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Posted by **Joe** on Tuesday, July 12, 2011 at 7:11pm.

- Calculus -
**Damon**, Tuesday, July 12, 2011 at 7:17pmA = .5 b h

so

87,000 = .5 b (9500)

b = 18.32

then calculus

dA/dt = .5 (b dh/dt + h db/dt)

1500 = .5 ( 18.32 * 3000 + 9500 * db/dt)

- Calculus -
**Reiny**, Tuesday, July 12, 2011 at 7:22pmstrange .....

http://www.jiskha.com/display.cgi?id=1310504428

- Calculus -
**Joe**, Tuesday, July 12, 2011 at 7:24pm-13.67?? ...

- Calculus -
**Damon**, Tuesday, July 12, 2011 at 7:33pmI got -5.47

If the base were constant the area would be increasing faster than 1500cm^2/min due to the rapid altitude increase. Therefore the base must be decreasing.

- Calculus -
**Joe**, Tuesday, July 12, 2011 at 7:36pmpositive 5.47

- Calculus -
**Damon**, Tuesday, July 12, 2011 at 8:11pm1500 = .5 ( 18.32 * 3000 + 9500 * db/dt)

3000 = 54960 + 9500 db/dt

9500 db/dt = -51,960

db/dt = -5.47

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