Please solve: Q E[ -34, 0. 31] evaluate -Q?

Question

I do not understand how.

Answer 1

Do you mean Q is an element of the interval [-34, 0.31]?
If so, then -Q would be an element of the interval
[-0.31, 34]
Or is this some sort of exponent notation?
Your question is not clear.

Answer 2

-Q E[-0.31, 34]
or if exponential then:
-Q E[-34, -0.31]