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.

Tom purchased a Batman game for $13.60, and a Superman gamefor $5. Tom already owns 2 games. How much did Tom spend onvideo games?
18.6

Alyssa's cat had 8 kittens and 8 had spots. She gave 4 to her friends.How many kittens does she now have?
4.0

Tom has 9 yellow balloons Sara has 8 yellow balloons. How many yellow balloons do they have in total?
17.0