Solve the equation for:
x: 2+5+8+...+x= 155
Answers
Answered by
1
Answer:
X=10
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Answered by
3
Answer:
29
Step-by-step explanation:
2 + 5 + 8 + . . . . . . + x = 155
a = 2, d = 5 - 2 = 3, Sₙ = 155, n = ?, x = ?
Sₙ = (2a + (n - 1)d)
155 = (4 + 3n - 3)
solving the equation we will get n = 10 and n =
Rejecting n = ; we will have n = 10
Now,
Sₙ = (a + l)
155 = (2 + x)
solving the equation we will get x = 29.
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