One number exceeds another by 12. the sum of the numbers is 40. what are the numbers?

What is the quotient? x+5/ 3x²+4x+5 © 3x2 – 11 + x + s 3x – 11 + 60 x + 5 o 3x2 - 11 - 50 x + 5 3x – 11 - - x + 5

I'm confused on this could anyone me and show me what i need to do to solve it.

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