Help me with this problem ASAP, which are true?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

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

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?