If t is 30 days and I'm solving for N where does the 5 go?

The learning curve for the number of units N produced per day after a new employee has worked f days is N 2 30(1 em}. The management requires a new employee to produce at least 5 units per day after 30 days on the job. (a) Find the learning curve that describes this minimum requirement. [b] Find the number of days before a minimal achiever is producing 10 units per day. {Round your answer to the nearest whole number.)