In a direct variation, y = 18 when x = 3. Write a direct variation equation that shows the relationship between x and y.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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

What percent of 18 is 24? and plz explain thx.