How to do these questions I don't know how to do?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

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