3. The table describes Kenton's running progress during his training. In the table, d represents the day number, and f represents the total number of miles he ran since he began training.
d
2
5
7
10
12
t
5
12.5
17.5
25
30
(a) Use words to describe the relationship between the day number and the total number of miles since
Kenton began training.
(b) Use an equation to illustrate the relationship between the day number and the total number of miles
since Kenton began training