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× What are Sound Waves? $225.00
$225.00
× What is the Center of Gravity? $225.00
$225.00
× What is the Law of Inertia? $225.00
$225.00
× How do String Instruments Conduct Sound? $225.00
$225.00
× What is the Moon? $225.00
$225.00

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Subtotal $1,125.00
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Total $1,237.50