("xz" ) ̅ is a common external tangent to circles w and y. what is the distance between the two centers of the circles? round to the nearest hundredth. (hint: draw segment ("wy" ) ̅ connecting the centers of the two circles, and then draw a segment, ("ws" ) ̅, so that ys + sz = yz and ("ws" ) ̅ ⊥ ("yz" ).

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answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.