Question

Answer these questions correctly with the explanations, I will mark you as a brainlist.
​

Answer 1

$3x + ( - 5x) + 7x = 3x + 7x - 5x = 10x - 5x = 5x$

$7xy + 2xy + ( - 8xy) = 9xy - 8xy = xy$

$( - 2abc) + 3abc + abc = 2abc$

$3mn + ( - 5mn) + 8mn + ( - 4mn) = 11mn - ( + 9mn) = 2mn$

$3 {x}^{3} + 3 {x}^{3} + ( - 4 {x}^{3} - 5 {x}^{3} ) = 6 {x}^{3} - 9 {x}^{3} = - 3 {x}^{3}$

please mark as brainliest as it has taken me a lot of time to do this