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Hey BOS, this may sounds like a stupid question but in what circumstances would i not use phenolphthalein as my indicator in a titration? According to wiki: An acid-base titration is the determination of the concentration of an acid or base by exactly neutralizing the acid/base with an acid...

This may be an easy questions but I'm just not seeing it. Any help is greatly appreciated, cheers. http://i.imgur.com/cpA9K.jpg

http://i.imgur.com/t5YSB.jpg Half Yearly's are tomorrow so any help would be great I have no idea how to do d (ii), something to do with an angle subtended at the centre of a circle is double that at the circ??? for e) how do i decide whether the vector between 2 points is z1 - z2 or z2 - z1?

http://i.imgur.com/BBY7H.jpg Sorry for all these questions, I definitely need more practice with complex no.'s. Any help is greatly appreciated.

http://i.imgur.com/rXlgT.jpg Comes from 2002 SBHS trial have no clue how to solve part ii

P is a variable point on the ellipse with equation x^2/a + y^2/b = 1 and S and S' are the foci. Show that PS and PS' are equally inclined to the tangent at P.

Prove that w, a complex cube root of unity, is a repeated root of P(x) = 3x^5 + 2x^4 + x^3 - 6x^2 - 5x - 4. EDIT(left out the other half of the q):Hence find the zeroes to the equation over the complex number field

Could someone walk me through the solution to this question? Im having a little trouble understanding what the hell i'm supposed to show. Thanks in advance

1.A unit square with the points ABCD, where A(1,0),B(1,1),C(2,1),D(2,0) i) a line, l, passes through the origin with a gradient m and cuts the sides AB and CD at P and Q respectivley. Comment on the possible values of m. ii) For what value(s) of m does the line l, divide the area of the...

If the questions doesnt give us the equation, do we still have to derive the range and max height formula or simply quote it?

The word EQUATION contains all 5 vowels. How many 3 letter "words" consisting of at least 1 vowel and 1 consonant can be made from the letters of EQUATION? okay, my working: 5C1(choosing 1 vowel from 5) x 3C1 (choosing one consonant)x 6C1(the rest) x 3!(no. of combs) =540 and the answers...

I've never been sure about questions that start with Show/Prove that blah = blah because in some instances you have to expand one side out and make it equal the other side just by using algebra while in other instances you have to use a diagram they've given etc. how do i know which is the case...

Since our school never finished this topic I had to teach myself the standard model and so I was wandering if my response to this dotpoint was correct. Q: Discuss the key features and the components of the standard model of matter, including quarks and leptons A: The standard model is a theory...

Eight people attend a meeting. They are provided with 2 circular tables, one seating 3 people, the other seating 5. i) How many arrangements are possible? ii) If the seating is done randomly, what is the probability that a particular couple are on a different table? for (i) i did this...

|2x - 1| < / = |x -3| This is another novincial thing I've forgotten how to do. i took the case where both sides are positive which gives me x >/= -2 then i took the case where both sides are negative which gives me the same answer but what about when one side is negative and the other side...

Anyone got any tricks for drawing inverse functions? I'm sure there was one i learnt but i' ve forgotten. Any tips or tricks are appreciated.

Hey guys, having trouble with this question: In the expansion (1+x+kx^2)^9 in ascending powers of x, the coefficient of x^2 is zero find the value of k. there are so many coeff of x^2 im sure there is another way then expanding everything out. Thanks in advance

My School's prac trial is coming up and I was wandering if air resistance is a valid response for why your experimental value is different from your theoretical value for motion type practicals e.g. determining a value for g using a pendulum because i remember one time i was marked incorrect for...

Some Math in Focus Q's i've completely forgotten how to find the volume of a solid of revolution formed between 2 lines 1. Find the volume of the solid of revolution formed if the area enclosed between y= x^2 and y= (x-2)^2 is rotated about the x axis 2. The area bounded by the curve y = x^2...

Interviews are in August and I'm in district 9750 Post up if you're applying or know anyone who is also if you've been tell us about it. How are the interviews like? Don't know what the heck i'm talking about? NYSF :: About