11. tell whether the sequence is arithmetic. if it is, what is the common difference?
19, 12.5, -2
no
yes: 1/7
yes; 7
yes; -7

No.

Step-by-step explanation:

19 - 12.5 = 6.5

12.5 - (-2) = 14.5

The differences between two pairs of consecutive numbers of the sequence are not equal, so there is no common difference, and the sequence is not arithmetic.

Step-by-step explanation:

The given sequence is

The given sequence is not arithmetic, because there's no difference pattern. For example, the difference between 12.5 and 19 is -6.5, and the difference between 12.5 and -2 is 14.5, therefore it's not an arithmetic sequence, because they difference is not the same for all terms.

Therefore, the answer is the first choice NO.

$450

step-by-step explanation:

first, you have to multiply 150x2=300

next, you have to add 150+300= 450

a negative exponent is translated as follows:

so, we have