Select the best interpretation of {{MATH_6}} for {{MATH_7}}. {{CMD_8}} {{CMD_9}}{{MATH_10}} is the altitude at {{MATH_11}}.{{CMD_12}} {{CMD_13}}{{MATH_14}} is the average rate of change of the altitude on the interval {{MATH_15}}.{{CMD_16}} {{CMD_17}}{{MATH_18}} is the velocity of an object at {{MATH_19}}.{{CMD_20}} {{CMD_21}}{{MATH_22}} is the instantaneous rate of change of the altitude at {{MATH_23}}.{{CMD_24}} {{CMD_25}}{{MATH_26}} is the slope of the secant line passing through {{MATH_27}} and {{MATH_28}}.{{CMD_29}} {{CMD_30}}