Posted by alexis on Thursday, December 6, 2012 at 12:05am.
what's the problem? you are given a formula and a value. Plug the value into the formula.
d(h) = √(12800 + h^2)
d(4200) = √(12800+4200^2)
= √(12800+17640000)
= √17652800
= 4201
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