6 :)
no. of books: 1 2 3 4
combinations: 12, 13, 14, 23, 24, and 34
Let the angle of elevation be θ.
We have a right angled triangle with an opposite of 300.5 ft. (306 - 5.5) and an adjacent of 400 ft. Recalling SOH CAH TOA, tanθ = O/A.
tan(θ) = 300.5/400.
θ = tan^-1(300.5/400).
θ = 36.9°.
Step-by-step explanation:
they need to add up to -56
and multiply to 180
-9y-9 simplification
-9y-9=0
-9y=9
y=-1
