What is the area of a circle with a diameter of 16?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

How do you solve a question like this?