Asked by Luke

If a cost of a function is C(x) = (49 ln x) / (28-3x), find the marginal cost when x = 7
Answered by Steve
marginal cost is
dC/dx = 49(-3x+3lnx+28)/(28-3x)^2
so at x=7, dC/dx = (7 + 3 ln7)/49
Answered by mosallam
a ship sails 6 kg on a bearing 160• and then a further 10 kg on a bearing 240 as shown how far this ship from starting this point
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