**Answer:**

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.

**Answer:**

-12a2 + 9a - 5

**Step-by-step explanation:**

the 2 should be small

You would need to add 36 to both sides to complete the square.

This is because you take half of the x term and then square it.

Answer:

C ≈ 69.12

Step-by-step explanation:

TO change a percent into a decimal, you have to move the decimal two places to the left. Therefore, the answer is 0.0042.