We saw above that
R(t+h)
-
R(t) = 500h
-
200th
-
100h
2
Dividing by h now gives
R(t+h)
-
R(t)
h
=
500h
-
200th
-
100h
2
h
=
500
-
200t
-
100h
Enter this as
500-200*t-100*h
or
500-200t-100h
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