Need to check my answer which I'm not confident about my solution. The question based on Floating point systems, Roundoff Error. Please correct me if you think my answers are wrong, my question is on image capture here.
(a)
fl(x) = (4/10^1 + 3/10^2 + 1/10^3 + 2/10^4) * 10^1 = 0.4312*10^1
fl(y) = (4/10^1 + 3/10^2 + 1/10^3 + 2/10^4) * 10^0 = 0.4312*10^0
(b)
n = 1/2*B^(1-t) = 1/2*(10)^1-4 = 0.0005
(c)
Overflow = B^(U+1) (1-B^-t) = 10^4(1-10^-4) = 9999
Underflow = B^(L) = 10^-3 = 0.001
Thus (C) 12000 is Overflow and (D) -12000 is Underflow
=== Solution Done ===
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