Answer:
3 nights
Explanation:
let n equal the number of nights
6 = 2n ---> 6 cm = 2 cm x the number of nights
6/2 = 2n/2 ---> divide both sides of the equation to isolate n
3 = n ---> number of nights equals 3
6 is the number of centimeters needed divided by 2 the number of centimeters per night which would give you the number of nights.