Answer:
17•15+(15+14)-11•16÷12= 269.3
(34+33)15-1+13-1+10= 1026
(1+4)÷20•17-31= -26.75
I don't know if this is right but I think its C.
Humans had not learned to write during the prehistoric time period. ... There are three theories that the prehistoric man might have painted animals on the walls. (hope that helps have a good night:)