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PolarNik [594]
3 years ago
15

Form a sequence that has two arithmetic means between -13 and 89.

Mathematics
2 answers:
scoray [572]3 years ago
8 0
It would be D. If you add all the numbers (-18, -81, 144) and divide it by 3 then you would get -81. I hope I helped!
goldenfox [79]3 years ago
4 0
Compare the problem statement to the answer choices. (Check the offered answers.) Only the first two sequences start with -13 and end with 89, so selections (b) and (d) can be rejected. The differences between terms of sequence (a) are not constant, so it is not an arithmetic seqence. That only leaves ...
  c. -13, 21, 55, 89
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Answer:

Noah did not make any error

Step-by-step explanation:

The median of a list of strictly increasing numbers is simply the middle number. If there's an even number of numbers in the list, then the median is the average of the middle two terms.

Here, the numbers are 115, 109, 117, 136, 127, 131. When ordered from least to greatest, we get: 109, 115, 117, 127, 131, and 136, which is what Noah got.

Since there are 6 numbers (6 is even), the median will be the average of the middle two numbers, which are 117 and 127: (117 + 127)/2 = 244/2 = 122

So, Noah was correct.

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Step-by-step explanation:

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Step-by-step explanation:

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So we need the height of the triangle, or the missing side.

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