Answer: -8.1
Explanation:
This is as simple as plugging in the values. 2 things to keep in mind though are that because x and y are next to each other like that it means they are multiplied (x*y). Also keep in mind that because the answer has - of a negative number that number will become positive. (2.5)(-5.8) - (-6.4) = (-14.5) + 6.4 = -8.1.
Hope this helps!