Final answer:
To find out how far the snail will be from the rock after 9 minutes using the equation d = 3t, we substitute t with 9 and calculate d = 3 x 9, which results in d = 27 inches.
Step-by-step explanation:
The student is asking about a linear relationship between distance and time for a snail moving away from a rock. The equation provided, d=3t, can be used to determine the distance the snail is from the rock at a given time. To find out how far the snail will be from the rock after 9 minutes, we simply need to substitute t with 9 in the equation.
So the calculation will be: d = 3 × 9 which gives us d = 27. Therefore, after 9 minutes, the snail will be 27 inches away from the rock.