Answer:
14. x=30, y=15, z=165
15. x=10, y=25
Step-by-step explanation:
Answer:
500/4=125
Step-by-step explanation:
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the last one because 7*3=21 14*3=42 and 21*3=63
13. 1,6
18. -15,12
19. -7, 1/2
