Right angle=90°.
(X-20) + X = 90.
Then solve for X.
X=55
Firstly, expand the equation.

Next, move the variable x to the left and all the constant to the right.

Then, solve for x.
I'm pretty sure the answer is G. I'm not 100% sure tho. Hope this helps! :)
The tip would be $2.80 because it is 20% of the $14 meal
For this case we must simplify the following expression:
We eliminate the parentheses taking into account that:

So:

We add similar terms taking into account that:
Equal signs are added and the same sign is placed.
Different signs are subtracted and the major sign is placed.

Answer:
