Anyone ? i’ll mark you the brainiest

Of four points are collinear, they are also coplanar

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

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25