18u^2. For verifying that count the entire squares of the triangle, and use the partial one to make complete squares.
<span>The input of days results in the output of total collected books. On day 1, 8 books were collected. Both inputs for days 2 and 3 have the same output of 13, meaning that no books were collected for day 3. After 5 days, 21 books were collected. The most books were collected on day 5.</span>
Answer:
C - 13*
Step-by-step explanation:
