Answer:
2bd
Step-by-step explanation:
29°
Consider the right triangle between the plank and the ground
the angle can be found using tangent ratio
tanx° = 
where adjacent = 18 and opposite = 10
tanx° = 
x =
(
) = 29.0546 ≈ 29°
Answer: Mean Absolute Deviation (MAD): 14.375
Step-by-step explanation: