Which second degree polynomial function has a leading coefficient of -1 and root 4 with multiplicity 2?

Find the domain of the following expression: 1/(√x)-2

What is the lcm of 16 and 40 ? 24 and 40 ?

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