Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

Given the expression:

1.

we know:

then;

Therefore, the value of expression is -16 i.e negative.

2.

we know:

then;

Therefore, the expression is 16 i.e Positive.

3.

we know:

then;

Therefore, the expression is 16 i.e Positive.

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.

y=x+9

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step-by-step explanation: