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Answer:
6. First choice
7. Second choice
Step-by-step explanation:
For number 6, The first choice has a closed circle and the arrow goes to the right, meaning greater than or equal to
For number 7, all values are include except where the open circle is
t ≥ 0 - black circle, draw black line to the right of 0
≥ - black circle
( ---≥ ) draw black line to the right
x ≠ -4 - open circle