Si alex hace su tarea en 8 horas, ¿cuanto hace en cada hora? ¿cuanto hace en dos horas?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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.

Find solution of the linear equation y = 2/3x + 1/3