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:
b and d/ a and c
Step-by-step explanation:
Nothing on the rectangle is shaded, unless the camera quality is poor.
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