A. log381 is the same as saying 3x = 81, so x = 4.
log10100 = 2, since 102 = 100.
log93 = 1/2, since the square root of 9 is 3.
A.
6.
8.
11. Use concentric circles of x and 4x radii. If a dart lands randomly
in the large circle, find the probability it will land
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