Figure $2-4$

Graph $($a$)$ Graph $($b$)$

Refer to Figure $2-4,$ Graph $($a$).$ The opportunity cost of moving from point S to point R is

Question $6$ options:

$2$ trucks.

$2$ tractors and $2$ trucks.

$2$ tractors.

$4$ tractors.

Question $7(1$ point$)$

Economists make assumptions to

Question $7$ options:

minimize the number of experiments that yield no useful data.

develop models when the scientific method cannot be used.

provide issues for political discussion.

simplify the complex world and make it easier to understand.