Answer:
A 173.16
Step-by-step explanation:
905.94 - 732.78 = 17316
12
Step-by-step explanation: Ryan played 12 songs because 9+3=12
$11.61
81x⁴ - 16y⁴
(9x²)² - (4y²)²
(9x² + 4y²)(9x² - 4y²)
(9x² + 4y²)(3x + 2y)(3x - 2y)