She uses 45 roses, 36 daisies, and 18 lilies. The reason is all of those fit the pattern used above and all of those are multiplied by the same number, making them equivalent
An = -15 + 9(n - 1), since the first term is 15 and for each consecutive term we are adding 9 to the previous term
First one sorry if it wrong
Try, please, suggested decision.