If sec(a) = 25.2/19.4 then what is the value of cos(a)?

Which of the following graphs could represent a cubic function?

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.

How many square centimeters of wrapping paper will be used to wrap the shoe box?