According to Newton’s first law of motion, when will an object at rest begin to move? when its inertia decreases to zero
when an unbalanced force acts upon it
when the action and reaction forces are equal
when two equal and opposite forces act upon it

An object at rest will begin to move when

b. an unbalanced force acts upon it.

It is basically saying when a force is applied to an object, it will move.

Explanation:

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B. when an unbalanced force acts upon it.

Explanation:

when a force is applied to an object, it will move.

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b: to eliminate competition from other farmers

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .