3 answers please help

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Find four solutions of the given function. write the solutions as ordered pairs. 4x – y = 4

The ages of personnel in the accounting department of a large company are normally distributed with a standard deviation of 7 years. there is a 0.02275 probability that the age of any randomly chosen person in the department is less than 22 and 0.15866 probabilty that the age of any randomly chosen person is greater than 43. what is the mean of this distribution?