If x is 1.9 then the equation turns into: 2(1.9+9) so
1.9+9 = 10.9. Then since it was parentheses it will go back to: 2(10.9). If any number is in parentheses and doesn’t have a plus or minus sign in-front of it, then you multiply, So 2 times 10.9= 21.8.
Thus, If x= 1.9, Then 2(x+9)= 21.8.
Hope this helps!