Help, please! The sixth class of 10 points of the Mathematician of the PHOTO THANKS A LOT

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No. 2 a) x-4.8 =-1.6 x =-1.6+4.8 x=3.2 b) 1.5-y =-3.2 - y =-3.2-1.5 y=3.2+1.5 y=4.7 c) - a/0.8=1.25 - a=1.25*0.8 a =-1 d)-3/5 * b=1/15 - b = 1/15*5/3 b =-1/9 No. 3 a)-21/8*4/7 + (-8.7+2.3)/0.8 + 20/9*6/10 =-3/2 - 64/10*10/8 +4/3 =-1.5-8+4/3 = - 9 3/6+8/6 = - 9+1 - 3/6+2/6 =-8 - 1/6 =-8 1/6 b) 1 action) 20/3*42/10*9/100 = 63/25 2nd action)-56/10*25/8*12/10 =-105/2 3rd action) (63/25) / (-105/2) =-6/125 No. 4 (-8.3+7.9) *-1 5/7 / - 0.6 = 4/10*12/7*6/10 = 72/175 hogwash turned out, but I tried
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Answer add