How do you find the answer for
3(5x+20)=45

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