Answer:
x=18/4.5=4
Step-by-step explanation:
Divide both sides by 4.5
(÷4.5)4.5x=18(÷4.5)
x=18÷4.5=4
4
Your answer is right. The sequence has a pattern of -4 every time, so it's A
D
x²=9
x=3; -3
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