Any body know how to do this

What are the solutions to the equation 4x2+3x=24-x

Can you me find the missing length. i attached an image.

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.