C=0.2x^2-92x+11,165 what is the minimum daily cost?

You will need to use formula x= -b/2a because the min value will by the vertex of function. 
x= -(-92/(2*.2)) = 230
then plug in x value

C=0.2(230)^2-92(230)+11,165= 585

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.