David began walking to get back in shape. He plans to walk for 5 and a half minutes on the first day and increase his walking time by 45 seconds each day. Model/create a recursive or explicit formula for David's exercise times.

T = 5.5 + 0.75 (d - 1)

Step-by-step explanation:

David plans to walk for 5 minutes and a half minutes on the first day and increase his walking time by 45 seconds each day.

Now, 45 seconds can be expressed as 45/60 minutes = 0.75 minutes.

Therefore, the model of the equation which represents David's exercise time is

T = 5.5 + 0.75 (d - 1), where T is presented in minutes and d is the number of days he exercises. (Answer)