Answer:
(d) 1 < d < 2
(e) t ≥ 6
(f) -z ≤ 8
Explanation:
Symbol notation
- < means "less than".
- > means "greater than".
- ≤ means "less than or equal to".
- ≥ means "greater than or equal to".
- = means "equals".
A negative real number is any real number that is less than zero.
A positive real number is any real number that is greater than zero.
Zero is neither positive nor negative.
(d) d is between 2 and 1.
If d is between 2 and 1, it is greater than 1 and less than 2, but not equal to either number:
(e) t is not less than 6.
If t is not less than 6, then it is greater than or equal to 6:
(f) The negative of z is not greater than 8.
If the negative of z is not greater than 8, then it is less than or equal to 8.