Which of the sequences is an arithmetic sequence?

A

Step-by-step explanation:

Arithmetic sequences are those that have a common difference, as opposed to having a common ratio or no common difference at all.

Look at each answer choice:

A: Find the common difference by taking one term and subtracting the previous term from it.

-27 - (-20) = -27 + 20 = -7

-34 - (-27) = -34 + 27 = -7

If we keep doing this, we'll see that they all have a difference of -7, so this is an arithmetic sequence.

If we inspect the other three answer choices, we'll see that they do not have common differences.

Thus, A is the answer.

A -20, -27, -34, -41,-48

Step-by-step explanation:

An arithmetic sequence is  one that has the same thing added or subtracted each time

A -20, -27, -34, -41,-48

We subtract 7 each time

B 154,71,8,5,2

There is not constant number that we add or subtract

C 1,5,10,15,20

It looks like we add 5, but from the first to second term, we only add 4, so it is not an arithmetic sequence

D 12,-24,36,-48,60

We are multiplying not adding or subtracting so this is geometric

median is the value separating the higher half of a data sample, a population or probablity distribution from the lower half.

step-by-step explanation:

say you have 3,8,7,3,1,9,8 order them from lowest to highest

if orderd it would be 1,3,3,7,8,8,9 now you take away from the lowest and the highest until you end up in the middle.

so you would remove the 1 and 9 leaving you with 5 digits remaining

when you've reached the middle that would be your answer so in this case the answer is 7

if there were two numbers left say 7 and 5 you'd and them together so 12 then divide by 2 witch would equal 6 so the answer would be 6

good luck on that project hoped i you at all

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be