Which of the following statement is not true? * (a) 4 : 7 = 5 : 9 (b) 5 : 25 = 12 : 60 (c) 30 : 80 = 6 : 16 (d) 12 : 36 = 14 : 42​

a) 4:7 = 5:9 , there value is not equal

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