13. A container ship can hold up to 18,000 twenty-foot containers. If the ship already has 7,489 containers on board how many more containers (c) can be loaded? A Fewer than 10,511 additional containers can be loaded onto the ship. 18,000gt 7,489+c B Up to 10,511 additional containers can be loaded onto the ship. 7,489+cleqslant 18,000 C An infinite number of additional containers can be loaded onto the ship. 18,000gt 7,489 D More than 10,511 additional containers can be loaded onto the ship. 7,489+cgeqslant 18,000 (D)

The correct answer is B. Up to 10,511 additional containers can be loaded onto the ship.<br /><br />To solve this problem, we need to find the number of additional containers (c) that can be loaded onto the ship. We know that the ship can hold up to 18,000 twenty-foot containers and it already has 7,489 containers on board.<br /><br />We can set up the inequality:<br /><br />$7,489 + c \leq 18,000$<br /><br />Subtracting 7,489 from both sides, we get:<br /><br />$c \leq 10,511$<br /><br />Therefore, up to 10,511 additional containers can be loaded onto the ship.