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astarmathsandphysics:
Jane's bank balance put $1000 into a savings bank account for her on each birthday from her 10th to her 18th. The account pays interest at 6% for each complete year that the money is invested. How much money is in the account on the day after her 18th birthday+
?It will be
it is a geometric sequence with first term 1000 and common raio 1.06 and 9 terms

astarmathsandphysics:
If coordinates are (2,-63); is the y coordinate considered for deciding the maxima or minima?
n if its -ve then its minima n if +ve then maxima?
It is not y that has to be negative for a min. has to be positive
and  has to be negative for a max

explained here
http://www.astarmathsandphysics.com/a_level_maths_notes/C1/a_level_maths_notes_c1_maxima_and_minima_the_second_differential_criterion.html

zara:
yea i got it astar Thanks..

astarmathsandphysics:
The function f is defined by f : 2x^2-12x + 13 for 0 <=x <=A, where A is a constant.
(i) Express f(x) in the form a(x + b)2 + c, where a, b and c are constants. [3]
(ii) State the value of A for which the graph of y = f(x) has a line of symmetry. [1]
(iii) When A has this value, find the range of f.

i)2x^2-12x + 13=a(x + b)^2 + c=ax^2+2abx+ab^2+c
2x"2=ax^2 so a=2
-12x=2abx=4bx so b=-3
13=ab^2+c=2*(-3)^2+c so c=-5
f(x)=2(x-3)^2-5
ii)A=6
iii)max value of f(x) is f(6)=13
range of f is [-5,13]

zara:
Find the sum of the infinite series 1/103+1/106+1/109+... expressing ur answer as a fraction in its lowest terms.

Hence express the infinite recurring decimal 0.108108108...as a fraction in its lowest terms.

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