Question

After m

Answer 1

8 months; 
10+3(8)= 10+24= 34 mm

3 years;
10+3(36)= 10+108= 118 mm

Answer 2

length of finger nail in m month =10+3m
length of finger nail in 8 months =10+3*8
=10+24 =34mm
 I think thats the answer but im pretty sure thats the answer