Question: 18. 28 X 210 = Solve for the specified unknown. 19. ab = cd (Solve for a) 20. 5x + 13 =32 (Solve for x)

18. 28 X 210 = Solve for the specified unknown.
18. 28 X 210 = Solve for the specified unknown. 19. ab = cd (Solve for a) 20. 5x + 13 =32 (Solve for x)

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