(-1/2)(4x)(-2)(7y)(-1)=?

(-1/2)(4x)(-2)(7y)(-1)=

=(-1/2)(4)(-2)(7)(-1)xy

=-2*-2*7*-1xy

=4*7*-1xy

=-28xy

First, you need to find what x and y equal. Once you find that, insert * between each set of parentheses ()*()*().

You can then enter everything on the calculator that has been generously provided for us on this wonderful forum. 

Oh hey Relic!  Where have you been??

Doing schoolwork. I find that if I get caught up in answering all of these questions, it takes longer to finish my work lol, so I took a break. I won't be on here for long.

But how do I find the x/y thing?(so confused right now??????)

Oh okay.  Whatever you need

I believe whatever book you are using should tell you.