De=x+10, cd=6,cd=6, and ce=3x, ce=3x, determine the numerical length of \overline{de}. de .

1. CD = 6, DE = x + 10, CE = 3x    1. given

2.    CD + DE = CE                        2. segment addition postulate

3. 6 + (x + 10) = 3x                         3. substitution

4.         x + 16 = 3x                         4. simplify (add like terms)

5.               16 = 2x                         5. subtraction property  of equality

6.               8 = x                             6. division property of equality

DE = x + 10

    = (8) + 10

    = 18

DE = 18

phosphate, calcium ion, chloride ion, neon atom

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