Translate to an algebraic expression 1. a number decreased by 16.2. 8 times nate's speed.3. 20 added to half a number.4. 20 less than 4 times a number.5. the sum of the boxes length and width.6. 10 more than the product of the rate and the time.7. 5 times the difference of two numbers.

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.