Question

HELPPPPP FASTTTTTTTTTT PLEAAAAASE

Answer 1

Answer: Third option.

Step-by-step explanation:

To solve this exercise it is important to remember the following:

1) By definition, equivalent expression have the same value, but they look different.

2) The multiplication of signs:

$(+)(+)=+\\(-)(-)=+\\(-)(+)=-\\(+)(-)=-$

Then, given the following expression provided in the exercise:

$=(8.4x+2.9)+(-3.7x+5)$

You need to distribute the postive sign:

$8.4x+2.9-3.7x+5$

And finally, you must add the like terms:

$=8.4x-3.7x+2.9+5=4.7x+7.9$

As you can notice, the expression obtained matches with the expression shown in the third option.