Is the absolute value of -8.3, 8.3?

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru