The answer to your question would be
Height=5cm+
(18cm)*(y)
~Hello There!~
Product means they multiply to make 6
Think of numbers that multiply to make six:
1 x 6
6 x 1
3 x 2
2 x 3
The largest out of those is clearly 6 x 1 which makes 61
Hope This Helps You!
Good Luck :)
Have A Great Day ^_^
- Hannah ❤
Opposite operation of multiplication = division.

Simply divide 65 by 5.45