Travel 400 miles with 15 gallons how many with 6 gallons

The table above shows approximate conversions from gallons to liters. what is the value of x?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Precalculus question, image attached.