Add all the sides. Write the expression, in the simplest form.

8cm, 8cm, 9x, 9x

18x+16 cm

Step-by-step explanation:

Combine the like terms. 9x+9x = 18x and 8+8=16

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.