Question

[10,∞) ∩ [7,∞) = [10,∞)
^- Is this incorrect?

Answer 1

no it is correct as the interval [10,infinity) is common between both intervals or number sets

Answer 2

Just to warn you be careful dont confuse


The first one means both sets are added together, the second one combines common numbers of the set but excludes numbers that are not shared between sets

Answer 3

O.K.