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vampirchik [111]
3 years ago
5

Ida paid 75¢ for two iteams and got 19¢ in change. What iteams did she buy

Mathematics
2 answers:
qaws [65]3 years ago
5 0
You could buy the Magnet and the Postcard and get 19 cents!
Ronch [10]3 years ago
3 0
She brought the magnets i think
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Answer:

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Step-by-step explanation:

Let r be the radius of cone and h be the height of cone

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V=\frac{1}{3}\pi r^2 h

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\frac{dV}{dt}=\frac{1}{3}\pi (2rh\frac{dr}{dt}+r^2\frac{dh}{dt})

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\frac{dV}{dt}=\frac{1}{3}\pi(2\times 10\times 20\times 2+(10)^2\times (-4))

\frac{dV}{dt}=\frac{1}{3}\pi(400)=\frac{400}{3}\pi in^3/s

Hence, the volume of cone changing at rate \frac{400}{3}\pi in^3/s

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Step-by-step explanation:

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