From the 3 options listed, both

in and

in could be measures found using a ruler with eighth inches marked, because those decimals can be written in terms of eighth fractions.

The other option,

in, is not a possibility because 0.1 cannot be written as a fraction of 8 that is marked on the ruler.
Answer:
(3, -3)
Step-by-step explanation:
Use the midpoint formula.
x = (x₁ + x₂) / 2
-1.5 = (-6 + x) / 2
-3 = -6 + x
x = 3
y = (y₁ + y₂) / 2
1 = (5 + y) / 2
2 = 5 + y
y = -3
The other endpoint is (3, -3).
Graph: desmos.com/calculator/aze920ns2h