Answer: -7.14
Explanation:
PEMDAS is very important for these questions and very important throughout all of math. If you are unaware of what PEMDAS is, it is the order in which we do operations. It goes
Parentheses
Exponents
Multiplication/Division
Addition/Subtraction
In this situation, we have a set of parentheses, therefore we start with that expression.
-2.8+4.5=1.7
Then, a number next to a number in parentheses means you multiply, so then we multiply -4.2 and 1.7 together to get -7.14