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Please help with this and more, question attached

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Sagot :

AL2006

                                              A = h(b1 + b2) / 2

Multiply each side by  2:         2A = h(b1 + b2)

Divide each side by  'h' :      2A/h  = b1 + b2

Subtract  b2  from each side:   b1 = 2A/h  -  b2