It's in passive voice.
A good rule of thumb for cases like this is that if it has any variation of the verb "to be" (is, was, were, etc.) it's passive voice.
If you wanted to switch it to active voice you need to get rid of "is", and this is usually done by switching the subject and the object (so while in the original sentence, the race car is the doing the verb, to switch it you'd need to make the sixteen-year-old boy be the one doing the verb). This new sentence would be something like:
The sixteen-year-old boy drove the racecar
Answer:
Run-on
Explanation:
"There's a new smart-phone app that will write your English essays for you" and "the program has terrible grammar" are both independent clauses, incorrectly joined without correct punctuation. There should be a comma before the conjunction "but".
