Step-by-step explanation:
at s = -3
at s = -2
at s = -1
at s = 0
at s = 1
at s = 2
at s = 3
First difference
Second difference
Third difference
18 -12 -2 0 0 4 18
-30 10 2 0 4 14
40 -8 -2 4 10
-48 6 6 6
Rotation by 180° negates both coordinates.
.. B = (4, -11) . . . . . . . corresponding to the 1st selection
How many benches are needed for all the students is D
Corresponding Angles Theorem:
2y = 58
Divide both side by 2
y = 29 degrees