HELP!!!PLEES!!!!! 10 балов!

Question

HELP!!!PLEES!!!!! 10 балов!

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Answer 1

0,6+1,4:0,5=0,6+2,8=3,4

7y+0,25y+y=84,15
8,25y=84,15
y=84,15/8,25
y=10,2

(y+1,05)*20,1=209,04
y+1,05=209,04/20,1
y+1,05=10,4
y=10,4-1,05
y=9,35