I want to know if my answers are correct for the following question. If they are wrong or you have a better solution please tell me (I could not answer 3 so I left it incomplete). (1 is relational algebra, 2 is tuple relational calculus, 3 is domain relational calculus)

3. Consider the following relational schema. person (name, age, gender) frequents (name, pizzeria) eats (name, pizza) serves (pizzeria, pizza, price) 3.1. Write relational algebra, tuple relational calculus and domain relational calculus expressions for the following queries: a) Find all pizzerias frequented by at least one person under the age of 18. 1. Tipizzero Upesumare Freezealt name Aage esperant fue quarte) 2. E se forquants Stipizzum] SI pizzerii) a tu e Person (age 218) } 3. & april