Which of these numbers is in the solution set of x + 3 = 12? A. 15 B. 4 C. 9 D. 10

C. 9

Step-by-step explanation:

in the equation x + 3 = 12 you can subtract 3 from both sides which would be x = 12 - 3 or x = 9

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

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