Hello, Mom (me), needs help please!! I give medals :) The value of the expression -2xy for x = -4.7 and y = 0.2 is _____. Possible answers are:

-18.80
18.80
1.88
-1.88

Thanks so much! :)

Question

Hello, Mom (me), needs help please!! I give medals :)  The value of the expression -2xy for x = -4.7 and y = 0.2 is _____. Possible answers are:

-18.80
  18.80
    1.88
  -1.88 

Thanks so much! :)

lyrae · Answer

In -2xy replace x and y with the value they are equal to.

anonymous · Answer

when i extend it out, i get totally different answer

anonymous · Answer

i did, i think it is the double negative that is throwing me off

lyrae · Answer

When dealing with negative numbers you almost always put parentheses around the negaive numbers.
This will give:
-2*(-4.7)*(0.2) = 1.88

lyrae · Answer

Sorry, that should of course have been
(-2)*(-4.7)*0.2 = 1.88

:P

anonymous · Answer

thank u very much!