Answer:
-279.63
Step-by-step explanation:
Plug in 1 for n and solve, then plug in 2, and so on until you get to 3(6)-1=17
Its like ones true then ones false it goes in that pattern
Well the answer i got was

when i multiplied
the answer i got when i added was
19. 60* - a straight line is 180* - the other side which is 120* (supplementary)
20. 132* - the angle below is the same as the other side of this angle, 180* - 48* (same side interior angles)
21. 48* - these are the same angle just in different placements (corresponding angles)
22. 70* - same angles just different placement (alternate interior angles)
23. 85* - these are vertical angles so they’re the same
24. 114* - same angle just different placement (alternate exterior angles)