How do i find the variable for 3y+4-y=3

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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.