d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.
step-by-step explanation:
answer: '
the distance between points l and m
5
10
15
20
25
30
35
40
45
50
55
answer: 8 years
the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.