How to factor this? (Algebra)

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x

How do you find principle and simple interest

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.