The table below shows the altitude of a space shuttle Time (s) Altitude (ft) 0 7 10 938 20 4,160 30 9,872 40 17,635 50 26,969 60 37,746 70 50,548 80 66,033 90 83,966 100 103,911 110 125,512 120 147,411 What is the average rate of change, in feet per second, of the shuttle from 30 seconds? (1) 37,746 (3) 464.6