A plumber charges a one-time surcharge fee of $50 for emergency calls plus a rate of $65 per hour. Write a function using function notation to determine the total amount charged for an emergency service call. Then find f(4.5), and explain the real-world interpretation of f(4.5).

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?