Which expression is equivalent to -2.1 + (-5.9) + (-3.7)? a. (2.1 + 5.9 + 3.7) b. (2.1 + 5.9) + (-3.7) c. -2.1 - (5.9 + 3.7) d. -(2.1 - 5.9) + (-3.7) explain so i can understand.

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.