Answer:
D. a is equal to
![(1)/(4)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/r8zl28n0vf0ogg71i3r53apxva24c1inf4.png)
Explanation:
Let us assume that segment PQ is 8 units, so that its midpoint M is at 4 units to both P and Q.
Given that X is the midpoint of PM, this implies that X is at 2 units to both P and M.
Then;
PX = aPQ
⇒ = a x 8
= 8a
Therefore, a must be equal to
, so that;
PX = 8a
= 8 x
![(1)/(4)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/r8zl28n0vf0ogg71i3r53apxva24c1inf4.png)
= 2 units
Thus, a is equal to
is the correct option.