The answer is B: 6 cm. You can use guess-and-check method, and plug the possible different answers into the equation x(x+6)=72, x stands for the width.
Step-by-step explanation:
2(x+4) = 12
or, 2x + 8 = 12
or, 2x = 12-8
or, 2x = 4
or, x = 4÷2
hence, x = 2
Assuming you meant 45x^2y^2+18*3 , it should be 9(5x^2y^2+6)
400/100=4 so 4 workers are = to 1%
72×4=288 workers are part time
400-288=112 full time workers
