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rachel63892
24.11.2021 •
SAT
What is the length of XB? 4. 2 cm 4. 6 cm 4. 8 cm 5. 3 cm.
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Ответ:
a = 4, d = 5 - 4 = 1, n = 150
Sn = n/2[2a + (n - 1)d]
S(150) = 150/2[2(4) + (150 - 1)1] = 75[8 + 149] = 75(157) = 11,775