What is the explicit rule for the sequence?

10.5, 9, 7.5, 6, 4.5, 3, ...

an=12−1.5n

an=11−1.5n

an=12.5−1.5n

an=12+1.5n

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

When you answer this can you explain

What is x3+3x2−16x−48 divided by x−1?