Dev who had always disliked math has become an expert at algebra thanks to his teacher Mrs. Robinson.

Dev who had always disliked math, has become an expert at algebra, thanks to his teacher Mrs. Robinson.

Dev, who had always disliked math, has become an expert at algebra thanks to his teacher, Mrs. Robinson.

Dev, who had always disliked math has become an expert at algebra thanks to his teacher Mrs. Robinson.

Dev who had always disliked math, has become an expert at algebra thanks to his teacher, Mrs. Robinson.

While competing in a triathlon, Ian had to swim a mile and bike 50 miles then run 10 miles.

While competing in a triathlon, Ian had to swim a mile, bike 50 miles, and then run 10 miles.

While competing in a triathlon, Ian had to swim a mile, bike 50 miles and then run, 10 miles.

While competing in a triathlon Ian had to swim, a mile, bike, 50 miles, and then run 10 miles.

While competing in a triathlon, Ian, had to swim a mile, bike 50 miles, then run 10 miles.

distances, but Shannon

distances, but: Shannon

distances but Shannon

distances, but...Shannon

NO CHANGE

general and her sister, Eliza, is a New York City socialite who runs an orphanage and

general, and her sister, Eliza, is a New York City socialite who runs an orphanage; and

general her sister Eliza is a New York City socialite who runs an orphanage and

NO CHANGE

Jupiter, the largest planet in our solar system, weighs

Jupiter is the largest planet in our solar system, it weighs

Jupiter which is the largest planet in our solar system, weighs

Jupiter, is the largest planet in our solar system, weighs

NO CHANGE

included: a scavenger hunt a three-legged race, and a sleepover

included a scavenger hunt a three-legged race and a sleepover

included -- a scavenger hunt, a three-legged race, and a sleepover

team, her

team her

team. her

team; her

team, her

team her

team. her

team; her

NO CHANGE

Kaitlyn a star gymnast made the national team as a sophomore but she

Kaitlyn: a star gymnast made the national team as a sophomore, but she

Kaitlyn a star gymnast, made the national team as a sophomore but she

Jeremy loves anchovies on pizza, but his sister cannot stand them.

Jeremy loves anchovies on pizza; his sister, however, cannot stand them.

Jeremy loves anchovies on pizza, his sister however cannot stand them.

All are punctuated properly.