exam Maths Puzzle Numerical Ability

3(1+d)-5=3d-2

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hey i wanna now to resolve -(0.5+0.2)-6+(-0.3)) State the common ratio and determine the next three terms for the geometric sequence 2, -8, 32, -128
Common ratio = (-4)
Next three terms = 512, -2,048, 8,192
Thank you in advance.