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Paper 12 maths

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guys in Q9 i correctly calculated A but i miscalculated B :(
hw many marks will i lose ?
 
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if I get 55/75 in P1 do I have any chance of A grade overall? How much would I need in M1?
 
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What was the answer for the question which asked to calculate the length of CD?
does anyone remember the coordinates of A and B (which was given in the question)?
thanks
 
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the second term if a GP is 9 less than the first term. The sum of the second and third terms is 30. Given that all terms are positive*, find the value of the first term.

a.r = a - 9 ; a.r + a.r^2 = 30
>> r = (a - 9)/a

>> 30 = (a - 9) + a.[(a-9)/a]^2
>> 30 = a - 9 + (a-9)^2/a
>> 39.a = (a^2) + a^2 - 18.a + 81
>> 2.a^2 - 57.a + 81 = 0
>> factorize to get (a - 27)(2.a - 3) = 0

a = 27 or a = 3/2
since r= -5 when a= 3/2, the terms become negative*(see question);

Ans: a = 27
:( :cry: :cry::cry::cry:
 
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