Someone me , i can't figure this out

Arithmetic sequencesu find the next term by adding
geometric sequenceu find the next term by multiplying

sequence 1 : arithmetic...common difference is -16
32 + (-16) = 16
16 + (-16) = 0
0 + (-16) = -16

sequence 2 : geometric...common ratio is 1/2
32 * 1/2 = 16
16 * 1/2 = 8
8 * 1/2 = 4