I WILL GIVE 1: AB + BC = AC, because 25 + 144 = 169
2: (AB)^2 + (BC) = (AC)^2, because 13^2 + 5^2 = 12^2
3: AB + BC = AC, because 13^2 + 5^2 = 12^2
4: (AB)^2 + (BC)^2 = (AC)^2, because 25 + 144 = 169

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

answer: 177/8

step-by-step explanation:

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step-by-step explanation: