Plz all 3 i'll give brainiest if right.!

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?

Solve the triangle. a = 21°, c = 105°, c = 5

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?