1/2 (m + 3)
Step-by-step explanation:
let the number of miles Laura ran = m
Kirk goal of running three miles more than Laura:
Kirk goal = m + 3
He ends up only running half of his goal:
half of his goal = 1/2 (m + 3)
The number of miles that Kirk ran in terms of m = 1/2 (m + 3)