What is the y intercept of the line? y= -7x +1

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)