Answer
a) 46 hours
b) h increases by 1.5, s increases by 1
c) 5
Work Step by Step
4 songs require 6 hours. 9 songs means 5 more rows in the table. With each new row, h increases by 1.5
Therefore:
$ 6\times1.5^{5}=45.56 \approx 46$ hours
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