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Well, that explains why I couldn't find the answer. I've got it now, thanks. :D

Thanks very much. Now I have another problem; A school committee is to be made up of 5 teachers, 4 students and 3 parents. a) If 12 teachers, 25 students and 7 parents apply to be on the committee, which is chosen at random, how many possible committees could be formed? This part I've figured...

Thanks, now I have a new problem; A table has 4 boys and 4 girls sitting around it. a) Find the number of ways of sitting possible if the boys and girls can sit anywhere around the table. = 8P7 = 5040 b) If the seating is arranged at random, find the probability that; i) 2 particular girls...

Thanks, but I'm still stuck on the last one...

I'm having a lot of trouble with permutations and combinations, so I was hoping someone here could help me out with a few questions. Please make sure that you explain your working; I really want to understand this topic... The first question asks; A queue has 4 boys and 4 girls standing in...

Apparently the answer is 3x - 9y - 22 = 0, x > 4/3, but so far these sheets have been fairly unreliable, so who can tell?

I'm not sure how to tackle this question, can anyone help me out? It asks; The point P (x, y) is equidistant from the lines y = -2 and 3x - 4y - 12 = 0, and lies in the shaded region of the diagram. Find the equation of the locus of P.

Time for another question; A triangle PQR is right-angled at Q. S is the point on PR such that QS is perpendicular to PR. Let angle RPQ = x. You are given that 2PS - QR = PR. a) Show that 2cosx - tanx = secx. b) Deduce that 2sin2 + sinx - 1 = 0. c) Find x.

Okay guys, got time for one more? Here it is; The rectangles ABCD and DFBE are congruent with BA = FD = 7 and DA = ED = 3. a) Show that the length AT = 20/7 b) Find the area of the quadrilateral BWDT.

Man, I can't believe I forgot about the sine rule. Thanks. :)

Got another one for you. I'm having trouble with the second part of this question. I'm not sure if I should use the cosine rule or if there's a better method. It asks; The triangle ABC is isosceles, with angle BCA = ABC = 72o and sides AB = AC = 1 unit. BD Bisects angle ABC and BC = x. a)...

Thanks guys, that really clears that up. :)

Lets see if anyone can help me out of this one; ABC is a triange, in which AQ bisects angle CAB and angle PBA = angle BCA prove that PB = QB.

It's a bit late, but thanks for your help. ;) Now I've got a new problem; A ball is projected horizontally from a cliff of height 245m, and reaches the ground at a horizontal distance of 350m from the foot of the tower. Determine the intitial velocity V, and the velocity (direction and...

Maybe, which would explain why I was having such a hard time solving this. The solutions for the papers I'm working on have proven rather unreliable. I'll ask my maths teacher next time I get a chance.

Can anyone help me out with this coordinate geometry question? It asks; The diagram shwos the points A (-2, 0), B (1, 4) and the point C which lies on the x-axis. D us the midpoint of the interval AC. F is a point on AB such that DF is parallel to BC. a) Find the gradient of AB. Easy, the...

I'm stuck on this trigonometry question, can anyone help me out? It asks; In the figure, ABCD is a rhombus in which AB = 60cm, and angle A = 60o. P is a point on AD and AP = AQ = 2cm. Angle PQC = xo. P is joined to C. a) Write down the length of PQ, gibing reasons. b) Show that PC = QC c)...

Hmmm... My working turns out quite close to the answer, maybe the solutions are wrong... EDIT: Yeah, that's what I got.

The answer on the worksheet is pi(4√(3) - 19/3) units3. I didn't get this answer when subbing in the numbers...

One more time; The region bounded by the curve y = 2√(x) - 1, the lines x = 3, x = 4 and the x-axis is rotated about the x-axis. Find the volume of the solid of revolution formed. Here's my working... = y2 = (2x1/2 - 1)2 = y2 = 4x - 4x1/2 + 1 = V = pi 34∫ (4x - 4x1/2 + 1) = V = pi[2x2 -...