The temperature rises 15 degrees Fahrenheit Syntax error. and then drops by Syntax error. If the temperature started at minus 11 degree straight F comma what temperature change would be required to bring the temperature to Syntax error.

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Math it's appreciated. (picture provided)

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.