The expression has 3 terms
The equation you would use is t+25=45 because he volunteered at the hospital for 45 minutes in total. To find T you would do 45-25 which equals 20 and 20 minutes is the amount of time he answered phone calls
The bookshelf will not fit because the angle of the bookshelf is too small, the angles of the pentagon add up to exactly 540 degrees so the bookshelf is off by 30 degrees
The second one is the right answer
The answer will be 17 & 8
