What is 2 times the difference between 49.5 and 37.5

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?

When only separate discreet points are graphed it is called?

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation