The 3rd term of a GP us 16 and the 6th term is -128. Find the 1st term and the sum of the first seven terms​

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 the scale factor between two circles is 2x/5y what is the ratio of their areas?

How do i multiply two digit numbers