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A + B are done. I got a) 1/200 and b) 81/200. c) I did 2/10 x 9/20 = 9/100. Answers: 11/100. Explanation if you can, please. Thank you.

That approach makes more sense. I counted 4,4 twice so hmm. Thanks.

Thanks! :)

Thanks, so the whole total of 8 thing is pure logic? It's weird even with the explanation.

I did P(HT) x P(TH) x P (total of 8) = 1/4 x 1/4 x 1/6 Correct Answer: 5/72 My logic was there were 6 pairs of numbers that could make up 8, hence 6/36. Can anyone explain this to me, please? I don't do well with probability.

Thank you to both of you :)

A point P (x,y) moves so that AP and BP are perpendicular, given A = (3,2) and B = (-4,1). Find the equation of the locus of P. Yeah so, it was rather weird and I didn't even know how to start this one.

I couldn't get the simultaneous one with elimination method, but I just got it with sub.

For my half yearlies, just doing the chapter reviews for a few questions. Simplify: 3/(x-2) + 1/(x+3) - 2/(x^2 + x - 6) Simplify with a rational denominator: 3/({sqrt}5) + 2) - {sqrt}2/(2{sqrt}2 - 1) Solve simultaneously: x - y + 7 = 0 3x - 4y + 26 = 0 Sorry doesn't let...

My bad once again, "1/2 . x"

I must have made a typo, sorry. Thought I checked it. A = 1/2x(sqrt)(25-x²)

Thank you for that question. Now I've confused myself with the last one I posted, let's just start fresh. [hr] I've done a). How are we supposed to do b)? I've differentiated the eq. given in part a) and end up with -5x, but I don't know what it's supposed to equal? I must be missing...

You answered it. You said pretend they're x and y values, as in make x = r and A = h. Also is A = Area? Thank you. I'm interested in the working out of this in particular: And then Where does pi r3 come from? Sorry for the annoying questions.

There are no x and y values for Q11, I got a) done and just don't know what do with b). Help me, please. Also: Now what are we supposed to do, it only gives me the length of one said that is neither x nor y. What do I do?

Oh rightt, sorry and thanks :) I got it. Now to attempt the 3rd one all by myself.

Thanks, rather easy. Are you saying sub x = sqrt(125)/sqrt(3) into the SA equation or V equation? I'm not sure which one. Even then how are you supposed to do it with all the roots? Answers say the dimensions are 6.45 x 6.45 x 6.45. I'll wait for your answer to my question before attempting...

You can't realy do excursions for IPT :/ But just go somewhere relevant to the topic if you can. You'd most likely be able to attend a big lecture thing relating to whatever you're doing. We did this for legal studies last year.

I may add to this thread. So I struggle with these questions, I don't do too bad at the manipulating equation bit, but I just fail really badly on the calculus bit. Anywho, I've got these two: Thanks in advance. EDIT: More :/

Well isn't trap + simpsons rule used to find approximations of AREA? So you'd assume that its always asking for area?

Oh... :/ So which number needs to be on top of the bracket? Is it the higher or lower x value? Just to clarify. Thanks a bunch, my teacher rushed through 2 exercises so hmm.