3/25 as a decimal cause i don't understand it

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?