Help if don't know don't answer and link i will report

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.

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount

What is 0.000008 meters in scientific notation