Urgent! need someone to properly calculate for degrees because my calculator doesn't give right answer for some reason!

tan^-1 (2.3/1.4) = # degrees ( is not 1.02)

tan^-1 (17/39.8) = # degrees ( is not .40)

tan^-1 (4.3/15.1) = # degrees ( is not .27)

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18