Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (x) cos (3t) where x is in m and t is in s. what is the distance (in m) between the first two antinodes?

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?

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.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.