Keith has $400. andrew has 3/4 as much as keith. if andrew gives 15% to kevin how much does he have

Solve for x, y, and z. show all steps.

Which matrix multiplication is possible?

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