?What is the average velocity over the following intervals $?$

x (m) 16 14 12 20 10 8 6 4 2 -2 -4 -6 -8 (a) 0 to 2.00 s (b) 0 to 4.00 s 1 m/s m/s (c) 2.00 s to 4.00 s m/s (d) 4.00 s to 7.00 s m/s 2 3 4 5 6 7 /8 t (s) i