XxKaitlynnxX
01.07.2020 •
Mathematics
Each term in the sequence below is 9 more than 1/3 the previous term. What is the value of y-x?
81, 36, x, y,...
Plz explain
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Ответ:
y - x = - 5
Step-by-step explanation:
Applying the rule gives
x =
× 36 + 9 = 12 + 9 = 21
y =
× 21 + 9 = 7 + 9 = 16
Thus
y - x = 16 - 21 = - 5
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