Complete the statements about the closure of sets.
the set {0, 2, 5) is
under addition, as is illustrated by the fact that adding 2 and 5 results in 7, which
is not included in the set.
the set of all integers is closed under addition, as is illustrated by the fact that adding -20 and 6 result in -14, which
in the set.
the set of all polynomials is
under addition, which is illustrated by the fact that adding 3x² - 2 and
7x^4+ 4x results in 7x^4 + 3x2 + 4x - 2. which is
in the set