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Rimon

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If the term is, 3x- y^2 -3+2y^2 +2x -4 =y^2+5x-7 If this is not the answer then there us problem in your question
Force = acceleration x mass = 2.2 x 19.9 = 43.78 N
No its B,D and E
let, bullets mass,m =5 gm = 0.05kg bullet before shot velocity,u = 0m/s bullets velocity,v= 200 m/s guns mass,m'= 20kg before shot,u'=0m/s after shot velocity = v' According to newton mu+m'u' = mv+m'v' now calculate, the velocity will be 0.5m/s
let the time be x Then the first train will go 70x mi other train will go 80x mi As the are passing through opposite direction. then 70x+80x = 600 or, x = 4

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