Final answer:
None of the provided answer choices A. 13, B. 15, C. 20, D. 25 match the correct answer for (2x+10) when x is solved from (3x+5=15). The correct value of (2x+10) is 50/3, approximately 16.67.
Step-by-step explanation:
If (3x+5=15), we first need to solve for x. Subtracting 5 from both sides, we get 3x = 10, so x = 10/3. Now, to find the value of (2x+10), we substitute x with 10/3 which gives us 2*(10/3) + 10 = 20/3 + 30/3 = 50/3. As none of the options match our answer, it seems there might be an error in the provided options or in the way the question was posed. Answer choices provided were A. 13, B. 15, C. 20, D. 25, but none corresponds to the value of 50/3, which is approximately 16.67.