Multiple choice

What is the 7th term of the sequence 9.9, 6.4, 2.9,...?

  1. 11.1

  2. 10.3

  3. -11.1

  4. -16.3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is an arithmetic progression with the first term a = 9.9 and common difference d = 6.4 - 9.9 = -3.5. The n-th term is a + (n-1)d. For n = 7, the term is 9.9 + (6 * -3.5) = 9.9 - 21 = -11.1.

AI explanation

The sequence follows an arithmetic progression where the first term a is 9.9 and the common difference d is -3.5. Using the arithmetic progression formula for the nth term, a + (n - 1)d, we calculate the 7th term. Substituting the values gives 9.9 + (7 - 1)(-3.5), which simplifies to 9.9 - 21, yielding -11.1.

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