Let f f be the function defined by f ( x ) = cos ⁡ ( π 2 x ) . f(x)=cos( 2 π x). What is the average value of f f on the interval [ 1 3 , 7 3 ] [ 3 1 , 3 7 ] written in simplest form?

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.