What is the Pearson's correlation coefficient for X and Z? (Rxz)

An economist is interested in studying the relationship between length of unemployment and job seeking activity among white-collar workers. He interviews a sample of 12 unemployed accountants about the number of weeks they have been unemployed (X) and the number of weeks they have been seeking a job during the past year (). In addition to job-seeking activity, the researcher collected the age of all respondents (Z)