Each of the following functions is a different form of the quartic model for the situation given above. which form would be most if attempting to determine the time at the which the company did not earn any profit?

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)