i have no idea about a but
B. LN corresponds to EF
MN corresponds to DF
E corresponds to L
F corresponds to N
The driver's tip was $1.45 because the trip cost $8.55 (2.25+1.5+1.5+1.5+1.5+ 0.3) and Eric gave the driver $10 so to find how much the driver got tipped, you need to subtract 8.55 from 10 so $10 - $ 8.55 = $1.45
The patch doubles in size each day so, on the 47th will be half the size than on the 48th day