Final answer:
The student's question is about simplifying an algebraic expression by combining like terms. The 'f' terms are combined to -2f, and the constants simplify to -18, resulting in the expression -2f - 18.
Step-by-step explanation:
The student's question '-2.8f + 0.8f - 15 -3' involves simplifying an algebraic expression, which falls under the subject of Mathematics and is typically covered in High School curriculum. To simplify the expression, you combine like terms. The terms containing 'f' can be added together, and the constants can be combined as well.
Step-by-Step Explanation:
- Combine the 'f' terms: (-2.8f + 0.8f) simplifies to -2f.
- Combine the constants: (-15 - 3) simplifies to -18.
- The simplified expression is therefore -2f - 18.
The given expression is:
-2.8f + 0.8f - 15 - 3
Combining like terms:
(-2.8f + 0.8f) - 15 - 3
-2f - 18
The simplified expression is -2f - 18.