For sake of convenience, reverse the series, then it would be:
21,19,17.....7
a=21, d = -2,
s(4) = 4/2 (21+15)
s(4)=2(36)
s(4) = 72
Answer:
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Step-by-step explanation:
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3 1/2
0.45 x 12.6= X
X= 5.67