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October 20, 2014

October 20, 2014

Posted by **Anonymous** on Friday, April 10, 2009 at 4:59pm.

how should I start this?

- calculus -
**Reiny**, Friday, April 10, 2009 at 5:10pmI visualize a circle with radius 6400 and the ship at a point P.

let the eyes of the lifeguard be Q.

then Q is 6400.004 km from the centre of our earth circle.

let PQ = x

x^2 + 6400^2 = 6400.004^2

I got x = appr. 7.155 km

- calculus -
**Anonymous**, Saturday, April 11, 2009 at 8:50pmthe answer is suppose to be 2675.3

..

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