Hi there! The answer is 2.8x + 8.7
To find the sum of (-2.1x+3.7) and (5+4.9x), we must add both expressions.
(-2.1x+3.7) + (5+4.9x) =
First get rid of the parenthesis, which (now) don't have a function.
-2.1x + 3.7 + 5 + 4.9x =
Rearrange the expression
-2.1x + 4.9x + 3.7 + 5 =
Now I'll add all the variables 'x'.
2.8x + 3.7 + 5 =
Add once again, but now add the numbers.
2.8x + 8.7
~ Hope this helps you!