Explain why the maximum distance happens at the same x -value(s) as where the graphs have equal gradients.

​max distance was 12.815 at X = 5/3
had the same gradient at X = -3 and 5/3

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

10 - 75

step-by-step explanation:

there's nothing attached so it's most likely anything in that range.