6)15(5.4+3.5z)-11z-6 7)16.7x+0.5*(-1.4x) 8)2a(1/4-5b)+2/3a 9)-2.6(5-c)-c+8 10)2(3x--2y)

6)15(5.4+3.5z)-11z-6= 15*5,4+15*3,5z-11z-6=81+52.5z-11z-6=(52.5z-11z)+ 81-6=41.5z+75

7)16.7x+0.5*(-1.4x)=16.7x-0.7x=16x

8)2a(1/4-5b)+2/3a=2a*1/4-2a*5b+2/3a=1/2a-10ab+2/3a=(1/2a+2/3a)-10ab=
7/6a - 10 b

9)-2.6(5-c)-c+8= - 2.6*5 - (-2.6)*c +8= -13 + 8 +2.6c=2.6c-5

10)2(3x-y)-(5x-2y)= 2*3x-2y -5x+2y=6x-5x-2y+2y=x