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