The answer is huesped the first one
un libro nuevo<span>a new book (masculine singular)dos libros nuev</span>ostwo new books (masculine plural) una mesa nueva<span>a new table (feminine singular)dos mesas nuev</span>as<span>two new tables (feminine plural)</span>
Answer: He developed differential and integral calculus
Explanation:
I don't understands neither, first you say that you are not okay and then you say that you are excited.
