Question 9 • Algebraic Reasoning
As x increases by 1, the sum function’s values go from 8 to 10 to 12 to 14, increasing by 2 each time. That constant rate of change means the sum function is linear. The volume values are 15, 24, 35, and 48, whose increases are 9, 11, and 13, so the volume function is not linear. Therefore, the statement that the sum function is linear but the volume function is not is correct.
AI-written and checked against the verified answer.