4 * 10 to the 3rd t power equals 28

what is your question?

Step-by-step explanation:

Aploto of the data seems to show it has two periods of variation. on is about length 12, and the other is about length 2. thus it is hard to say the data is "not periodic."of the choices offered, the best correlation is with the last one:   periodic with a period of 12 and an amplitude of about 12.5