Please help me asap.

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?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9