if you are 5'10" and weigh 129lb, you certainly do not want to lose any weight, if anything put a few lbs on!
3,500 calories.
It takes 3500 calories to lose a pound
depending on your weight you will burn more or less calories, but a male weighing about 150pounds should burn around 600-800 calories.
alot... alot...
same amount you burn.
You can't lose weight by guessing. You will need to know how many calories you need per day by the amount of exercise you do. The average person burns 2000 calories per day. In order to maintain homeostasis within the body, your intake of calories should match how many calories you burn.
eating the same amount of calories that you burn in a day will make your weight stay the same, to lose weight burn more calories then you eat and to gain weight eat more calories then you burn
well, it depends on your calorie intake per day. Basically how many calories you consume a day. If you burn more calories than you consume you will lose weight.
It doesn't matter how many calories you burn - if you burn more each day in exercise than you consume each day in food, you'll lose weight. But if you're a big eater, you could work out 20 hours a day and not lose weight.
cardio gets rid of more calories, weight lifting defines and builds muscle. it only slightly gets rid of calories.
To maintain your weight... eat as many calories as you burn. Most humans, without even excercising, burn 1500-2000 calories a day just doing daily things and...surprise, surprise, living! If you are trying to lose weight, you have to eat a significant less amount of calories than you are planning to burn in a day. So, if you plan to go on a 3 mile run, and burn a total of 2300 calories in one day, to lose weight you have to eat less than 2300 calories. AND gaining weight is just the opposite...eat more calories than you burn.
It doesn't really matter your age. Take your ideal weight ie 140 lbs. Times that by 100 =1,400. You should be consuming 1,400 calories per day to reach your ideal weight of 140. Or you can eat 1,500 and excersize to burn that extra 100 calories or eat 1,600 and burn 200 calories with excersize.