Simplify expression: 1) 8kh-(the 3rd +1) (the 5th +1) 2) and (and-3)+ (and +1) (and +4) 3) (at +2) (at +3) - at (at-1) 4) (with +2) with - (with +3) (with-3)

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1) 8 x-(3x+1) (5x+1) 8x-15x²-3x-5x-1=-15x²-1 2) a(a-3)+ (a+1) (a+4) of a²-3a+a²+4a+a+4=2a+4=2(a+2) 3) (at +2) (at +3) - at (at-1) y²+3y+2y+6-y²+y = 6y+6 = 6 (y+1) 4) (with +2) with - (with +3) (with-3) = with²+2c-c²+9=2c+9
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Answer add