Can someone please explain these to me

Exercise 7. Symbolize the following by using quantifiers, predicates, and logical operators(connectives. a) The square of any real number is greater than or equal to zero. b) Some integers are multiples of 7. c) There is a unique natural number such that 16. d) For each integer, there exists an integer such that their sum is 0. Exercise 8. In this exercise, the predicate P(x) denotes z is an odd integer and Q(x) denotes is a prime integer, and R(x) is a2 is an odd integer. Write a statement in English corresponding to each symbolic statement. a) Vz(P(z) ? R(z)) b) Vz(P(z) Q(z))