When x = 2e, is ?

a.
b. 1
c. ln(2e)
d. nonexistant

Supposing you know about the derivative, notice that

so that when , the limit is equal to and the answer is A.

when x = 2e

So , correct option is (A) 1/2e .

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since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m