In order to perform the soulution to this problem we must know:
When adding a postitive and a negative together makes it negative.
Now as we look at this problem we can take the + and the - sign and make it a - sign
We now have 1.3(-2.4)
We may get rid of the parentheses and perform this problem by setting up the equation
1.3-2.4
Your answer would be -1.1
I hope this helps