Which of the following expressions represents the width of the door? a-(3x+6)- x-x
B-(4x+1)-(3x-6)
C-(3x+6)+(4x-1) + x + x
D-(4x-1)- x-x

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.