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Paper 12 maths
Don't worry. They'll credit your bid to calculate the perimeter of the greater arc (AB) and the chord length too. The examiner will penalize you for the area and you'll lose the A1 mark. ~ 2 marks. I'm sure you've done well. :) -
Paper 12 maths
Okay. Let me see how far I can recall.. ;) tanx + 1/tanx = (sinx/cosx)+(cosx/sinx) = (sin^2 x + cos^2 x)/sinx.cosx = 1/sinx.cosx Q.E.D now, solve for 2/sinx.cosx = (an expression with tanx); 0 < x < 180 >> 2*(tanx + 1/tanx) = (RHS) [from the first part] factorize to get (tanx - 1)(tanx + 2) =... -
Paper 12 maths
I'm sorry but the plate was not made by removing the triangular piece. In fact, it was not a triangular 'piece' at all - it was a hint. The dotted lines merely showed the radii of the circular plate which met at the ends of chord AB, making it easier for the candidates to use trigonometry to... -
Paper 12 maths
g-1(x)= (8/x) + 3 (x=/0) you solve for the range of k by supposing the discriminant: b^2 -4.a.c<0 >> 0<k<(64/9) -
Paper 12 maths
I'm afraid you're erroneous. The plate was circular with a vertical edge made by chord (AB) and not the 'dotted' circular sector which looked somewhat like Pacman.;) The area is 146 cm^2 (correct to 3 s.f) -
BIOLOGY PRACTICAL P33
You're correct. The range for the mean diameter of erythrocytes is ~ 6.0 to 8.0 um; but since the cells underwent lysis, the mean should be < 8.0 um (standard diameter of a turgid erythrocyte). -
Paper 12 maths
0<k<(64/9) [using the logic that the discriminant (b^2 - 4.a.c)<0 if there are 'no solutions'] -
BIOLOGY PRACTICAL P33
>> using narrower ranges of concentrations to obtain accurate [unknown]; >> using a fast dye (safranin red, methylene blue, fast green, I2 in KI); >> The onions must be placed in their respective solutions for the same period of time. -
Paper 12 maths
The paper quite extended, but I managed it in 1 1/4 hours, leaving 30 minutes for revision. Here are some of the answers: (volume of rotation about x-axis): 12 pi binomial theorem: a= 5 GP>> first term (a)= 27 AP>> a = 9, d= 2 unit vector scalar multiple: 1/sqr(61) (coordinates): A(4,6)... -
How was Math P1??????
The paper quite extended, but I managed it in 1 1/4 hours, leaving 30 minutes for revision. Here are some of the answers: (volume of rotation about x-axis): 12 pi binomial theorem: a= 5 GP>> first term (a)= 27 AP>> a = 9, d= 2 unit vector scalar multiple: 1/sqr(61) (coordinates): A(4,6)... -
BIOLOGY PRACTICAL P33
It was a SIGMOIDAL graph. How do expect candidates to calculate the [NaCl] when 50% erythrocytes were destroyed from a BAR graph? We were plotting a cumulative frequency curve. :cool: