This question confused me a lot help?? trigonometry

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?