Evaluate the expression when x= -3 X^2+8x-7

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

h is the x-coordinate of the vertex

step-by-step explanation:

we have

in this function

the point represent the vertex of the function

so

h is the x-coordinate of the vertex

k is the y-coordinate of the vertex