C
If you plug in the values in that equation, it works.
If you put 7% into a decimal it would be 0.07
Each person gets about 9.75 ounces of ice cream
(3x+4)+(5x2-1)+(2x+6)
remove unnecessary parenthesis
3x+4+(5x2-1)+(2x+6)
3x+4+(10-1)+2x+6
subtract the numbers
3x+4+9+2x+6
collect the like terms
5x+4+4+9+6
5x+19
