Amarine manufacturer will sell n(x) power boats after spending $x thousand on advertising, as given by upper n (x )equals 970 minus startfraction 3 comma 780 over x endfractionn(x)=970− 3,780 x, 5 less than or equals x less than or equals 305≤x≤30. (a) find upper n prime (x )n′(x). (b) find upper n prime (10 )n′(10) and upper n prime (20 )n′(20). write a brief verbal interpretation of these results.