Tell whether the sequence is arithmetic. if it is, what is the common difference? 19, 12, 5, -2

The common difference in the arithmetic sequence is -7.

Given that,

Sequence; 19, 12, 5, -2

The sequence is arithmetic.

We have to determine,

The common difference of the sequence.

According to the question,

The common difference in the arithmetic progression is given by the following formula;

Common difference = second term - first term

Then,

The common difference between the terms is,

Common difference between first and second term =  12 - 19 = -7

Common difference between second and third term =  5 - 12 = -7

Common difference between third and fourth term =  (-2) - 5 = -7

Therefore, The common difference in the arithmetic sequence is -7.

To know more about Arithmetic Progression click the link given below.

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The sequence is arithmetic.  The sequence is decreasing 7 each time so the common difference is -7

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

55 degrees because 55+55=110 degrees