Suppose the total cost in dollars of manufacturing m of a commodity is expressed by the function:

$\displaystyle {C}{\left({m}\right)}={m}^{{3}}-{10}{m}^{{2}}+{400}{m}-{500}$ 

(i)  The the cost of manufacturing $\displaystyle {65}$   units of this commodity will be < dollars. 

(ii)  The average cost of manufacturing $\displaystyle {65}$  units of this commodity, to the nearest whole cent, will be i dollars.

(iii)  The cost of manufacturing just the $\displaystyle {65}^{{t}}{h}$  unit will be n dollars. 

65^3+-10*65^2+400*65+-500=257875>0

d=65>-10=a