B. <span>sometimes
is the right answer
</span> <span>Any two angles which add up to 90 degrees are complementary.</span>
The shape of the room is not a square.
Pythagorean Theorem: 17^2+17^2= 578, square root 578 and you'll get 24.04.
The length of the diagonal of the floor of the room in the plan should have been 24.04 in order to be a square.
YOU CANNOT ADD OR SUBTRACT FRACTIONS WITH DIFFERENT DENOMINATORS!! You need to find the LCD (Lowest Common Denominator) for 6 and 2 with is 6!!
(CORRECTED WORK SHOWN BELOW)
A) "Dear Sir or Madam:"
That requires a comma, not a colon.