Complete the square to find the minimum value of the function

$$x^2-4x+20$$

Just type the minimum value.

(a)  

The function models the height in feet of an object above the ground t seconds after it was launched from the ground.

$$f\left(t\right)=-16t^2+40t+1$$

What is the maximum height of the ball? (a)   feet

What is the sum of the y-intercepts for f(x) and g(x)?