Okay so I am doing things with polynomials and I am stuck on this question...

What expression is equivalent to 1/2(2+3x-6)

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?