Thread: MathCAD 14 Integral wont solve

i require integral performed in mathcad 14 can mathcad give me answer. below code
d:= 4
v:= 20
lamda:=25
e(x):= 6.256*10.x^3.v^2.d
ae:= 4pi(6371000^2)
rd(x):=lamda.(cube root e(x))
ad(x):= pi(rd(x)^2)
fe(x):= 1/(10^(2log(x)-1))
fk(x):= integral (50 1500) fe(x).ad(x)/ ae dx
if can explain why mathcad give answer without doing integral , showing me how obtain correct answer appreciated. thank you

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