Please tolong sama caranya

7. -2,4.-8, 16
rasio nya adalah -2 karna -2×-2 =4, 4×-2=-8, -8×-2=16

9. 4, 7, 10 bedanya 3
un= a+(n-1)b
=4+(n-1) 3
=4+3n-3
=3n+1
U15= 3n +1
=3.15 +1
=45+1
=46
maaf cuman tau yg nomer 7 sm 9 aja hehehe