Can someone help me with this THX

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

What is the y intercept of f(x)=(1/2)^x?

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?