If a number is besides each other (you'll know because of the brackets), then it means to multiply.
So this question is basically saying: 1.9 x 8.43
You can then use my strategy (which I don't know the name of) to answer this.
1.9 x 8.43 ---(Take away the decimal)---> 19 x 843
Then times the hardest number with the easiest one. (I'm rounding so it's easier)
843 x 20 = 1686
1686 - 84.3 = 1601.7 = 843 x 19
Then, however decimal places there was, add it to the answer.
1.9 x 8.43 has 3 decimal places, so,
16.017 is the answer.