If a log has no base written, you should generally (in algebra classes) assume that the base is 10
we raise 10 to the power log 57.9/c = 57.9/c
and 10 to the power 0.293 = 1.9633602768
so 57.9/c = 1.96
c = 57.9 /1.96 = 29.5
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