the area of a square is defined by, a(x) =x^2 - 18x + 81. find a polynomial expression that represents the length of the side of the square.

(x - 2)
(x - 3)
(x - 6)
(x - 9)

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.