math, please help!!!!

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Let t be time in seconds and let r(t) be the rate, in gallons per second, that water enters a reservoir:
r(t)=700−40t.

a) For 0≤t≤30, when does the reservoir have the most water?
b) For 0≤t≤30, when does the reservoir have the least water

  • math, please help!!!! -

    Already answered. See your previous post.

  • math, please help!!!! -

    im trying to look for this too

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