L8 When visiting Planet Xenon We noticed that the national inhabitants had a system of numeration identical in structure to ours except that they used only the digits 0, 1, 2, 3, 4, 5, 6 and 7.
a. How many fingers did they have on each hand?
b. How could they represent our 100 in their system?

please answer and show your thinking

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