exam Maths Puzzle Numerical Ability

if bob had 4,088 marbles and lost 3/8 of them how much would he have left?

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If someone could help me with this probelm I would be very thankful. I should find the area of a circle with radius 4 (and the answer should be in pi), could someone maybe explain how I should solve the problem? what can a and k be so both points are on the graph of function?
points are (1,11) and (2,-19); function is y= a(x+1)^2 + k
how can i find the function so that both poitns are on the graph??