How do u figure out complex fractions and unit rates

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

What is the anwers for 9+2x=5x-3-x

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