Whats 1/99.100 - 1/99.98 - 1/98.97 - ... - 1/2.1

The graph below could be the graph of which exponential function?

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year