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texaschic101
  1. N = 7LH....solve for H
          N / 7L = H
    estimate : L = 28..gonna round it to 30, N = 1568..gonna round it to 1570
    1570 / 7(30) = 1570/210 = 7.48..so its about 7 1/2 ft tall. 

    20. D = M/V
          D = 19.3
          M = 96.5
    19.3 = 96.5/V....multiply both sides by V, eliminating V on right side
    19.3V = 96.5 ...divide both sides by 19.3
    V = 96.5 / 19.3
    V = 5 g/cm^3

    21. P = 2L + 2W....solve for w
    subtract 2L from both sides
    P - 2L = 2W
    divide both sides by 2
    (P - 2L)/2 = W or P/2 - 1 = W or 1/2P - 1 = W

    22. -3(m - 2n) = 5m
          -3m + 6n = 5m
           6n = 5m + 3m
           6n = 8m
           6/8n = m
           3/4n = m <==

    EC1. 
    y = 3x + 1......when x = 1 and y = 4...this is correct......but the solution is written as (x,y)...so the solution is (1,4) and NOT (4,1)

    EC2.
    55.20 = 3(5.30g) + 2.50(3)
    55.20 = 15.9g + 7.5
    55.20 - 7.5 = 15.9g
    47.70 = 15.9g
    47.70/15.9 = g
    3 = g.....so they played 3 games
         

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