1. which expression is equivalent to a+(c+7) 1. 7ac 2. a-(c+7) 3. (c+7) -a 4. ( a + c) +7 2 which expression is equivalent to x+11 1. 11x 2. 11+x 3. 11-x 4. -x+11 3. which expression is equivalent to mn+z 1. nm+n 2. z+mz 3. mz+n 4, z+nm 4. which expression is equivalent to ( x y ) z 1. ( x +y )+z 2. 2z(xy) 3. x (yz) 4. x (y+z)