Factor 25x2+40x+16 completely. Enter your answer by filling in the boxes.
25x2+40x+16 = ([]x+[])²

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.