The first one is 10ab + 20
Answer:
7n-10
Step-by-step explanation:
=(5n-3) - (-2n) -7 [Bracket Opens]
=5n - 3 +2n -7 [- × - = +]
=7n - 10 [ addition]
(x² + 16)(x² - 16)
= (x²)² - 16²
= x⁴ - 256
Given the numbers above and those numbers only the mean would be 1.8