Question

Please help! I’m kinda lost!!!

Answer 1

1. D
2. B
3. A
4. C

Explanation:

A curved bracket ( ) corresponds to a < symbol. A square bracket [ ] corresponds to a ≤ symbol. The square bracket signifies that the point is included in the interval. The curved bracket indicates the point is not included in the interval.

The interval a,b means a is the lower end of the interval and b is the upper end. The values of the variable lie between. So, for example, (a, b] means ...

a < x ≤ b

1. [3, 5) ⇒ 3 ≤ x < 5 . . . matches D
2. (3, 5) ⇒ 3 < x < 5 . . . matches B
3. (3, 5] ⇒ 3 < x ≤ 5 . . . matches A
4. [3, 5] ⇒ 3 ≤ x ≤ 5 . . . matches C