You would multiply the students by the price (12*10=120) then multiply chaperones by price (6*15=90) then add both prices together to get 210. Then you would subtract 210 from 380 to get how many boys are in the class. 380-210=170. Since each student cost 10 so you would divide 170/10=17. There would be 17 boys in your class.
Answer:
The option on the top left
Step-by-step explanation:
As the equation is 
We know that the circle will have a radius of 4 and will be shifted 4 units up
Your answer would be 600 because 696-600=96
I want to say C but the gut inside me is saying B