Answer:
75. by angle sum property of an traingle
Answer:
9n + 15
Step-by-step explanation:5XN + 5X3 + 4N = 5n + 15 + 4n = 9n + 15
Answer:
4.2 × 
Step-by-step explanation:
2.1 ×
× 2 × 
2.1 + 2 = 4.2
2 - 3 = - 1
4.2 × 
B? If you need any help please ask me