The angle between two lines, $$2y+x=3$$ and $$5y+x=3$$, is most closely:

A. $$20^(circ)$$

B. $$18^(circ)$$

C. $$15^(circ)$$

D. $$14^(circ)$$

Three lines are defined by the three equations:

$$x+y=0$$

$$2x-y=0$$

$$x+2y=2$$

The three lines form a triangle with vertices at:

The equation of a sphere with center at (-3, 2, 5) and a radius of 6 is:

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