What is 0.75 as a fraction in simplest form

Acircle has a circumference of 28.36 units what is the diameter of the circle

Can some one explain this i got sent this. is this a threat i’m scared

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