3) -4m-15n+3m +18n; 4) -2(x-3)+4(x+1).​

Ответ:

3) Combine like terms:

-4m + 3m - 15n + 18n

= -m + 3n

Therefore, the simplified expression is -m + 3n.

4) Distribute the negative sign:

-2x + 6 + 4x + 4

Combine like terms:

2x + 10

Therefore, the simplified expression is 2x + 10.

Ответ:

Пошаговое объяснение: