How many flops (floating point operations) are needed to execute the following lines of MATLAB code?

Problem 2: Exactly how many flops are needed to execute the following code segments? a) for k - 1:n a (k) B (k, k) *v (n-k) ; = end b) for k - l:n xB (k, n-k+1:n) *v (n-k+1:n) end c) for k - 1:n-1 for j n-k:n = end end