What is the value of x when the richter scale rating is 3.4

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

What term makes it inconsistent y=2x - 4 ?