please help me with this very hard question. Determine if each pair of expressions is equivalent. Mark all equivalent expressions.


Determine if each pair of expressions is equivalent. Mark all equivalent expressions.


4\left(3m+9-7\right)4(3m+9−7) and 6\left(2m+5-3\right)6(2m+5−3)

12z-3\left(z+5\right)12z−3(z+5) and 19+11z+2\left(-2-z\right)19+11z+2(−2−z)

5x\left(8-4y\right)5x(8−4y) and 2\left(12x-10xy\right)+16x2(12x−10xy)+16x

6-7\left(4k+2\right)6−7(4k+2) and -2\left(k+1\right)−2(k+1)