30 times 86 equals 2580 and 4 times 86 equals 344 add those together and you get 2924
The answer would be your last option, D, 168 cm sq
Hope this helped!
Less because if you look in the hundredth place 4 is > than 3
The answer is 360 because if u do this 20×36 and the 1/2 it u get this 360 20×36 is 720 and then 2÷720 u get 360