PLEAASE LOOK AT THE PICTURE!!

The 50_59 range

Step-by-step explanation:

0-9 range: 9-0 = 9

9×16 (number of trees) = 144

10-19 range: 19-10=9

9 ×6= 54

20-29 range: 9×6 = 54

30-39 range: 9×10= 90

40-49 range: 9×14= 144

50-59 range: 9×4 = 36

Therefore, The range 50-59 occurs least frequently because it has the lowest number of all of them(36).

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .