The mean length of a set of ribbons is 30 inches the standard deviation is 11 inches describe the data that is within one standard deviation mean

Anyone know? will mark brainliest if you're correct!

Nine more than four times a number is the same as one less than twice the number. find the number?

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2