Answer:
$52
Step-by-step explanation:
3 books → $13
1 book → $13/3
12 books → $13/3 x 12 = $52
8
378-36-270=9x
72=9x
72÷9=9x÷9
8=x
X=8
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13 m
volume=1/2(b×h)×length/height
height =volume÷base area(1/2b×h)
832÷64=13m
minus 6 on both sides and then reduce down