Evaluate and simplify the expression
when a = 4 and b = -1.

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Math it's appreciated. (picture provided)

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.