Final answer:
Erik hiked down the mountain for four days at a rate of 0.75 miles per day. The total change in his position on the mountain after 4 days is 3 miles.
Step-by-step explanation:
Erik is hiking down a mountain at a consistent rate of 0.75 miles each day for four days. To calculate the total change in Erik's position on the mountain after 4 days, we can multiply the daily distance hiked by the number of days. This calculation will look like this:
0.75 miles/day × 4 days = 3 miles.
Therefore, after four days, Erik will have hiked a total of 3 miles down the mountain. This is the change in his position.