If f(x)=(10/x)^3, what is the value of f(2)

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?