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Kryger [21]
3 years ago
7

Please help me right away.

Mathematics
1 answer:
8090 [49]3 years ago
6 0

\dfrac{D(t)}{R(t)}=\dfrac{400-120t}{450-150t}=\dfrac{10(40-12t)}{10(45-15t)}=\dfrac{40-12t}{45-15t}\to\boxed{a.}

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