In sets, the symbol ⋃ means to combine.
Set B is the set of all real numbers less than 3. This means from negative infinity to less than 3.
Set C is the set of all real numbers less than or equal to 7. This means from negative infinity to positive 7.
Therefore, the union of Set B and Set C is from negative infinity to positive 7. This can be written as (-∞, 7].
On the other hand, the intersection of Set B and C is from negative infinity to less than 3. This can be written as (-∞, 3)
