In golf, scores that are under the expected score are represented
by negative numbers. calvin played three games of golf during
a tournament. his score for each game is shown in the table.

part a
which statement is true about calvin's score during the tournament?

a
calvin's score changed from game 1 to game 2 by -2.

b
calvin's score changed from game 1 to game 3 by -1.

c
calvin's score changed from game 2 to game 3 by -1.

d
calvin's score changed from game 1 to game 3 by-3.

part b
what was calvin's total score for the three games?

show your work.