Answer:
i think it is length hopefully that's correct
Answer:

Step-by-step explanation:
To preface, your figure is going to be a line segment, with
as your midpoint, in between points
& 
With that being said:

Identify your values:

Substitute the values into the first equation:

Combine like terms:

Subtract
from both sides of the equation:

Divide by the coefficient of
, which is
:

Substitute
for
in segments
&
:




Solve:


Check your answers by substituting:


1 and 3 they share a relationship of +2, 3 and 6 share x2, 5 and 8 share +3, 7 and 21 share x3