Determine if the set is the empty set. {x|XEN and 7

Explain each step, excluding those that are labeled as “no justification needed.” For each step, identify the property of the real numbers being used and explain how that property is being applied.   I attached a picture of the step I need help with, along with the properties.

Discrete Structure Math

Determine if the set is the empty set. {x |x is a number less than 3 or greater than 15} Choose the correct answer below. The set is not the empty set. The set is the empty set.

write a word description of the set {1,3,5,7,9} The set of _________ less than ________.

Express the set in roster form. B = {x | xEN and x ≥ 3} Choose the correct answer below. O A. B={4, 5, 6, 7} O B. B = {4, 5, 6, 7, ...} O C. B={3} O D. B=(3, 4, 5, 6, ...} OE. B=(3, 4, 5, 6} OF. B=(3, 4, 5, 6, ..., 100} OG. B=Ø