I thank it is B you have to add all the tickets and times that by the the amount of money
The answer is 30 because u need to add 60+90=150 and then subtract 180-150 which gives you 30
-21x^3 - 8x^3 = -29x^3
-7/4x^(1/2) - 0 = -7/4x^(1/2)
-6x^(1/4)
-12x^(-1/2)
12x^(-1/4)
14x^4
Therefore, the correct option is the 2nd one.