Which statement about rational numbers is NOT correct? Group of answer choices a. All rational numbers are also integers. b. Zero is a rational number. c. All integers also rational numbers. d. All rational numbers can be written in the form a/b

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