First, using the order of operations, you would solve inside of the parenthesis.

(21.69 - 24.99)

(-3.3)
Next, you would solve the remainder of the equation.

× -3.3 =
-1.1Now, all you would need to do is round the decimal to the nearest tenths (It doesn't need to be rounded in this case).
-1.1The answer would be -1.1. I hope this helps!