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cupoosta [38]
3 years ago
14

NEED HELP!!!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
Aleks [24]3 years ago
5 0

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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7 0
3 years ago
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sergiy2304 [10]

Answer:

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Step-by-step explanation:

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4 0
3 years ago
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6 0
3 years ago
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Ans. D

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