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This is a combination problem. Order does not matter and the books are all different. You would write this as 21C5 or . Combinations are not fractions.
The answer is
which = 20349 different ways these books can be chosen.
Let the starting position be A, and the ending position of the glide be B.
The triangle ABC shown in the figure, is a right triangle with side lengths 16m and 0.8 m.
The angle of the squirrel's path below the horizon is BAC.
Using right triangle trigonometry:
tan(ABC)=(opposite side)/(adjacent side)=0.8/16=0.05
to find m(ABC) we calculate arctan(0.05) which is 2.86°
Answer: 2.86°
The triangle ABC shown in the figure, is a right triangle with side lengths 16m and 0.8 m.
The angle of the squirrel's path below the horizon is BAC.
Using right triangle trigonometry:
tan(ABC)=(opposite side)/(adjacent side)=0.8/16=0.05
to find m(ABC) we calculate arctan(0.05) which is 2.86°
Answer: 2.86°