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Can the answers be differential media & selective media?

Find the equation of the line normal to the curve of y=(3x-1)^3 with normal slope -1/36 and x>0.

The tangent to the curve y=4x^2 - 8x at a certain point is parallel to the x-axis. Find the equation of that tangent.

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Please include all relevant reagents and products of the reaction.

A box without lid is to be made from rectangular piece of card board of 8 cm by 14 cm, by cutting equal squares of side x cm from each corner and folding up the sides. Find the value of x such that the volume of the box may be a maximum. Correct your answer to 2 decimal places.

Please help...

question says all. easy 10 points.!

100cm³ of 0.1M(mol/dm³) Na2CO3 solution reacts with an excess sulplhuric acid according to the reaction.

Na2CO3 + H2SO4 -------> NaSO4 + H2O + CO2

Calculate

(i)the number of moles of Na2CO3 reacted,

(ii)the number of moles of Na2SO4 produced,

(iii)the mass of water produced,

(iv)the volume of CO2 produced.

PLEASE show full working .. I have no idea how to do this mol concept.... I'm weak in Chemistry. Please help!!

128g of sulphur dioxide was reacted with oxygen to produce sulphur trioxide. 140g of sulphur trioxide was produced in the reaction. Calculate the percentage yield of the sulphur trioxide.

Full working with explaination please! Tomorrow is test.. i don't understand percentage yield!!!

Ammonia and carbon dioxide react to form water and a solid urea, (CON₂H₄). In the reaction, 48dm³ of carbon dioxide at r.t.p are converted to urea.

The equation for this reaction is 2(NH₄)+ CO₂-----> 2(H₂O) + (CON₂H₄)

Q1 .Calculate the volume of ammonia at r.t.p which reacted.

Q2. Calculate the mass of urea formed.

Thanks in advance. Please show full working! :)

Will iphone5 still be released?

Any opinion about this? Feel free to share your views. I'll pick the best one :)

(x^2+2x+15)/((x+3) (x-1)^2 )

To get a better view of the question, here's a link --> http://static.picuna.com/photos/original/20237.png

In the diagram, the circle touches AB produced at P, AC produced at R, and BC produced at Q. AB= 23 cm, BC = 17 cm and AC = 20 cm. Find the lengths of AP and CQ

Diagram -->http://imageshack.us/photo/my-images/269/unled2sl....

In the diagram, H and K are the centres of two circles whose radii are 3 cm and 5 cm respectively. The two circles touch each other at C and TN is a common tangent to the circles at A and B. Find the length of AB.

Diagram --> http://img849.imageshack.us/img849/6349/unledxay.p...

c=carbon

cl= chlorine

f= fluorine

Thanks :)

(logbase10x)^2 = 3 logbase10x

how to solve.. full solution please...

x is an unknown. not multiply.

help me please.... i don't understand physics..

1 question.

Given that 4x³-6x²+1= (x-2)(x+1)Q(x)+ax+b, where Q(x) is a polynomial, find the value of a and of b.