A restaurant hostess is paid $50 plus 10% of the waitstaff’s tips for each night she works. If y represents her pay each night and x represents the waitstaff’s tips, which equation models this relationship?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

I’m really confused and need to learn this