#### Answer

(a) The scale pushes up on Margie with a force of 543 N.
(b) The interaction partner of this force is the downward force of 543 N which Margie exerts on the scale.
(c) The floor pushes up on the scale with a force of 588 N
(d) The interaction partner of this force is the combined weight of Margie and the scale pushing down on the floor with a force of 588 N

#### Work Step by Step

(a) The scale pushes up on Margie with a force of 543 N.
(b) The interaction partner of this force is the downward force of 543 N which Margie exerts on the scale.
(c) The floor pushes up on the scale with the sum of Margie's weight and the scale's weight. Therefore, the floor pushes up on the scale with a force of 543 N + 45 N which is 588 N
(d) The interaction partner of this force is the combined weight of Margie and the scale pushing down on the floor with a force of 588 N