Am I correct and do I write a=-2 or negative,2 will be better​

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220