Question

Answer 1

`a)D=[5^2]/[1.6]+[5^2]/[6.11]+...+[5^2]/[26.31]`

`D=5(5/[1.6]+5/[6.11]+...+5/[26.31])`

`D=5(1-1/6+1/6-1/11+....+1/26-1/31)`

`D=5.(1-1/31)`

`D=5. 30/31=150/31`

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`b)K=4/[11.16]+4/[16.21]+4/[21.26]+...+4/[61.66]`

`K=4/5(5/[11.16]+5/[16.21]+5/[21.26]+...+5/[61.66])`

`K=4/5(1/11-1/16+1/16-1/21+...+1/61-1/66)`

`K=4/5(1/11-1/66)`

`K=4/5 . 5/66`

`K=2/33`