anonymous
  • anonymous
Oil spilled from a ruptured tanker is spreading in a circular pattern. If the radius of the circle is increasing at the constant rate of 1.5 feet per second, how fast is the area of the spill increasing when the radius of the spill is 42 feet?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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goformit100
  • goformit100
use speed time formula...
anonymous
  • anonymous
I've never heard of that.
anonymous
  • anonymous
related rates right?

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anonymous
  • anonymous
Yeah, related rates.
anonymous
  • anonymous
\(A=\pi r^2\) and so \(A'=2\pi rr'\)
anonymous
  • anonymous
you are told \(r'=1.5\) and \(r=42\) plug in the numbers and get \(A'\) in one step
anonymous
  • anonymous
wow, that was easy. I'm terrible at these.
goformit100
  • goformit100
@bloodrain
anonymous
  • anonymous
yeah, i have to admit that one was real easy they get harder
anonymous
  • anonymous
:(
anonymous
  • anonymous
well only the formulas get harder to figure out, i am willing to bet that you knew the formula for the area of a circle
anonymous
  • anonymous
yeah, I was just thinking like A=pi(r^t/1.5)^2 then I was super confused
anonymous
  • anonymous
That made absolutely no sense to me.
anonymous
  • anonymous
The minute hand on a watch is 8mm long and the hour hand is 4 mm long. How fast is the distance between the tips of the hands changing at one o'clock? THat's the hardest one I have done myself.

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