Final answer:
The simplified expression of -2.3f + 0.9f - 15 - 9 is -1.4f - 24 after combining like terms; -2.3f and 0.9f total to -1.4f, and -15 and -9 sum to -24.
Step-by-step explanation:
To simplify the expression -2.3f + 0.9f - 15 - 9, combine like terms starting with the 'f' terms. The coefficients -2.3 and 0.9 can be added together:
-2.3f + 0.9f = (-2.3 + 0.9)f = -1.4f
Then, combine the constant terms:
-15 - 9 = -24
These two simplified parts can then be put together to give the final simplified expression:
-1.4f - 24