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Please help me right away.
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Please help me right away.

Please help me right away.-example-1
User Rory Blyth
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(D(t))/(R(t))=(400-120t)/(450-150t)=(10(40-12t))/(10(45-15t))=(40-12t)/(45-15t)\to\boxed{a.}

User Brayn
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