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  • 11-12-2017
  • Mathematics
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write the arithmetic sequence that has four arithmetic means between -20 and 20.

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Аноним Аноним
  • 11-12-2017
let the  terms be 

a , a+d, a+2d, a+3d, a+4d a + 5d

so a = -20
and  a + 5d = 20

-20 + 5d = 20
5d = 40 so
d = 8

-20,-12,-4,4,12,20  is the required sequence.
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