I want to know if I did this correct
Answer:
60cm
Step-by-step explanation:
30 (8)+70 (4)+40 (2)=600mm
1mm=0. 1cm
600mm=0. 1 (600)cm
600mm=60cm
90 is not a square number because you cannot multiple two of the same number to get 90.
For example, 4 is a square number, because 2 x2 = 4
Likewise, 9 is a square number (3 x3), and 81 is a square number (9 x 9)