Noah is helping to collect the entry fees at his school's sports game. Student entry costs $2.75 each and adult entry costs $5.25 each. At the end of the game, Diego collected $281.25.

Select all equations that could represent the relationship
between the number of students, s, the number of adults, a, and the dollar amount received at the game.

a. 281.25 - 5.25a = 2.75s
b. a = 53.57 - 2.75 5.25s
c. 281.25 - 5.25s = a
d. 281.25 + 2.75a = s
e. 281.25 + 5.25s = a