The correct multiplicative inverse is -1/54.
No. 54 cm = 540 mm
33+21=54
Slightly less than five and a half
Multiply 54 times 54, then move the decimal over two times, as there are 2 digits in the "tenths" place.
no 54 cm = 540 mm1 cm = 10 mm1 mm = 0.1 cm