Derive the equation of the parabola with a focus at (0, 1) and a directrix of y = −1

For each sentence below, find the value of x that makes each sentence true. (515) 5 = 25* x= (813)2 = 4* x=

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Ineed here’s a picture of the question