0.45 < 0.5 True
1) Examining those number sentences.
a)0.45 < 0.5 True for 0.45 is lesser than 0.5 just as 45 < 50
b) 4.05 = 0.45 False for 4.05 is greater than 0.45
c) 0.45 0.5 (Missing sign) ?
d) 4.05 < 0.45 False for 4.05 is 9 times greater than 0.45