Research Summary: Larval length was measured every three days before the next observation was missed. The visual shows Day (d) and larval length (mm) data: 2 d -> 3.1 mm; 5 d -> 6.4 mm; 8 d -> 10 mm; 11 d -> 14.2 mm. Using the trend from the last two displayed points, which value is the best estimate of larval length just beyond the data at 12.5 d?