a)
closingPrices = [100 101 102 100 102 104 103 98 96 101];
b)
plot(1:10, closingPrices);
c)
function dailyReturn = dailyReturns ( closingPrices )
n = size(closingPrices , 2);
dailyReturn = zeros(n, 1);
for i = 2:n
dailyReturn(i)= closingPrices(i)-closingPrices(i-1);
end
end