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jarptica [38.1K]
3 years ago
5

(1 point) A rock is thrown into a still pond and causes a circular ripple. If the radius of the ripple is increasing at a rate o

f 4 feet per second, how fast is the circumference changing when the radius is 18 feet?
Mathematics
1 answer:
PtichkaEL [24]3 years ago
8 0

Answer:

8pi feet per second

Or, 25.1 feet per second (3 sf)

Step-by-step explanation:

C = 2pi×r

dC/dr = 2pi

dC/dt = dC/dr × dr/dt

= 2pi × 4 = 8pi feet per second

dC/dt = 25.1327412287

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Cell Phone Company A charges $20 each month plus $0.03 per text. Cell Phone Company B charges $5 each month plus $0.07 per text.
Ymorist [56]
Cost of company A=monthlyfee+text=20+0.03t where t=number of texts
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c=20+0.03t
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3 years ago
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Step-by-step explanation:

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62, 68, 68, 68, 69, 70, 70, 72, 72, 72, 75, 75, 76, 78, 78, 80, 80, 80, 85, 86, 86, 86, 88, 88, 88, 88, 89, 89, 89, 89

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The median for Week 2 is more than the median for Week 1.

The mean for Week 2 is more than the mean for Week 1.

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