isahussain1203 isahussain1203
  • 15-05-2020
  • Mathematics
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NEED HELP!!!!!!!!!!!!!!!!!!!!!

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Chelboy
Chelboy Chelboy
  • 15-05-2020

Answer:-602

Step-by-step explanation:

First term=a=-143

common difference=d=-134-(-143)=9

Using the formula

Sn=n/2(2a+d(n-1))

S28=28/2 (2(-143)+9(28-1))

S28=14(-286+9x27)

S28=14(-286+243)

S28=14(-43)

S28=-602

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