Final answer:
To solve for the expression 12s + 6s - 15 when s is 11, first simplify to 18s - 15, then substitute 11 for s to get 198 - 15, which equals 183.
Step-by-step explanation:
The question asks us to solve the expression 12s + 6s - 15 when s is equal to 11. To solve it, first combine like terms (the terms containing s). The expression 12s + 6s simplifies to 18s, because 12 + 6 equals 18. Thus, the expression becomes 18s - 15. Substituting s with 11 gives us 18(11) - 15. Now, multiply 18 by 11 to get 198, and finally subtract 15 from 198, yielding an answer of 183.