Answer:
Valuable; rare
Explanation:
In the airline industry, frequent flyer programs, ticket kiosks, and e-ticketing are all examples of capabilities that are ___ but no longer ___.
Divide 60/4 = 15
100/15 = 6.666 which rounds to 6.67 or that rounds to 6.7
Lower pitch and longer wave
1) B.Metallic windows
2) D. Absorption
3) A. Clear glass
