Tuesday

February 21, 2017
Total # Posts: 113

**Chemistry**

The number of moles of cl2 produce will be ??????? If one mole of pcl5 is heated at 250 in a vessel having a capacity of 10dm³.

*October 19, 2016*

**statistics**

A company assembles drills using components from two sources. Acemart supplies 91% of the components and Begud supplies the rest. It is known that 6% of the components supplied by Acemart are faulty and 3% of those supplied by Begud are faulty. a) represent this info on a tree...

*December 3, 2011*

**statistics**

For any married couple who are members of a squash club, the probability that the husband has a degree is 2/4 and the probability that the wife has a degree is 1/4. The probability that the husband has a degree given that his wife has a degree is 3/9. A married couple is ...

*December 3, 2011*

**statistics**

A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen is denoted by the random variable X. Show that a)P(X=0)=120/2730 b)P(X=2)=1296/2730

*December 3, 2011*

**math**

sorry im really confused, which part of the questions is this answering? can i tell you my answers and you say if they're correct. a) y=x squared -3x to the power -1 - 1/2 b)i did this :) c) 13x-4y+6=0

*December 3, 2011*

**math**

The curve C with equation y=fx passes through the point (3, 14/2) given that f'(x)=2x+3/xsquared a) find f(x) (5 marks) b) verify that f(-2)=5 (1 mark) c) find an equation for the tangent to C at the point (-2,5) giving your answer in the form ax+by+c=0

*December 3, 2011*

**maths**

The curve C with equation y=fx passes through the point (3, 14/2) given that f'(x)=2x+3/xsquared a) find f(x) (5 marks) b) verify that f(-2)=5 (1 mark) c) find an equation for the tangent to C at the point (-2,5) giving your answer in the form ax+by+c=0

*December 3, 2011*

**maths**

how do i work out 7.25/0.25 without using a calculator???

*November 15, 2011*

**math**

but how would i answer it anyway ?/

*November 13, 2011*

**math**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 13, 2011*

**maths**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 13, 2011*

**maths**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 12, 2011*

**maths**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 12, 2011*

**maths**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 12, 2011*

**Maths**

This is actually maths homework but the question sounds like geography: 1)Why do you think the UK is so high up in the list for mortality rates due to drug-related diseases. What do you think we can do to lower drug-related deaths in the UK? 2)Why do you think the UK is so ...

*November 12, 2011*

**maths**

solve the simultaneous equations: y=x-2 ysquared+xsquared=10

*November 3, 2011*

**maths**

How is root245 7root5, how do you work it out? isnt 5*43 245 and you cant simplify that further?

*October 23, 2011*

**maths**

rationalise 5+2square root 5 divided by square root 5. please can someone help me on how to get the answer 2+square root 5

*September 9, 2010*

**maths**

a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. Exluding the sliced piece, the angle is 320 degrees. a) Calculate the area on top of the slice that has been ...

*April 25, 2010*

**maths**

thankyou, I wanted to know whether I was right or the textbook because it was very rare that they make mistakes, I wanted to clarify whether it makes sense to add the 2 sides area=240. I thought it did so Im going to leave it how I did it.

*April 23, 2010*

**maths**

a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. Exluding the sliced piece, the angle is 320 degrees. a) Calculate the area on top of the slice that has been cut...

*April 23, 2010*

**FOR NABIAH**

that is by using sections and work out the area of the 3 parts: 1)rectangle * 2(shown by the slice being cut), 2)long rectangle around cake (stops when you get to slice) and finally 3)the top and bottom of the cake ( angle is 320) how do I work out the area of 2) and 3) so ...

*April 22, 2010*

**FOR NABIAH**

ok, but what about question c) what formulas would I use, is my method correct?

*April 22, 2010*

**maths**

no its leaving 40 degrees of the cake left, 320 is wot is there

*April 22, 2010*

**maths**

not tops and bottoms, i mean like you have to work out the area of the top of the cake using the sector 320 degrees, but there is also a bottom so you therefore have to multiple it by 2. same with when you cut the slice- there are 2 rectangular sides. obviously round the ...

*April 22, 2010*

**maths**

why is it a 60 degrees central angle? arent you supposed to break the cylindrical cake into parts: top and bottom, 2 rectangles where the slice has been cut inside, outside curved when opened out becomes long rectangle?? then work out the area of each part then add up. i want ...

*April 22, 2010*

**maths**

i know its listed as anonomous above but its me really so ive given you basically my how i worked out a and b including the vital answers.

*April 22, 2010*

**maths**

a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. a) Calculate the area on top of the slice that has been cut out. b) Calculate the volume of the cake that ...

*April 22, 2010*

**maths**

sector angle is 320 degrees without sliced cut which is therefore 40 degrees

*April 22, 2010*

**maths**

a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. a) Calculate the area on top of the slice that has been cut out. b) Calculate the volume of the cake that ...

*April 22, 2010*

**maths**

this is me nabiha named anonymous

*April 22, 2010*

**maths**

a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. a) Calculate the area on top of the slice that has been cut out. b) Calculate the volume of the cake that ...

*April 22, 2010*

**maths**

The probability that Richard beats John at badminto is 0.7. The probability that Richard beats John at sqaush is 0.6. These events are independant. Calculate the probabilty that, in a week when they play one game of badminton and sqaush: a) Richard wins both games b) Richard ...

*April 22, 2010*

**maths**

solve h(x+5) = 80 as a quadratic

*April 20, 2010*

**maths**

solve h(x+5) = 80 as a quadratic

*April 20, 2010*

**maths**

but how do u solve h(x+5)=80 i have never come across ones like these.

*April 20, 2010*

**maths**

The width of a rectangular photograph is 5cm more than the height. The area is 80cm squared. Find the height of the photograph.

*April 20, 2010*

**maths**

The width of a rectangular photograph is 5cm more than the height. The area is 80cm squared. Find the height of the photograph.

*April 20, 2010*

**maths**

solve: y=x-1, y=x squared+2x-7

*March 18, 2010*

**biology**

Suggest how the active transport of glucose out of the cell and into the bloodstream helps with the absorption of glucose from the small intestine. (2 marks)

*March 16, 2010*

**maths**

solve the following simultaneous linear equation: -5x+6y=44 9x+7y=-8

*March 15, 2010*

**maths**

Solve the following simultaneous equation: 8x+3y=23 6x+5y=9

*March 15, 2010*

**7th grade science**

the diaphram relaxes when you inhale providing a large volume in the thorax, the diaphram contacts when you exhale so a smaller volume

*March 15, 2010*

**chemistry**

What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is ...

*November 8, 2009*

**english**

i need a really quick summary of chapter 2 in lord of the flies.

*November 8, 2009*

**chemistry**

What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is ...

*November 8, 2009*

**chemistry**

yes i think this is correct.

*November 8, 2009*

**chemistry**

What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is ...

*November 8, 2009*

**chemistry**

sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is produced instead of the metal at the positive electrode.

*November 8, 2009*

**chemistry**

What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is ...

*November 8, 2009*

**chem**

. Give two reasons why graphite (carbon) electrodes are used in electrolysis. 5. You have 2 compounds called X and Y. X melts at 1200 degrees C and is soluble in water. Y melts at 156 degrees C and is insoluble in water. Draw 2 diagrams to show how you could prove which of ...

*November 2, 2009*

**chemistry**

4. Give two reasons why graphite (carbon) electrodes are used in electrolysis. 5. You have 2 compounds called X and Y. X melts at 1200 degrees C and is soluble in water. Y melts at 156 degrees C and is insoluble in water. Draw 2 diagrams to show how you could prove which of ...

*November 2, 2009*

**physics**

A bike racer is riding his new bike at Silverstone. The track is 4km long. a) What is his average speed in m/s if he does a lap in 2 minutes? b) What is his velocity after one lap?

*September 11, 2009*

**Physics**

A bike racer is riding his new bike at Silverstone. The track is 4km long. a) What is his average speed in m/s if he does a lap in 2 minutes? b) What is his velocity after one lap?

*September 11, 2009*

**math**

make v the subject of the formulae: V=2v+3u

*June 21, 2009*

**maths**

i meant V=2v+3u make the small v the subject of the formulae

*June 20, 2009*

**maths**

make the letter in the bracket the subject of the formulae: v=u-3t (t) a=b-4c (c)

*June 20, 2009*

**chemistry**

what exactly would you observe and see at the end of the reaction of zinc and lead nitrate? include in formation about colour changes and bubbles. you can use the following equation to help; zinc+lead nitrate(arrow) zinc nitrate+lead

*June 20, 2009*

**chemistry**

does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the water and there are lead ...

*June 20, 2009*

**chemistry**

why does zinc and lead nitrate react?

*June 20, 2009*

**chemistry**

are there any notes about colour changes or note of any bubbles?

*June 20, 2009*

**chemistry**

what do you observe in the displacement reaction of zinc and lead nitrate? also, what is the symbol equation for this reaction?

*June 20, 2009*

**French**

ok, thankyou for the help.... i tried but i couldn't get what they meant, i was just making sure

*April 23, 2009*

**French**

What do these mean in English? Tu habites dans le centre-ville? Qu'est-ce qu'il y a dans ton village? Qu'est-ce qu'on peut faire a Manchester? Qu'est-ce tu fais a Manchester? Est-ce que tu aimes habiter a Manchester?

*April 23, 2009*

**English**

aparantly this poem is by an author and I just want to know who this author is aswell.

*April 20, 2009*

**English**

I have to build a poem using all of these words exactly and this is really hard. I need help so badly. a a a a all alone and and and and and and and and and and arise arise bean-rows bee-loud build by cabin clay comes core cricket day deep dropping dropping evening for for for...

*April 20, 2009*

**Music**

does anyone know the notes for the whole of the song ' Hallelujah' or 'my heart will go on' I have to perform them on the recorder- can i have the letters please because I can't read music.

*March 27, 2009*

**French**

There's lots of entertainment: Il y a beaucoup de distractions You can go out: On peut sortir It's very lively: C'est tres anime Everybody is in a hurry: Tout le monde est presse. Is this correct from english to french??

*March 24, 2009*

**RE**

How do human beings cause suffering in 'Today's world'

*March 24, 2009*

**8th grade**

Paumonauk

*March 23, 2009*

**music**

upcoming shows probably because that is the most recent. but i still need to include history so I need both sources of information to combine.

*March 23, 2009*

**music**

i have to do a project about 'west end musicals' can anyone suggest how i structure his and what i should include because I don't know what to include. shall i include a page about a popular musical and so on or not? can anyone find any useful sites which I can ...

*March 23, 2009*

**7th grade**

This is because the Himalaya Mountains are a result of continent-continent collision and vulcanism in destructive boundaries results from subduction of oceanic plates. As the Indo-australian plate continues to collide with the Eurasian plate, subduction is no longer possible. ...

*March 23, 2009*

**chemistry**

Metals + cold water. Li, Na, K, Ca. Notes on reactions, equations or space? <<<< don't no what space or equations means. can someone help? Also, say order of reactivity.

*March 14, 2009*

**History**

i mean is it good enough in the actual information and not typos or verbs. Do I need to add anythin to the actual content. I can adjust the other things wen i write up the real version. Is there any other reasons because it seems too short.

*March 14, 2009*

**History**

Why did slavery last so long? Is my answer good enough 4 ten marks? What else do I need to add? Slavery lasted for so long for many reasons. Source A, C and E tells me about the harsh conditions slaves lived in. After the 1440's lavery became a way of life from which there...

*March 14, 2009*

**history**

Source F: If abolotion shall take place, our interest in the West-India islands must be at an end,Seventy millions of property will wear away with time, and be sunk at last. The revenue will suffer an annual reduction of three millions at least; the price of sugar, which is ...

*March 11, 2009*

**English**

An essay on the following question: How is Macbeth affected when he learns of his wife's death? Consider: -The Action of Act 5-Macbeth is standing almost alone, most of his warriors have fled, and he questions what it was all for. -The Characters of Macbeth and Lady ...

*March 7, 2009*

**History**

Im not sure what this question is asking,can anyone help? Stidy sources F and G. What arguments do the writers use to justify the continuation of slavery and the slave trade?

*March 5, 2009*

**History**

I need as many reasons as to why slavery lasted so long.

*March 5, 2009*

**History**

I need loads of info on why slavery is wrong. It must say why making people live in harsh conditions is wrong aswell.

*March 3, 2009*

**RE**

How will humans evolve? What will happen to the natural world-and how will humans respond? What will happen to the global population? Will inequalities be solved or strengthened? What will be the advances in medical science? No more disease? More powerful viruses? Where will ...

*March 3, 2009*

**Languages**

ne- Slovenian nei- Norwegian le- Maltese i hope dis helps, lol

*February 20, 2009*

**english**

it would be good if the descriptions of th 5 Acts were 3, 4 or 5 ssentences to make the play sound interesting

*February 20, 2009*

**english**

Does anyone know a quick short really good summary of the story of Macbeth? Its for my theatre programme I'm doing. I also do a short bit about all 5 acts and the descriptions I've looked at on the internet are too long. Does anyone know a short quick way to describe 5...

*February 20, 2009*

**math**

cant you just use a calculator

*February 10, 2009*

**RE**

i have decided to go with a normal poem, is this good enough?? I look up into eternal Space, O' the vastness of it all, But the vastness of 'Space' within me, Makes outer space seem so small. From Earth I glared at the twinkling stars, And the sun that lit my way, ...

*February 10, 2009*

**RE**

i have to write a poem about 'your expression of the vastness of space/universe as a poem. i have all the ideas in my head about the universe being incredibly vast. but im rubbish at writing poems. Can anyone help or find a useful website that has a poem about this task??

*February 10, 2009*

**SCIENCE(ECOLOGY)**

There are two types of germination present. A hypogeal germination is where the cotyledons remain below the surface of the soil (e.g. maize and broad bean). The other type of germination is called epigeal germination, where the cotyledons are carried above the ground (e.g. ...

*February 7, 2009*

**chemistry**

yes, i do mean isotopes that undergo radioactive decay. However i do not really understand what this radioactive thing have to do with isotopes or unstable or stable.

*February 7, 2009*

**chemistry**

does anyone know any uses of isotopes?

*February 7, 2009*

**Chemistry**

im only askin 4 help!!! im not like telling u 2 say like all the uses.

*February 6, 2009*

**Chemistry**

I have to do an A4 page about Isotope uses and all the websites ive gone on are too complicated for me to understand. Does anyone know any uses of Isotopes?

*February 6, 2009*

**Physics**

Why does a pencil look broken if you hold it at an angle in a beaker of water?

*January 30, 2009*

**math**

i dunno. i think it just is cus deyr like nxt 2 each ova

*January 30, 2009*

**math**

are there only odd numbers in the 6* tables?

*January 23, 2009*

**maths**

List all the subsets(include the null set and the set itself. a) (p) b) (p,q) c) (p,q,r) d) (p,q,r,s) By the way the brackets are supposed 2 b the weird curly brackets.

*January 23, 2009*

**English**

it looks correct to me

*January 23, 2009*

**Physics**

thanks

*January 16, 2009*

**Physics**

The angle between an incident ray and the mirror is 30 degrees What is the angle of incidence? What is the angle of reflection? What is the total angle turned by the ray?

*January 16, 2009*