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y=6x+0, or just y=6x

Step-by-step explanation:

The slope in rise over run form is 6/1 as you move up 6 digits on the graph and over 1 digit before you intersect at the next point (1, 6). 6/1 can be simplified to just 6, and the y-intercept is 0 so you can leave it off of the equation. This gives you the equation in slope-intercept form y=6x.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)