Because of the theorem that states the vertically opposite angles are equal, we can look at the opposite angle in this problem to find the answer. In this case, we can see that the opposite angle is 163, so y = 163.
Since she bought 4 bags of 50 beads and 3 bags of 200 beads you only need to use two operations: multiply and add.
4 x 50 is 200
3 x 200 is 600
600 + 200 = 800
Mariah purchase 800 beads in total.
