Evaluate the piecewise function below for f(3): f(x) = { 2x - 9 if x < = 3 4-x if x > 3 write your answer as a single number

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?

Can someone pls ! pls answer all. no explanation needed..

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl