7-2 Arithmetic sequences practice 3

Which of the following is NOT an arithmetic sequence?

[math]\log{3}, \log{9}, \log{27}, \log{81}[/math]

Correct Incorrect Correct answer

[math]-3,5,-7,9[/math]

Correct Incorrect Correct answer

[math]\{a_n\}=115-7n[/math]

Correct Incorrect Correct answer

[math]-12,-7,-2,3[/math]

Correct Incorrect Correct answer

Find the value of [math]x[/math] such that the sequence [math]25, x, 37[/math] is an arithmetic sequence.

Fill in the blank 1 of 1

The general term of an arithmetic sequence is [math]b_n=9-4n[/math], find the sum of the first 7 terms of the sequence.

Fill in the blank 1 of 1

The [math]4^{\text{th}}[/math] term of an arithmetic sequence [math]a_n[/math] is 3 and the [math]10^{\text{th}}[/math] term is [math]-15[/math].

(a) [math]a_1=[/math]Fill in the blank 1 of 5 , [math]d=[/math]Fill in the blank 2 of 5

(b) [math]a_n=[/math]Fill in the blank 3 of 5 [math]n+[/math]Fill in the blank 4 of 5

(c) [math]S_8=[/math]Fill in the blank 5 of 5 |1]}

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