You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

[EX Q]: Fred has 5 baseball cards. Melanie bought 3 of Fred's baseball cards.How many baseball cards does Fred have now?
[EX A]: 2.0

[EX Q]: This afternoon Craig left school, rode the bus 3.8 miles, and then walked 0.2 mile to get home. How much farther did Craig ride than walk?
[EX A]: 3.6

[EX Q]: There are 5 oak trees currently in the park. Park workers will plant 4oak trees today. How many oak trees will the park have when theworkers are finished?
[EX A]:
9.0