What is the expanded form of this number?

509.307

(5*100) + (9*1) + (3*110) + (7*11,000)

(5*100) + (9*10) + (3*110) + (7*11,000)

(5*100) + (9*10) + (3*1100) + (7*11,000)

(5*100) + (9*1) + (3*1100) + (7*11,000)

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The center of the circle that can be circumscribed about a scalene triangle is located by constructing the

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2x+3y=12 how do I solve?

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Which graph shows the inequality y<2