What’s a Theometric six pack of three? I’m pretty sure I think I know what this is but I’m confusion

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Ialready asked this but i never got an answer. will give a high rating and perhaps brainliest. choose the linear inequality that describes the graph. the gray area represents the shaded region. y ≤ –4x – 2 y > –4x – 2 y ≥ –4x – 2 y < 4x – 2

What is the sum of these mixed numbers 4 2/3+ 3 1/9