277,200 is the one that it can round up to 277,300 and the least number too
Its true you are doing it to both side. If you only one side, then the inequality would not be true. Subtract is like adding the negative . number, so you still would have to do it to both side of the inequality so the inequality is true,
I'm not quite sure how you got your answer, but the answer to c is 57 tiles.
First we can find the area of a singular tile by multiplying 12 and 12 together to get 144 in².
Then we find the area of the kitchen floor by splitting it into two rectangles, finding those areas, and adding them. This gives us (108 × 60) + (48 × 36) = 6,480 + 1,728 = 8,208 in².
Then to find how many tiles fit, we need to divide the total area, 8,208 in², by the area of a singular tile, 144 in², which results in 57 tiles.
I hope this helps!