6 times a number n is 6n.
In algebra, when number multiply with variables, you don't need a multiplication sign (x). You just put them together like 6n (instead of 6 x n).
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If your turn 3/5 into 6/10 it becomes easier to turn into a decimal or a percentage.
3/5 = 0.60 = 60%
Side length in centimeters is
A) 130 cm