How many solutions does the following equation have? -3x + 9 - 2x = -12 - 5x

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

This is about circle theorems. someone asap : (