What is the first quartile, q1, of the data set?

{23, 28, 28, 36, 56, 60, 61, 65, 70}

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?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

How to solve a simultaneous equation involved with fractions?