Use the distributive property to expand the following expression. -2(2.1x + 3y - 1.8)

The distributive property is like
-a(b + c - d) = (-a)(b) + (-a)(c) + (-)

so in this case (remember the negatives)
-2(2.1x + 3y - 1.8)
becomes
(-2)(2.1x) + (-2)(3y) + (-.8)

and simplifies to
-4.2x - 6y + 3.8

Next step 4.2x+6y-3.6 
not sure if thats the final answer

The internet will you