A= 1/2bh, for b basically i have to rewrite the equation so b= something but i don’t know how to get it

Can someone tell me if this is perpendicular? !

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.

Which equation represents h for right triangle abc