-1.8c + 5.1d plug the numbers in that you were given.
-1.8(2.9) + 5.1(-4.2)
Multiply the first and second group of numbers
-1.8 x 2.9 = - 5.22
5.1 x -4.2 = - 21.42
Now add the two numbers together but remember they are both negative numbers. So when you add them together, it will end up being a more negative number.
