[44-1] exercise designed to appreciate comparative merit of
cp with the same argument below,
[44-1.1] do the 1st proof without using cp; &
[44-1.2] do the 2nd proof by using cp:
c: m -> r
1: ~m v n
2: ~r -> ~n

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: i guess 5 units?

step-by-step explanation:

x< -17/2 hope this