Usually, "simplify" means to remove any common factors and express the sum as a single fraction, often in multiplie-out form.
If you factor what you've got, you will write it as
The standard equation of the circle is:
(x-h)^2+(y-k)^2=r^2 where (h,k) it the center of the circle and r is the radius...
so
30.
(x-2)^2+(y-7)^2=16
31.
We need to find the radius...(I'll just use the Pythagorean Theorem)
r^2=6^2+8^2
r^2=36+64
r^2=100 (so the radius is 10) and its center is (-6,-8) so
(x+6)^2+(y+8)^2=100
pi + -pi = 0 0 is a rational number
Choice D
<em>1</em>×<em>4+1=5
2</em>×<em>5+2=12
3</em>×<em>6+3=21
So, 8</em>×<em>11+8=96</em>