. can ne1 help? I have no idea what you need. Your first line makes no sense. i know, it doesn't make any sense to me either...it's fractions 10m/11p times 44p/20k times 15k/8m. we have to ...

*March 4, 2007*

**Religion**

In the Christian religion,why were ashes originally sprinkled on the top of people's heads on Ash Wednesday instead of on the forehead? This site gives the history of the use of ashes on Ash Wednesday. http://www.wf-f.org/AshWed.html#anchor2360581 http://www....

*February 24, 2007*

**chemistry**

which atom has a higher potential energy? neon or flourine

*November 19, 2006*

**calculus**

Constant annual percentage growth The function gives the value of a home in dollars in the year 2000 + t. Find the constant annual percentage change in the value of the home. Give appropriate units with your answer. Again, I'm not sure what function is being referred to ...

*September 5, 2006*

**calculus**

writing an exponential equation The function gives the value of a home in dollars in the year 1980 + t. Write an equation that can be used to determine the year in which the value of the home reached $100,000? Use ^ to denote an exponent. Do not solve the equation and do not ...

*September 5, 2006*

**calculus**

Evaluating an exponential function The function gives the value of a home in dollars in the year 1980 + t. What was the value of the home in 1988? Round your answer to the nearest whole dollar amount and give units. You would evaluate for t=8. The units should be dollars. Your...

*September 5, 2006*

**calculus**

Consider the exponential function . Which of the following best describes the the graph of g? a. Concave up and increasing b. Concave up and decreasing c. Concave down and increasing d. Concave down and decreasing The rules are +constant, concave up, - constant concave down. ...

*September 5, 2006*

**Calculus**

Determine the y-intercept of the exponential function y=6.05(0.83)x. Write your answer as an ordered pair enclosed in parentheses. What is y when x=0? The ordered pair looks like (x,6.05(0.83)x). Evaluate this for x=0. BTW, where is the exponential sign ^ ? Do you mean 6.05(....

*September 5, 2006*

**government**

what does nra meen

*August 8, 2006*