If they give you the total price and the price after the discount you can use this "formula" to solve it p/100=b/a where p is the percentage, a is the total price and b is the price after the discount.
Answer:11
Step-by-step explanation:8+5+2+3=18 5+2=7 18-7=11
Because 3 is a number and the x is unknow so its just an exponent the x ^ 3 grows three each time
The answer would be x-8/x+3, thus option C.