Answer
Rosa has 45 stickers.
Step-by-step explanation
Anna is said to have 15 stickers.
Rosa is said to have 3 times as many stickers as Anna.
Rosa's stickers = 3 × 15 = 45 stickers.
Dawn has 3 times as many stickers as Rosa.
Dawn's stickers = 3 × 45 = 135 stickers.
Sara has 17 fewer stickers as Dawn.
Sara's stickers = 135 - 17 = 118 stickers.
Hope this Helps!!!