I don’t understand this question please help

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.

Graph the line with the given slope m and y-intercept b. m=-3,b=1

What is the mean of the data set 125, 141, 213, 155, 281