Answer: 562.5
Step-by-step explanation:
Ok...Im <em>PRETTY </em>sure this is right, because you multiply 5 (5 years till 2025) times 7.5 (the rate of decrease in price) and subtract that from 500, so that would be 600-37.5, which gives you 562.5
Yeah, it is 16, the way they worked it out is correct also
Given the figure of a cyclic quadrilateral
The sum of the opposite angles = 180
so, we can write the following equations:

we will find (x) from equation (1):
x = 180 - 100 = 80
We will find (y) from equation (2):
2y = 180 - 102
2y = 78
y=78/2 = 39
So, the answer will be:
x = 80
y = 39