In a computer game, players complete levels by arranging captured objects in a triangular pattern. The triangle for level n has a bottom row with n objects, and each successive row
above has one less object until the top row, which has one object. The
function (n) = 0.5n^2 + 0.5n gives the total number of objects required to complete a level.
t
where n is the level number.
3. A player started at level 3 and ended at level 7. What is the average rate of change
between these levels ? Explain what your answer means in context.