Can someone help me with this question please

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

When turned about its axis of rotation, which shape could have created this three-dimensional object?