Consider the equation a + b = c - d/2

when solved for each variable. Choose all that are correct.

a = 1/2 (-2b + c - d)

b = 1/2 (-2a + c - d)

c = 2a + 2b + d

d = - 2a - 2b + c

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What adds to - 3 and multiplies to - 54

White the number 876,543,210.25 in expanded notation

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The diameter of a circle is 26 m what is the circles circumference