B. (6 * 5) + (4 * 10)
If there are six members that each cost five dollars, then you know a part of the equation is (6 * 5)
Likewise, if there are four non members that each spend ten dollars on tickets, the other part of the equation should be (4 * 10)
Then, to get the total amount of money spent, you would need to add these two mathematical statements together:
(6 * 5) + (4 * 10) is your answer