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NEED HELP!!!!!!!!!!!!!!!!!!!!!
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1 vote
NEED HELP!!!!!!!!!!!!!!!!!!!!!

NEED HELP!!!!!!!!!!!!!!!!!!!!!-example-1
User CHarris
by
8.4k points

1 Answer

4 votes

Answer:-602

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

User Bitcodr
by
8.1k points
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