Please write Null hypothesis and hypothesis1

I - O 1. If I replace the battery in my car, then my car will get better gas mileage. 2. If I eat more vegetables, then I will lose weight faster. 3. If I add fertilizer to my garden, then my plants will grow faster. 4. If I brush my teeth every day, then I will not develop cavities. 5. If I take my vitamins every day, then I will not feel tired. 6. If 50 mL of water are added to my plants each day and they grow, then adding 100 mL of water each day will make them grow even more