Answer and Step-by-step explanation: The distance between 2 points is the distance of the straight line that passes through both points. It calculated using the following formula:
d =

1) For A (2,1) and B(4, -1)
d =

d =

d = 2

2) 5 =

25 = x² + 1
x² = 24
x = 2

3) d =

d =

d = 7
