Since we have the symbol ⋃, we are looking for the union of the given sets.
First, we will write D in roster form.
D={1, 3, 5, 7, 9}
A union of two sets is the set that contains allelements found in both sets. Therefore, the union of C and D holds all elements that are in both C and D. Note that a union only contains unique values, so if any elements exist in both sets, we will cross out the duplicates.
D&={1, 3, 5, 7, 9}
C&={2, 5, 7, 10}
C ⋃ D &={1, 2, 3, 5, 7, 9, 10}
