What is 3x3 i also ned a explaintion

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?

The interior angles formed by the sides of a hexagon have measures that sum to 720°. what is the measure of angle a? enter your answer in the box. m∠a= °

Evaluate f(x) when x= -9. f(x)= 16x® + 2 6 12 if 9 < x < 13 no solution 488 12