Find the directional derivative of f(x, y)=x2y3+2x4y at the point (1,5) in the direction θ=π/3. the gradient of f is:

Afootball is throw by a quarterback to a receiver

What is the radical expression that is equivalent to the expression 27 1 over 5?

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day