Are the 63x and the y being added or multiplied?
Let us say that this number is n
Then we could say:
<em><u>n - 9</u></em>
Use this chart, every way it can add up to ten: i.e. 5,5 6,4...
A = (45/360)×16^2×pi
A = 32pi
To convert to decimal divide by 100. 85/100=0.85. You may want to simplify the fraction which is 17/20
