What is the distance between (5,-1) and (5,4)? A) 1 unit
B) 3 units
C) 4 units
D) 5 units

On a cm grid, point p has coordinates (3,-1) and point q has coordinates (-5,6) calculate the shortest distance between p and q give your answer to 1 decimal place

Can someone explain to me how to do

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i