#### Answer

$1.84$ quadrillion.

#### Work Step by Step

The total Btu provided by the renewable energy sources is 8 quadrillion.
Biofuels provided $23$% of this total:
Biofuels contributed $8\times0.23=1.84$ quadrillion BTU.

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

$1.84$ quadrillion.

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