Final answer:
The question involves simplifying an algebraic expression by distributing and combining like terms. The answer is a simplified linear expression representing 18x - 10.
Step-by-step explanation:
The student's question involves simplifying an algebraic expression which is a common task in middle school mathematics. To solve the expression, we distribute the 6 into the terms within the parenthesis (2.5x – 3) to get 15x - 18. Then we combine like terms with the rest of the expression which is (3x + 8). So, we get 3x + 8 + 15x - 18, which simplifies further to 18x - 10. This expression represents a linear expression in one variable x.