**Example 1** - no calculation required

The given equation can be interpreted as

total population in t years after 1998 = starting population in 1998 + average increase in population per year after 1998 for t years.

Hence, 130 is the average increase in population per year after 1998 for t years.

**Example 2** **Question 1 **- no calculation required

The given equation can be interpreted as

tusk size in m months after one year of birth = tusk size at one year + average increase in tusk size per month after one year of birth for m months.

**Example 2** **Question 2 **- no calculation required

For tusk size to increase by 1, 0.5583m must be equal to 1. Hence, m is the reciprocal of 0.5583 = 1/0.5583.