Final answer:
To simplify the expression, combine like terms: group the terms with 'f', which results in -1.9f, and then group the constants, resulting in -16. The simplified expression is -1.9f - 16.
Step-by-step explanation:
To simplify the expression -2.8f + 0.9f - 12 - 4, we start by combining like terms. The terms involving f can be combined, and the constant terms can be combined.
First, combine the f terms:
-2.8f + 0.9f = (-2.8 + 0.9)f = -1.9f
Next, combine the constant terms:
-12 - 4 = -16
Putting it all together, the simplified expression is:
-1.9f - 16