3x + 5
Just combine like terms. The like terms are 2x and x. You can also write x as 1x. The sign is addition so you at 2x + 1x and get 3x. So now you have 3x + 5,you can’t add 3x + 5 cause they aren’t like terms so that’s your answer. :)
For starters, 700 and 600 are different
That's correct. Now you gotta plug in -5 in for x and get both angles.
The square root is

Just square the top and bottom of the fraction.

and

so we have 12/16 and then we reduce to 3/4
both the surface areas of the green and blue figures?