Math

1. The sequence log2 32, log2 y, log2 128, ... forms an arithmetic sequence. What is the value of y?

2. If log a^2 b^3 = x and log (a/b) = y, what are the values of log a and log b?

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asked by Lily
  1. 128/32 = r^2
    r=2, so y=32*2=64
    Or, evaluate the logs. The sequence is thus
    5,log2(y),7
    so, log2(y) = 6, and y=64

    log a^2b^3 = 2loga + 3logb
    log a/b = loga - logb

    2loga + 3logb = x
    loga - logb = y

    2loga + 3logb = x
    2loga - 2logb = 2y
    5logb = x-2y
    logb = (x-2y)/5

    solve for loga in like wise.

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    posted by Steve

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