Rachel G.

asked • 01/06/19

Counting backwards

Becky is counting backwards from 18.5. Identify the pattern she is using and complete the sequences of numbers.


18.5 , 17.25 , 16

1 Expert Answer

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David W. answered • 01/06/19

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This is an Arithmetic Sequence and the "distance" d = -1.25.


a1 = 18.5

a2 = a1` - 1.25 = 17.25

a3 = a2 - 1.25 = 16

Complete the Sequence:

a4 =              14.75

a5 =              13.5

a6 =              12.25

a7 =              11

a8 =              9.75

a9 =              8.5

a10 =              7.25

a11 =              6

a12 =              4.75

a13 =              3.5

a14 =              2.25

a15 =              1

a16 =              -0.25

a17 =              -1.5

a18 =              -2.75

. . .


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