Concept:The result is obtained by adding the two numbers and then multiplying the sum by the first number.Explanation:For 3+2=15, we do (3+2)×3=5×3=15.For 4+3=28, we do (4+3)×4=7×4=28.Apply the same logic to 5+4: (5+4)×5=9×5=45.Answer:45 (Option A)