3 years ago

Please help me right away.

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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