book Maths Puzzle Numerical Ability

The population of Mattville was 41,209 in 1984. If this population was 5015 less than twice tha population of Mattville in 1978, what was the population increase in those 6 years?

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book Other Question

Can you help me find the vertex and graph to this problem.

v=-u^2-8u+9
I have (-u+1)(u+9)=0
intercepts being u=(1,0)
and u=(-9,0)

v=????? and how to graph. Is the above co log2 16 = 8.2 (exp -x), then x=

a) -7 b) -4/3 c) -1 d) -2/3 e) 1

exponent is -x in the 8.2 problem