Simplify
1. 7x + 11x
2. 3x-2y+4z-2x-3y+5z+6x+2y-3x

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters